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  1. Ansatte

Språkvelger

English

Geir Johnsen

Last ned pressefoto
Last ned pressefoto
Foto:

Geir Johnsen

Professor
Institutt for biologi

geir.johnsen@ntnu.no
73591581 91897027 Biologisk stasjon, 01.nov, Trondheim, Bynesveien 46
Om Publikasjoner Undervisning Formidling

Om

CV

Geir Johnsen is a professor in marine biology at the Department of Biology (NTNU at Trondhjem biological station, TBS), Prof II at University Centre on Svalbard (UNIS), and is one of the founding partners in a NTNU spin-off company Ecotone using new optical techniques for mapping and monitoring the marine environment. He is a key scientist in the Centre of excellence (CeO) "Autonomous Marine Operations and Systems (AMOS) using enabling technology for marine ecological studies.

He has been at 1 years research stays at University of California at Santa Barbara (1992-93) , Curtin University, Perth, Australia (2010-11) and University of Hawaii at Manoa, Honolulu (2018-19). 

Adviser for 48 MSc and 17 PhD students graduated. Currently he advises 7 PhD candidates and 2 post docs. He have published >140 papers in international scientific journals and been a co-editor for the books "Ecosystem Barents Sea" (Tapir Academic Press, 2009), Phytoplankton pigments: Updates on Characterization, Chemotaxonomy and Applications in Oceanography (Cambridge University Press, 2011) and “Life and Light in the Dead of Night” (Springer-Nature, published end of March 2020).

Research areas

  • Marine ecology and biodiversity in temperate, tropical and arctic regions
  • Bio-optics
  • Photosynthesis and eco-physiology in phytoplankton, ice algae and macroalgae
  • Pigment chemotaxonomy, light harvesting and photo-protective function
  • Underwater robotics and sensor development for in situ identification of organisms
  • Mapping and monitoring of bio-geo-chemical objects of interest in the marine environment
  • Polar night marine ecology
  • Photo-biology - Light as a cue of light


 

Publikasjoner

  • Kronologisk
  • Etter kategori
  • Se alle publikasjoner i Cristin

2026

  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Ødegård, Øyvind; Ingulstad, Mats; Thun, Terje. (2026) Historien om et tre (og dets innbyggere). framsenteret.no
    Kronikk

2025

  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Sneli, Jon-Arne; Ødegård, Øyvind; Ingulstad, Mats. (2025) Exploring Climate Change, Geopolitics, Marine Archeology, and Ecology in the Arctic Ocean Through Wood-Boring Bivalves. Oceanography
    Vitenskapelig artikkel
  • Neves, Luiza S.; Smeby, Kristin Sagosen; Broch, Ole Jacob; Johnsen, Geir; Ardelan, Murat van; Skjermo, Jorunn. (2025) Particulate and dissolved organic carbon losses in high latitude seaweed farms. Science of the Total Environment
    Vitenskapelig artikkel

2024

  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Villedende om hypotetiske havbunnsmineraler?. Dagens næringsliv
    Leserinnlegg
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Norge mangler kunnskap om gruvedrift i dyphavet. Gemini (English edition)
    Kronikk
  • Førde, Hedda; Grant, Stephen Denis; Viljanen, Martta; Majaneva, Sanna Kristiina; Johnsen, Geir. (2024) Glow and Know – Evaluating the Potential of Spectral Bioluminescence as a Tool for Zooplankton Identification in situ. NTNU
    Mastergradsoppgave
  • Viljanen, Martta; Førde, Hedda; Majaneva, Sanna Kristiina; Grant, Stephen Denis; Johnsen, Geir. (2024) Zooplankton spectral bioluminescence database.
    Database
  • Five, Taran; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2024) Studying Behavioral Responses to Bioluminescence in Zooplankton. NTNU
    Mastergradsoppgave
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Hagspiel, Verena; Johnsen, Geir. (2024) Feil på feil om gruvedrift på havbunnen - Stortingsmeldingen om gruvedrift på havbunnen holder ikke vann. Dagens næringsliv
    Kronikk
  • Ingulstad, Mats; Bakken, Torkild; Johnsen, Geir; Ellefmo, Steinar Løve; Hagspiel, Verena. (2024) Norway needs to know much more before actually mining the deep sea. Norwegian SciTech News
    Kronikk
  • Berge, Jørgen; Johnsen, Geir; Last, Kim; Cohen, Jonathan H.; McKee, David. (2024) Light in polar regions. Orkana Forlag
    Faglig kapittel
  • Overrein, Martin Molberg; Tinn, Phil; Aldridge, David; Johnsen, Geir; Moreira Fragoso, Glaucia. (2024) Biomass estimations of cultivated kelp using underwater RGB images from a mini-ROV and computer vision approaches. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Schartmüller, Bernhard; Mckee, David; Berge, Jørgen; Johnsen, Geir. (2024) Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration. Applied Optics
    Vitenskapelig artikkel
  • Faltynkova, Andrea; Deschenes, Catherine; Zolich, Artur; Wagner, Martin; Johansen, Tor Arne; Johnsen, Geir. (2024) Use of an uncrewed surface vehicle and near infrared hyperspectral imaging for sampling and analysis of aquatic microplastics. Marine Pollution Bulletin
    Vitenskapelig artikkel
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics From Mid-Norway Using Multiple Observational Platforms. Journal of Geophysical Research (JGR): Oceans
    Vitenskapelig artikkel
  • Liu, Hongbo; Summers, Natalie Maria; Chen, Yi-Chun; Løvås, Håvard Snefjellå; Johnsen, Geir; Koestner, Daniel Warren. (2024) Pixelwise immersion factor calibration for underwater hyperspectral imaging instruments. Optics Express
    Vitenskapelig artikkel
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics Captured by an Autonomous Uncrewed Surface Vehicle. Earth and Space Science
    Vitenskapelig artikkel
  • Mo-Bjørkelund, Tore; Majaneva, Sanna Kristiina; Moreira Fragoso, Glaucia; Johnsen, Geir; Ludvigsen, Martin. (2024) Multi-vehicle adaptive 3D mapping for targeted ocean sampling. PLOS ONE
    Vitenskapelig artikkel

2023

  • Bakken, Sivert; Luis, Kelly; Johnsen, Geir; Johansen, Tor Arne. (2023) Evaluating hyperspectral Secchi depth retrieval through hybrid modeling and regression. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Gemini.no
    Kronikk
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Forskning.no
    Kronikk
  • Deschenes, C; Zolich, Artur; Wagner, Martin; Johnsen, Geir; Johansen, Tor Arne; Faltynkova, Andrea. (2023) Unmanned vehicle and hyperspectral imager for a more rapid microplastics sampling and analysis. OCEANS
    Vitenskapelig artikkel
  • Oftedahl, Live; Sørensen, Asgeir Johan; Johnsen, Geir. (2023) NTNUs first research satellite on the first mission in the Arctic.
    Nettsider (opplysningsmateriale)
  • Nordahl, A; Dugstad, L; Magnussen, O; Bakken, JB; Johnsen, Geir. (2023) Laksegriseriet. Dagens næringsliv
    Intervju tidsskrift
  • Carson, Siri Granum; Jenssen, Munro, Bjoern; Johnsen, Geir; Mason, Arthur. (2023) En bærekraftig fremtid for Svalbard – er utvinning av dyphavsmineraler en del av svaret?. Svalbardposten
    Kronikk
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'ee' buoy deployed during MOSAiC in the Sea Ice Ridge Observatory area.
    Annet produkt
  • Svendsen, Thea; Majaneva, Sanna Kristiina; Majaneva, Markus; Båtnes, Anna Solvang; Johnsen, Geir. (2023) The usability of eDNA to identify and quantify zooplankton communities. NTNU
    Mastergradsoppgave
  • Krohn-Pettersen, Gitte; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Blinks in the dark - Detecting and characterizing flash kinetics of bioluminescence for in situ species recognition of zooplankton. NTNU
    Mastergradsoppgave
  • Summers, Natalie Maria; Moreira Fragoso, Glaucia; Johnsen, Geir. (2023) Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night. Scientific Reports
    Vitenskapelig artikkel
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Teknisk Ukeblad
    Kronikk
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Siversten, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Who should collect, manage and have access to data from the oceans?. sciencenorway.no
    Kronikk
  • oudijk, AE; Johansen, Tor Arne; Johnsen, Geir; Alver, Morten Omholt. (2023) Simulating Hyperspectral Datacubes for Ocean Color: A Foundation for Phytoplankton Recognition in Spectral Signatures. OCEANS
    Vitenskapelig artikkel
  • Schartmuller, Bernhard; Anderson, Philip; Mckee, David; Connan-McGinty, Stacey; Kopec, Tomasz Piotr; Daase, Malin Hildegard Elisabeth. (2023) Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters. Applied Optics
    Vitenskapelig artikkel
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'gg' buoy deployed during MOSAiC in the Monster Bay area.
    Annet produkt
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'hh' buoy deployed during MOSAiC in the Dark site Second Year Ice. .
    Annet produkt
  • Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Reigstad, Marit; Sundfjord, Arild; Bogstad, Bjarte; Chierici, Melissa. (2023) Still Arctic? — The changing Barents Sea. Elementa: Science of the Anthropocene
    Vitenskapelig oversiktsartikkel/review
  • Williamson, David Roddan; Moreira Fragoso, Glaucia; Majaneva, Sanna Kristiina; Dallolio, Alberto; Halvorsen, Daniel Ørnes; Hasler, Oliver Kevin. (2023) Monitoring Algal Blooms with Complementary Sensors on Multiple Spatial and Temporal Scales. Oceanography
    Vitenskapelig artikkel
  • Bakken, Sivert; Henriksen, Marie Bøe; Birkeland, Roger; Langer, Dennis David; Oudijk, Adriënne Esmeralda; Berg, Simen. (2023) HYPSO-1 CubeSat: First Images and In-Orbit Characterization. Remote Sensing
    Vitenskapelig artikkel
  • Grant, Stephen Denis; Johnsen, Geir; Mckee, David; Zolich, Artur Piotr; Cohen, Jonathan H.. (2023) Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic. Applied Optics
    Vitenskapelig artikkel

2022

  • Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Connan-McGinty, Stacey; Banas, Neil S.; Berge, Jørgen; Cottier, Finlo Robert; Grant, Stephen; Johnsen, Geir. (2022) Midnight Sun to Polar Night: A Model of Seasonal Light in the Barents Sea. Journal of Advances in Modeling Earth Systems
    Vitenskapelig artikkel
  • Søreng, Marte Opsahl; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad; Gryte, Kristoffer. (2022) Mapping of Zostera Habitat in the Sublittoral Zone using Underwater Hyperspectral Imaging and Unmanned Surface Vehicle. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Oudijk, Esmée; Hasler, Oliver Kevin; Øveraas, Henning; Marty, Sabine; Williamson, David Roddan; Svendsen, Torbjørn Karl. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole. (2022) Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling. PLOS ONE
    Vitenskapelig artikkel
  • Oftedahl, Live; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2022) Oppdrag Mjøsa får internasjonal oppmerksomhet.
    Nettsider (opplysningsmateriale)
  • Nøland, Annecken; Johnsen, Geir; Aberle-Malzahn, Nicole. (2022) Autonomous Underwater Vehicle (AUV) based study of zooplankton communities, using a silhouette camera and artificial intelligence. NTNU
    Mastergradsoppgave
  • Marnor, Camilla Mult; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Mapping distribution patterns of brittle stars using ROV-based imaging. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Bjerkvoll, Mikkel; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Aerial and underwater hyperspectral imagery for shallow benthic nature type mapping. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Larsen, Martin Kvisvik; Mogstad, Aksel Alstad. (2022) Use of different imaging systems for ROV-based mapping of complex benthic habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Johnsen, Geir; Aberle-Malzahn, Nicole; Fragoso, Glaucia; Thu, Maren. (2022) Phytoplankton Spring Bloom Mapping in Coastal Areas Using Autonomous Underwater Vehicle (AUV) and Optical Approaches. NTNU
    Mastergradsoppgave
  • Summers, Natalie; Johnsen, Geir; Mogstad, Aksel Alstad; Løvås, Håvard; Fragoso, Glaucia Moreira; Berge, Jørgen. (2022) Underwater Hyperspectral Imaging of Arctic Macroalgal Habitats during the Polar Night Using a Novel Mini-ROV-UHI Portable System. Remote Sensing
    Vitenskapelig artikkel
  • Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) The role of parapodia and lack of photoacclimation in kleptoplasts of the sacoglossan sea slug Plakobranchus ocellatus. Coral reefs
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Løvås, Håvard; Sture, Øystein; Johnsen, Geir; Ludvigsen, Martin. (2022) Remote Sensing of the Tautra Ridge: An Overview of the World’s Shallowest Cold-Water Coral Reefs. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Johnsen, Geir; de Luigi, Guendalina. (2022) SeaBee’s Otter surface drone used in Arctic fieldwork.
    Nettsider (opplysningsmateriale)

2021

  • Horni, K; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2021) Internasjonalt forskningsmiljø dykker i Mjøsa etter at Oppland Arbeiderblad skrev om forurensning. Oppland arbeiderblad
    Populærvitenskapelig artikkel
  • Ringvold, Halldis; Taite, Morag; Allcock, A. Louise; Vecchione, Michael; Péan, Michel; Sandulli, Roberto. (2021) In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca). Scientific Reports
    Vitenskapelig artikkel
  • Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2021) Analysis and Model Development of Direct Hyperspectral Chlorophyll-A Estimation for Remote Sensing Satellites. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Løvås, Håvard; Mogstad, Aksel Alstad; Sørensen, Asgeir Johan; Johnsen, Geir. (2021) A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging. IEEE Journal of Oceanic Engineering
    Vitenskapelig artikkel
  • Faltynkova, Andrea; Johnsen, Geir; Wagner, Martin. (2021) Hyperspectral imaging as an emerging tool to analyze microplastics: A systematic review and recommendations for future development. Microplastics and Nanoplastics
    Vitenskapelig oversiktsartikkel/review
  • Johnsen, Geir; Zolich, Artur; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan H.; Mckee, David. (2021) All-sky camera system providing high temporal resolution annual time series of irradiance in the arctic. Applied Optics
    Vitenskapelig artikkel
  • Geoffroy, Maxime; Langbehn, Tom Jasper; Priou, Pierre; Varpe, Øystein; Johnsen, Geir; Le Bris, Arnault. (2021) Pelagic organisms avoid white, blue, and red artificial light from scientific instruments. Scientific Reports
    Vitenskapelig artikkel
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer. .
    Annet produkt
  • Bazilchuk, Nancy Reney; Stahl, Annette; Johnsen, Geir; Saad, Aya; Thu, Maren; Nøland, Annecken. (2021) Sporhunden som lukter mikroalger. . Gemini.no
    Populærvitenskapelig artikkel
  • Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2021) Underwater hyperspectral imaging as a tool for benthic habitat mapping. Doktoravhandlinger ved NTNU (2021/271)
    Doktorgradsavhandling
  • Bazilchuk, Nancy Reney; Berge, Jørgen; Johnsen, Geir. (2021) Lysforurensning I Arktis kan ha ødelagt forskningsresultater. Gemini.no
    Populærvitenskapelig artikkel
  • Cardwell, CR; Berge, Jørgen; Johnsen, Geir. (2021) Arctic voyage shines light on some cold, hard truths. The Herald, UK
    Populærvitenskapelig artikkel
  • Ringvold, Halldis; Johnsen, Geir; Andersen, Tom. (2021) Studies on Echinodermata from the NE Atlantic Ocean - Spatial distribution and abundance of Asteroidea, including taxonomic and molecular studies on Crossaster and Henricia genera - Value-chain results, including test fishery, biology, market and nutritional analysis on Parastichopus tremulus (Holothuroidea) from the Norwegian coast. Doktoravhandlinger ved NTNU (2021-254)
    Doktorgradsavhandling
  • Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2021) “Into the dark” documentary by Mike Snyder following Jørgen Berge (UiT), Geir Johnsen (NTNU) and David McKee (Uni Strathclyde) during Polar Night marine ecology work. .
    Film
  • Cohen, Jonathan H.; Last, Kim; Charpentier, Corie L.; Cottier, Finlo; Daase, Malin; Hobbs, Laura. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biology
    Vitenskapelig artikkel
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2019).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2017).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2020).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2018).
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2018) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2019) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Photosynthetic active radiation (PAR) time series measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2017) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) .
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2020) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt

2020

  • Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.. (2020) Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth. Communications Biology
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Ødegård, Øyvind; Nornes, Stein Melvær; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan. (2020) Mapping the Historical Shipwreck Figaro in the High Arctic Using Underwater Sensor-Carrying Robots. Remote Sensing
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2020) • Polar Night Exhibitions in Russia 2020. Kaliningrad – World Ocean Museum.
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir. (2020) Polar Night exhibition in Karelia (Petrozavodsk, Russia): 03.03 – 03.04.2020 . Polar Night exhibition, Karelia (Petrozavodsk, Russia). March-April 2020
    Museumsutstilling
  • Gibbens, Sarah; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) As the Arctic warms, light pollution may pose a new treat to marine life. . National Geographic
    Intervju tidsskrift
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Polar night marine ecology - life and light in the dead of night. Springer Advances in Polar Ecology (0)
    Vitenskapelig antologi/Konferanseserie
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Introduction. Springer
    Innledning
  • Johnsen, Geir; Leu, Eva; Gradinger, Rolf. (2020) Marine Micro- and Macroalgae in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Ramirez-Llodra, Eva; Hilário, Ana; Paulsen, Emil; Costa, Carolina; Bakken, Torkild; Johnsen, Geir. (2020) Benthic Communities on the Mohn’s Treasure Mound: Implications for Management of Seabed Mining in the Arctic Mid-Ocean Ridge. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Johnsen, Geir; Zolich, Artur Piotr. (2020) Light in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Berge, Jørgen; Johnsen, Geir. (2020) Life and Light at the Dead of Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Mogstad, Aksel Alstad; Berge, Jørgen; Cohen, Jonathan H.. (2020) Operative Habitat Mapping and Monitoring in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Fragoso, Glaucia Moreira; Johnsen, Geir; Chauton, Matilde Skogen; Cottier, Finlo Robert; Ellingsen, Ingrid H.. (2020) Phytoplankton community succession and dynamics using optical approaches. Continental Shelf Research
    Vitenskapelig artikkel
  • Saad, Aya; Stahl, Annette; Våge, Andreas; Davies, Emlyn John; Nordam, Tor; Aberle-Malzahn, Nicole. (2020) Advancing Ocean Observation with an AI-driven Mobile Robotic Explorer. Oceanography
    Vitenskapelig artikkel

2019

  • Graham, Lisa Kristine Hernandez; Johnsen, Geir; Christensen-Dalsgaard, Signe. (2019) A pilot study assessing drones for mapping and monitoring of European shags. Institutt for biologi, NTNU
    Mastergradsoppgave
  • Mogstad, Aksel Alstad; Johnsen, Geir; Ludvigsen, Martin. (2019) Shallow-Water Habitat Mapping using Underwater Hyperspectral Imaging from an Unmanned Surface Vehicle: A Pilot Study. Remote Sensing
    Vitenskapelig artikkel
  • Pavlov, Alexey K.; Leu, Eva; Hanelt, Dieter; Bartsch, Inka; Karsten, Ulf; Hudson, Stephen. (2019) The Underwater Light Climate in Kongsfjorden and Its Ecological Implications. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Bazilchuk, Nancy Reney; Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Ludvigsen, Martin; Johnsen, Geir. (2019) Smart undervannsrobot leter etter plankton. Av N Bazilchuk. Forskning.no. Angående NTNU Entice prosjekt publisert i Science Robotics. Forskning.no
    Populærvitenskapelig artikkel
  • Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Davies, Emlyn John; Ullgren, Jenny; Mendes, Renato; Johnsen, Geir. (2019) Toward adaptive robotic sampling of phytoplankton in the coastal ocean. Science robotics
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Poulton, Alex James; Pratt, Nicola Jane; Johnsen, Geir; Purdie, Duncan Alastair. (2019) Trait-based analysis of subpolar North Atlantic phytoplankton and plastidic ciliate communities using automated flow cytometer. Limnology and Oceanography
    Vitenskapelig artikkel
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2019) Sea surface microlayer and elemental composition in phaeo-, chloro-, and rhodophytes in winter and spring. Journal of Phycology
    Vitenskapelig artikkel
  • Kauko, Hanna Maria; Pavlov, Alexey; Johnsen, Geir; Granskog, Mats; Peeken, Ilka; Assmy, Philipp. (2019) Photoacclimation state of an Arctic underice phytoplankton bloom. Journal of Geophysical Research (JGR): Oceans
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Chauton, Matilde Skogen; Fossum, Trygve Olav; Ludvigsen, Martin. (2019) Physical controls on phytoplankton size structure, photophysiology and suspended particles in a Norwegian biological hotspot. Progress in Oceanography
    Vitenskapelig artikkel

2018

  • Liefmann, Stephanie; Järnegren, Johanna; Johnsen, Geir; Murray, Fiona. (2018) Eco-physiological responses of cold-water soft corals to anthropogenic sedimentation and particle shape. Journal of Experimental Marine Biology and Ecology
    Vitenskapelig artikkel
  • Johnsen, Geir; Norli, Marit; Moline, Mark A.; Robbins, Ian; Quillfeldt, Cecilie von; Sørensen, Kai. (2018) The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. Polar Biology
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning truer livet i Arktis. Aftenposten Viten
    Kronikk
  • Ludvigsen, Martin; Berge, Jørgen; Geoffroy, Maxime; Cohen, Jonathan H.; De La Torre, Pedro R.; Nornes, Stein Melvær. (2018) Use of an autonomous surface vehicle reveals small-scale diel vertical migrations of zooplankton and susceptibility to light pollution under low solar irradiance. Science Advances
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Poulton, Alex J.; Yashayaev, Igor M.; Head, Erica J.H.; Johnsen, Geir; Purdie, Duncan A.. (2018) Diatom biogeography from the Labrador Sea revealed through a trait-based approach. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Dumke, Ines; Ludvigsen, Martin; Ellefmo, Steinar Løve; Søreide, Fredrik; Johnsen, Geir; Murton, Bramley J.. (2018) Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field. IEEE Transactions on Geoscience and Remote Sensing
    Vitenskapelig artikkel
  • Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin; Hansen, Roy Edgar; Maarleveld, Thijs. (2018) Towards Autonomous Operations and Systems in Marine Archaeology. Doktoravhandlinger ved NTNU (IMT-12)
    Doktorgradsavhandling
  • Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Langbehn, Tom; Cottier, Finlo Robert. (2018) Increased occurrence of the jellyfish Periphylla periphylla in the European high Arctic. Polar Biology
    Short communication
  • Nornes, Stein Melvær; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir; Schjølberg, Ingrid; Ånonsen, Kjetil Bergh. (2018) Guidance and Control of Marine Robotics for Ocean Mapping and Monitoring. Doktoravhandlinger ved NTNU (2018:202)
    Doktorgradsavhandling
  • Kauko, Hanna Maria; Olsen, Lasse Mork; Duarte, Pedro; Peeken, Ilka; Granskog, Mats A.; Johnsen, Geir. (2018) Algal colonization of young arctic sea ice in spring. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Dumke, Ines; Purser, Autun; Marcon, Yann; Nornes, Stein Melvær; Johnsen, Geir; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging as an in situ taxonomic tool for deep-sea megafauna. Scientific Reports
    Vitenskapelig artikkel
  • Fossum, Trygve Olav; Eidsvik, Jo; Ellingsen, Ingrid H.; Alver, Morten; Fragoso, Glaucia Moreira; Johnsen, Geir. (2018) Information-driven robotic sampling in the coastal ocean. Journal of Field Robotics (JFR)
    Vitenskapelig artikkel
  • Ødegård, Øyvind; Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging: a new tool for marine archaeology. Applied Optics
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning - enda en kilde til bekymring. Svalbardposten
    Kronikk
  • Dumke, Ines; Nornes, Stein Melvær; Purser, Autun; Marcon, Yann; Ludvigsen, Martin; Ellefmo, Steinar Løve. (2018) First hyperspectral imaging survey of the deep seafloor: High-resolution mapping of manganese nodules. Remote Sensing of Environment
    Vitenskapelig artikkel
  • Gabrielsen, Tove M.; Johnsen, Geir. (2018) Skogen på Svalbard. Svalbardposten
    Populærvitenskapelig artikkel
  • Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen. (2018) An ice-tethered buoy for fish and plankton research. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Strømsholm, Jørgen; Johnsen, Geir; Ludvigsen, Martin. (2018) Eyes beneath the surface - using a miniROV to reveal habitat and dietary choices of the European shag. NTNU MSc thesis
    Mastergradsoppgave
  • Kauko, Hanna Maria; Johnsen, Geir; Assmy, Phillipp. (2018) Light response and acclimation of macroalgae in a changing Arctic. Doktoravhandlinger ved NTNU (2018)
    Doktorgradsavhandling
  • Fjærtoft, Kaja Lønne; Bakken, Torkild; Johnsen, Geir; Ludvigsen, Martin. (2018) Macroalgal detritus: Physical variables and impacts on the benthic macrofaunal community. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave

2017

  • Berge, Jørgen; Johnsen, Geir. (2017) Kunnskapshull om livet i Arktis i mørketiden. Aftenposten Viten
    Kronikk
  • Paulsen, Emil; Bakken, Torkild; Ramirez-Llodra, Eva; Johnsen, Geir. (2017) Community structure and biodiversity of the benthic megafauna at the inactive hydrothermal site Mohn's Treasure, on the Mohn's Ridge, Arctic Mid-Ocean Ridge (AMOR) . Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Alvsvåg, Dora Marie; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Berge, Jørgen. (2017) Mapping of a seagrass habitat in Hopavågen, Sør-Trøndelag, with the use of an Autonomous Surface Vehicle combined with optical techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Berge, Jørgen; Johnsen, Geir. (2017) Superkommunisten. Svalbardposten
    Kronikk
  • Berge, Jørgen; Johnsen, Geir. (2017) Om bambus, spøkelseskreps og et Arktis i endring. Svalbardposten
    Kronikk
  • Assmy, Philipp; Fernández-Méndez, Mar; Duarte, Pedro; Meyer, Amelie; Randelhoff, Achim; Mundy, Christopher John. (2017) Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ic. Scientific Reports
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Johnsen, Geir. (2017) Spectral characteristics of coralline algae: a multi-instrumental approach, with emphasis on underwater hyperspectral imaging. Applied Optics
    Vitenskapelig artikkel
  • Kamilla, Sporsheim; Sporsheim, Kamilla; Johnsen, Geir; Reitan, Kjell Inge; Evertsen, Antii Jussi. (2017) Astaxanthin as a biomarker for fish feed loading in the marine ecosystem. NTNU, Trondheim
    Mastergradsoppgave
  • Otterlei, Inger; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Hareide, Nils Roar; Christensen-Dalsgaard, Signe. (2017) 300 000 sjøfugl er forsvunnet fra Runde. Sunnmørsposten
    Intervju tidsskrift
  • Berge, Jørgen; Johnsen, Geir; Tandberg, Anne helene. (2017) Polar night - Life and light in the dead of night. Russian Science Week - Lomonosov Moscow State University
    Museumsutstilling
  • Johnsen, Geir; Sandbu, Marthe; Assmy, Philipp. (2017) High Arctic Sea-Ice Algae: The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities. Master science NTNU
    Mastergradsoppgave
  • Kjeken, John; Johnsen, Geir; Ludvigsen, Martin; Thorsnes, Terje; Lågstad, Petter Arthur. (2017) The growth of benthic organisms in a dumping ground for military bombs and munitions. NTNU, Trondheim
    Mastergradsoppgave
  • Mynors, Julie; Johnsen, Geir; Wernand, Marcel; Volent, Zsolt. (2017) Ocean Colour and Phytoplankton Dynamics - An examination of the Forel-Ule scale in a modern context. NTNU Trondheim
    Mastergradsoppgave
  • Johnsen, Geir; Christiansen, Hanne H; Ravolainen, Virve; Reymert, Per Kyrre; Jenssen, Eva Therese; Arlov, Thor Bjørn. (2017) Utfordrende natur og sikkerhet på Svalbard. Svalbardposten
    Kronikk
  • Kauko, Hanna Maria; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey K.; Mundy, C.J.; Duarte, Pedro. (2017) Windows in Arctic sea ice: light transmission and ice algae in a refrozen lead. Journal of Geophysical Research (JGR): Biogeosciences
    Vitenskapelig artikkel
  • Andersson, Ingvild Henriette Kristin; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin. (2017) Bio-optical diversity on cold water coral habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Ostaszewska, Kaja; Balazy, Piotr; Berge, Jørgen; Johnsen, Geir; Staven, Robert. (2017) Seabirds during Arctic Polar Night: underwater observations from Svalbard archipelago, Norway. Waterbirds (De Leon Springs, Fla.)
    Vitenskapelig artikkel

2016

  • Johnsen, Geir. (2016) Yrende liv i Isfjorden. Svalbardposten
    Populærvitenskapelig artikkel
  • Bjørgan, Espen Halvorsen; Johnsen, Geir; Kjeken, Jon; Ludvigsen, Martin. (2016) Fant buss på 600 m dybde. Adresseavisen
    Populærvitenskapelig artikkel
  • Aarskog, Karine Nigar; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2016) Et stort løft for arktisk forskning (NTNU & UiT). Universitetet i Tromsø
    Fagartikkel
  • Berge, Jørgen; Falk-Petersen, Stig; Renaud, Paul E.; Daase, Malin; Geoffroy, Maxime; Johnsen, Geir. (2016) En reise mot Ultima Thule. Svalbardposten
    Populærvitenskapelig artikkel
  • Lervik, Frank; Johnsen, Geir; Ludvigsen, Martin; Kjeken, John. (2016) Det ligger flere busser der. Adresseavisen
    Populærvitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Ludvigsen, Martin; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Mørkets fyrster, varulver og Indiana Jones. Gemini
    Populærvitenskapelig artikkel
  • Haudemann-Andersen, Jørn; Lystad, M S; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Blå lys i det kalde dyp. NRK Trøndelag, Nyheter
    Populærvitenskapelig artikkel
  • Haugstad, Tor; Erdal, Ivar; Johnsen, Geir; Sørensen, Asgeir Johan; Fjærvik, Nils. (2016) Gründerne mener dette kameraet kan bli det nye ekkoloddet – Ecotone er kandidat til TU Tech Award. Teknisk Ukeblad
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Geoffroy, Maxime; Johnsen, Geir; Cottier, Finlo Robert; Bluhm, Bodil; Vogedes, Daniel Ludwig. (2016) Ice-tethered observational platforms in the Arctic Ocean pack ice. IFAC-PapersOnLine
    Vitenskapelig artikkel
  • Cronin, Heather; Cohen, Jonathan H.; Berge, Jørgen; Johnsen, Geir; Moline, Mark A.. (2016) Bioluminescence as an ecological factor during high Arctic polar night. Scientific Reports
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Mark spiser opp vrak på havbunnen. Fiskaren
    Populærvitenskapelig artikkel
  • Kokkegård, Hanne; Johnsen, Geir; Ludvigsen, Martin; Torre, Pedro De La. (2016) Vitenskab - Bomber fra 2 verdenskrig danner koralrev på 600 m dybde. Danmarks radio
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2016) Mørkets fyrster med påskrudd lys. Svalbardposten
    Populærvitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Leite, Stein Roar; Johnsen, Geir; Kjeken, John; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2016) Bomber og buss på havbunnen. Gemini
    Populærvitenskapelig artikkel
  • Haugstad, Tormod; Erdal, Ivar; Johnsen, Geir. (2016) Kameraet deres «kan bli det nye ekkoloddet». Nå er det norske selskapet i ferd med å lykkes. Teknisk Ukeblad
    Intervju tidsskrift
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) Opp fra polarnattens mørke. Aftenposten Viten
    Kronikk
  • Gätzschmann, Per; Hårsaker, Karstein; Johnsen, Geir; Leite, Stein Roar; Pedersen, Solbjørg; Sørumgård, Marit. (2016) Nye oppdagelser i polarnatta - video. Polarnatt
    Museumsutstilling
  • Donahue, Michelle; Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) The age of humans - living in the anthropocene - "Termites of the sea" found munching wood near Arctic shipwrecks. Smithsonian
    Populærvitenskapelig artikkel
  • Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Aas, Lars Martin Sandvik. (2016) The use of underwater hyperspectral imaging deployed on remotely operated vehicle – methods and applications. IFAC-PapersOnLine
    Vitenskapelig artikkel
  • Håpnes, Sverre Julian; Johnsen, Geir; Ludvigsen, Martin; Lågstad, Petter Arthur. (2016) Mapping of demersal fish and benthos by AUV equipped with optical and acoustic imagers at 600 m depth in Trondheimsfjorden. NTNU MSc
    Mastergradsoppgave
  • Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Sørumgård, Marit; Sandbakk, Elin; Johnsen, Tobias Kvendseth. (2016) Polarnatt/Polar Night - ny utstilling med nyheter fra 2015-2016. Polarnattsutstilling ved Vitenskapsmuseet NTNU
    Museumsutstilling
  • Bondø, Tor-Hartvig; Johnsen, Geir; Berge, Jørgen. (2016) Fant yrende liv i polarnatta. VG : Verdens gang
    Populærvitenskapelig artikkel
  • Kintisch, Eli; Berge, Jørgen; Last, Kim; Cohen, Jonathan; Johnsen, Geir. (2016) Voyage into darkness . Science
    Intervju tidsskrift
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Gemini (English edition)
    Intervju tidsskrift
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Kinderegg i polarnatten. Svalbardposten
    Kronikk
  • Krüger, Frida Jørstad; Johnsen, Geir; Kjeken, John; Ludvigsen, Martin. (2016) Gammel buss ble korallrev. NRK Viten
    Populærvitenskapelig artikkel
  • Liefmann, Stephanie; Johnsen, Geir; Järnegren, Johanna. (2016) Eco-physiological responses of cold-water corals to anthropogenic sedimentation and particle shape. NTNU Mastergrad
    Mastergradsoppgave
  • Berge, Jørgen; Renaud, Paul E.; Johnsen, Geir; Darnis, Gerald; Geoffroy, Maxime; Daase, Malin. (2016) I grenselandet (mellom Tull og Thule). Svalbardposten
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) A bitter-sweet symphony. Svalbardposten
    Kronikk
  • Berge, Jørgen; Johnsen, Geir; Ludvigsen, Martin; Cohen, Jonathan. (2016) Design for latskap - men med store muligheter. Svalbardposten
    Kronikk
  • Førde, Henny; Forbord, Silje; Handå, Aleksander; Fossberg, Julia; Arff, Johanne; Johnsen, Geir. (2016) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. Journal of Applied Phycology
    Vitenskapelig artikkel
  • Jakobsen, June; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Karlsen, Svein. (2016) The Tautra Cold-Water Coral Reef - Mapping and describing the biodiversity of a cold-water coral reef ecosystem in the Trondheimsfjord by use of multi-beam echo sounding and video mounted on a remotely operated vehicle. NTNU
    Mastergradsoppgave

2015

  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Sørensen, Asgeir Johan; Last, Kim; Falk-Petersen, Stig. (2015) Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton?. PLOS ONE
    Vitenskapelig artikkel
  • Berge, Jørgen; Renaud, Paul; Darnis, Gérald; Cottier, Finlo; Last, Kim; Gabrielsen, Tove M.. (2015) In the dark: a review of ecosystem processes during the Arctic polar night. Progress in Oceanography
    Vitenskapelig artikkel
  • Berge, Jørgen; Daase, Malin; Renaud, Paul; Ambrose, William G. Jr.; Darnis, Gérald; Last, Kim S. (2015) Unexpected levels of biological activity during the polar night offer new perspectives on a warming Arctic. Current Biology
    Vitenskapelig artikkel
  • Tandberg, Anne Helene S.; Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) POLARNATT - liv og lyst i mulm og mørke. Polarnatt - liv og lyst i mulm og mørke
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir. (2015) Polarnatt - Liv og lys i mulm og mørke Polar night - life and light in the dead of night. Utstilling på Polarmuseet i Tromsø
    Museumsutstilling
  • Aarekol, Lena; Johnsen, Geir; Berge, Jørgen. (2015) Polarnatt. Liv og lys i mulm og mørke Polarnighth. Life and death in dead of night. Utstilling
    Museumsutstilling
  • Nilssen, Ingunn; Dos Santos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral, Marcelo M.; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan; Nilssen, Ingunn. (2015) Enabling technology for Arctic research. Pan European Networks: Science and Techology Magazine
    Vitenskapelig oversiktsartikkel/review
  • Nilssen, Ingunn; Santos dos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral Montenegro, Marcelo; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Vitenskapelig artikkel
  • Rodriguez, Francisco; Garrido, J.L.; Sabrino, C; Johnsen, Geir; Riobo, P; Franco, J. (2015) Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environmental Microbiology
    Vitenskapelig artikkel
  • Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Nilssen, Ingunn; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Moline, Mark A.; Berge, Jørgen. (2015) Integrated environmental mapping and monitoring, a methodological approach to optimise knowledge gathering and sampling strategy. Marine Pollution Bulletin
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) Life and light in the dead of night. Museumsutstilling
    Museumsutstilling

2014

  • Hovland, Erlend Kjeldsberg; Hancke, Kasper; Alver, Morten; Drinkwater, Kennneth F.; Høkedal, Jo; Johnsen, Geir. (2014) Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea. Journal of Marine Systems
    Vitenskapelig artikkel
  • Hancke, Kasper; Hovland, Erlend Kjeldsberg; Volent, Zsolt; Pettersen, Ragnhild; Johnsen, Geir; Moline, Mark A.. (2014) Optical properties of CDOM across the Polar Front in the Barents Sea: Origin, distribution and significance. Journal of Marine Systems
    Vitenskapelig artikkel
  • Kjerstad, Ingrid; Johnsen, Geir; Sørensen, Asgeir Johan; Bakken, Torkild. (2014) Underwater Imaging and the effect of Inherent Optical Properties on image quality. NTNU
    Mastergradsoppgave
  • Hatlebakk, Maja; Johnsen, Geir; Søreide, Janne. (2014) Effect of lipids and fatty acid composition on success of reproduction in Calanus glacialis. NTNU
    Mastergradsoppgave
  • Valle, Kristin Collier; Johnsen, Geir; Bones, Atle M. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. NTNU
    Doktorgradsavhandling
  • Hallerud, Charlotte; Johnsen, Geir; Aamot, Inga. (2014) Pigment composition of macroalgae from a Norwegian kelp forest. NTNU
    Mastergradsoppgave
  • Lund, Lene; Johnsen, Geir; Bakken, Torkild; Gabrielsen, Tove. (2014) Morphological diversity in Laminaria digitata - different species or different phenotypes?. Norwegian University of Science and Technology, Department of Biology
    Mastergradsoppgave
  • Førde, Henny; Reitan, Kjell Inge; Johnsen, Geir. (2014) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. NTNU
    Mastergradsoppgave
  • Cohen, Jonathan; Cronin, Heather; Moline, Mark A.; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Are krill eyes useful in the high Arctic polar night?. Ocean Optics
    Sammendrag/abstract
  • Hansen, Ingrid; Pettersen, Ragnhild; Beuchel, Frank; Cochrane, Sabine; Frantzen, marianne; Ekehaug, Stefan. (2014) Underwater hyperspectral imaging (UHI) for environmental mapping and monitoring of seabed habitats. Ocean Optics
    Sammendrag/abstract
  • Aamot, Inga; Pokrzywinski, Kaytee; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2014) Light Climate and Status of the Photosynthetic Machinery in Macroalgae in the Polar Night. Ocean Optics
    Sammendrag/abstract
  • Nornes, Stein Melvær; Candeloro, Mauro; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Photomosaic camera as simultaneous data collector and navigation aid on unmanned underwater vehicles. Ocean Optics
    Sammendrag/abstract
  • Johnsen, Geir; Ekehaug, Stefan; Hansen, Ingrid; Sørensen, Asgeir Johan. (2014) The use of underwater hyperspectral imaging deployed on remotely operated vehicles to identify, map and monitor bio-geo-chemical objects of interest. Ocean Optics
    Sammendrag/abstract
  • Nilssen, Ingunn; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen; Nornes, Stein Melvær. (2014) Integrated environmental monitoring; a methodological approach to optimise knowledge gathering and sampling strategy. Ocean Optics
    Sammendrag/abstract
  • Berge, Jørgen; Cottier, Finlo; Varpe, Øystein; Renaud, Paul; Falk-Petersen, Stig; Kwasniewski, Sawomir. (2014) Arctic complexity: A case study on diel vertical migration of zooplankton. Journal of Plankton Research
    Vitenskapelig artikkel
  • Kvernvik, Ane Cecilie; Johnsen, Geir; Aamot, Inga. (2014) How lamina age influence photosynthetic response to light variations in Saccharina latissima. NTNU
    Mastergradsoppgave
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2014) Elemental composition in various marine brown, green and red macro algae with respect to season and tissue age. NTNU
    Mastergradsoppgave
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Glowing in the dark: Discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Vitenskapelig artikkel
  • Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2014) Managing data from multiple sensors in an interdisciplinary research cruise. Amsterdam University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Erratum to: Glowing in the dark: discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Errata
  • Valle, Kristin Collier; Nymark, Marianne; Aamot, Inga; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green, and red light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel
  • Pettersen, Ragnhild; Johnsen, Geir; Bruheim, Per; Andreassen, Trygve. (2014) Development of hyperspectral imaging as a bio-optical taxonomic tool for pigmented marine organisms. Organisms Diversity & Evolution
    Vitenskapelig artikkel
  • Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Lågstad, Petter Arthur; Ødegård, Øyvind. (2014) Scientific Operations Combining ROV and AUV in the Trondheim Fjord. Marine Technology Society journal
    Vitenskapelig artikkel
  • Eldevik, Tor; Reigstad, Marit; Falck, Eva; Gerland, Sebastian; Jentoft, Sissel; Johnsen, Geir. (2014) Arven efter Nansen. Forskningsplan for det sentrale og nordlige Barentshavet. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Valle, Kristin Collier. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. Doktoravhandlinger ved NTNU (74)
    Doktorgradsavhandling

2013

  • Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Ferreira, Ana Sofia; Johnsen, Geir. (2013) Dynamics regulating major trends in Barents Sea temperatures and subsequent effect on remotely sensed particulate inorganic carbon. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Winge, Per; Andresen, Kjersti; Johnsen, Geir. (2013) Molecular and photosynthetic responses to prolonged darkness and subsequent acclimation to re-illumination in the diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Falk-Pettersen, Stig. (2013) Mørkets hemmeligheter. Svalbardposten
    Populærvitenskapelig artikkel
  • Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Greenacre, Michael; Johnsen, Geir. (2013) Quantifying the light sensitivity of Calanus spp. during the polar night: potential for orchestrated migrations conducted by ambient light from the sun, moon, or aurora borealis. Polar Biology
    Vitenskapelig artikkel
  • Ingrid, Hansen; Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Optical Mapping of Cold-water Corals in Trondheimsfjorden and Svalbard. NTNU
    Mastergradsoppgave
  • Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan. (2013) The use of side scan and synthetic aperture sonar mounted on autonomous underwater vehicles for biological habitat mapping. MSc Thesis (2013)
    Mastergradsoppgave
  • Pettersen, Ragnhild; Johnsen, Geir. (2013) Identification of marine organisms using Chemotaxonomy and Hyperspectral imaging. Doktoravhandlinger ved NTNU (292)
    Doktorgradsavhandling
  • Båtnes, Anna Solvang; Johnsen, Geir. (2013) Light in the dark – the role of irradiance in the high Arctic marine ecosystem during polar night. Doktoravhandlinger ved NTNU (151)
    Doktorgradsavhandling
  • Johnsen, Geir; Volent, Zsolt; Dierssen, Heidi; Pettersen, Ragnhild; Ardelan, Murat Van; Søreide, Fredrik. (2013) Underwater hyperspectral imagery to create biogeochemical maps of seafloor properties. Woodhead Publishing Limited
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Ludvigsen, Martin; Johnsen, Geir; Lågstad, Petter Arthur; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Nymark, Marianne. (2013) Light responses in the marine diatom Phaeodactylum tricornutum. Doktoravhandlinger ved NTNU (378)
    Doktorgradsavhandling

2012

  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2012) Phytoplankton Pigments: Characterization, Chemotaxonomy and Applications in Oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2012)
    Vitenskapelig antologi/Konferanseserie
  • Elde, Anette; Pettersen, Ragnhild; Bruheim, Per; Järnegren, Johanna; Johnsen, Geir. (2012) Pigmentation and Spectral Absorbance Signatures in Deep-Water Corals from the Trondheimsfjord, Norway. Marine Drugs
    Vitenskapelig artikkel
  • Berge, Jørgen; Båtnes, Anna Solvang; Johnsen, Geir; Blackwell, Susan; Moline, Mark A.. (2012) Bioluminescence in the high Arctic during the polar night. Marine Biology
    Vitenskapelig artikkel
  • Bjørdalsbakke, Lise Kristin; Johnsen, Geir; Bakken, Torkild; Berge, Jørgen. (2012) Population structure, parasitism and prey preference in Sclerocrangon boreas and S. ferox, Svalbard. NTNU
    Hovedfagsoppgave
  • Fremstedal, Ane Sofia Viset; Bruheim, Per; Sletta, Håvard; Johnsen, Geir. (2012) Utvikling og optimalisering av protokoll for massespektrometrisk metabolsk profilering av adherente humane celler. NTNU Master theses
    Mastergradsoppgave
  • Belseth, Elen; Johnsen, Geir; Berge, Jørgen. (2012) Eco-physiology of the Arctic kelp Laminaria solidungula. NTNU Master thesis
    Mastergradsoppgave
  • Gabrielsen, Tove M; Quillfeldt, Cecilie von; Johnsen, Geir; Berge, Jørgen. (2012) Varm vinter, sen vår i fjorden. Svalbardposten
    Leserinnlegg
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Sakshaug, Egil; Folkestad, Are. (2012) Bio-optics and ecology in Emiliania huxleyi blooms: Field and remote sensing studies in Norwegian water. NTNU
    Doktorgradsavhandling

2011

  • Pettersen, Ragnhild; Johnsen, Geir; Berge, Jørgen; Hovland, Erlend Kjeldsberg. (2011) Phytoplankton chemotaxonomy in waters around the Svalbard archipelago reveals high amounts of Chl b and presence of gyroxanthin-diester. Polar Biology
    Vitenskapelig artikkel
  • Jouenne, Fabien; Eikrem, Wenche; Le Gall, F; Marie, Dominique; Johnsen, Geir; Vaulot, Daniel. (2011) Prasinoderma singularis sp. nov. (Prasinophyceae, Chlorophyta), a Solitary Coccoid Prasinophyte from the South-East Pacific Ocean. Protist
    Vitenskapelig artikkel
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Phytoplankton pigments : characterization, chemotaxonomy and applications in oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2011)
    Vitenskapelig antologi/Konferanseserie
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2011) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Vitenskapelig artikkel
  • Volent, Zsolt; Johnsen, Geir; Hovland, Erlend Kjeldsberg; Folkestad, Are; Olsen, Lasse Mork; Tangen, Karl. (2011) Improved monitoring of phytoplankton bloom dynamics in a Norwegian fjord by integrating satellite data, pigment analysis, and Ferrybox data with a coastal observation network. Journal of Applied Remote Sensing
    Vitenskapelig artikkel
  • Brunet, Christophe; Johnsen, Geir; Lavaud, Johan; Roy, Suzanne. (2011) Pigments and photoacclimation processes. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Bricaud, Annick; Nelson, Norman; Prézelin, Barbara; Bidigare, Robert. (2011) In vivo bio-optical properties of phytoplankton pigments. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Moline, Mark; Pettersson, Lasse H.; Pinckney, J. L.; Pozdnyakov, Dmitry; Egeland, Einar Skarstad. (2011) Optical monitoring of phytoplankton bloom pigment signatures. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Acknowledgements. Cambridge University Press
    Annet
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Preface. Cambridge University Press
    Forord
  • Llewellyn, Carole A.; Roy, Suzanne; Johnsen, Geir; Egeland, Einar Skarstad; Chauton, Matilde ; Hallegraeff, Gustaff. (2011) Perspectives on future directions. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Andersen, Hanne Kile; Johnsen, Geir; Bakken, Torkild. (2011) Gastropods Associated with Laminaria hyperborea and Saccorhiza polyschides in a Norwegian Kelp Forest: Comparison of Sampling and In Situ Imaging Techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave

2010

  • Aamot, Inga; Berge, Jørgen; Hancke, Kasper; Johnsen, Geir; Moline, Mark; Schofield, Oscar. (2010) NORUS - Technology Development for Marine Monitoring and Ocean Observation:An North America-Norway educational program. http://ipy-osc.no/abstract/
    Sammendrag/abstract
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2010) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Vitenskapelig artikkel
  • Johnsen, Geir; Søreide, Fredrik. (2010) Underwater hyperspectral imaging of marine mineral deposits. Underwater Mining meeting Institute (UMI)
    Sammendrag/abstract

2009

  • Evertsen, Jussi; Johnsen, Geir. (2009) In vivo and in vitro differences in chloroplast functionality in the two north Atlantic sacoglossans (Gastropoda, Opisthobranchia) Placida dendritica and Elysia viridis. Marine Biology
    Vitenskapelig artikkel
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2009) Microscopic hyperspectral imaging used as a bio-optical taxonomic tool for micro- and macroalgae. Applied Optics
    Vitenskapelig artikkel
  • Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne. (2009) Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters
    Vitenskapelig artikkel
  • Berge, Jørgen; Lønne, Ole Jørgen; Renaud, Paul; Johnsen, Geir; Gulliksen, Bjørn; Varpe, Øystein. (2009) Polartorsken - vil den bli utkonkurrert av sørlige fiskearter?. Svalbardposten
    Populærvitenskapelig artikkel
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Vitenskapelig antologi/Konferanseserie
  • Øye, Ane-Marte; Johnsen, Geir. (2009) Photobioreactor time-series of a simulated bloom of Emiliania huxleyi. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Johnsen, Geir; Nepstad, Ina. (2009) Cloning and characterisation of interleukin-6 and interleukin-11b in Atlantic halibut (Hippoglossus hippoglossus). NTNU, Institutt for biologi
    Mastergradsoppgave
  • Thoen, Hanne Halkinrud; Johnsen, Geir. (2009) Pigmentation in the Arctic deep-sea amphipods Eurythenes gryllus and Anonyx sp. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Elde, Anette Cecilie; Johnsen, Geir. (2009) Pigmentation in deep-water corals from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Mastergradsoppgave
  • von Quillfeldt, Cecilie H.; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • von Quillfeldt, Cecilie; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik E.. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Quillfeldt, C.v.; Hegseth, E.N.; Johnsen, Geir; Sakshaug, E.; Syvertsen, E.E.. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, E.; Johnsen, Geir; Volent, Z. (2009) Light. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Z; Sakshaug, E.; Sigernes, Fred; Pettersson, L.H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, E.; Johnsen, Geir; Kristiansen, Svein; Quillfeldt, C.v.; Rey, F.; Slagstad, D.. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir; Kristiansen, Svein; von Quillfeldt, Cecilie; Rey, Francisco; Slagstad, Dag. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Zsolt; Sakshaug, Egil; Sigernes, Fred; Pettersson, Lasse H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir; Volent, Z.. (2009) Light. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, E.; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Lærebok
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit M.. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Fagbok
  • Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Hancke, Kasper; Andresen, Kjersti. (2009) An integrated analysis of molecular acclimation to high light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel

2008

  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combined use of AUV and hyperspectral imaging to mapping sea-surface and macroalgae. Ocean Optics
    Sammendrag/abstract
  • Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Zotchev, Sergey. (2008) Actinomycetes from sediments in the Trondheim Fjord, Norway: Diversity and biological activity. Marine Drugs
    Vitenskapelig artikkel
  • Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2008) Rate of O2 production derived from pulse-amplitude-modulated fluorescence: Testing three biooptical approaches against measured O2-production rate. Journal of Phycology
    Vitenskapelig artikkel
  • Bakken, Torkild; Evertsen, Jussi; Johnsen, Geir. (2008) Vitenskapelig dykking - behov for endringer i forskriften. Dykkenytt : informasjonsorgan for dykkeindustrien
    Fagartikkel
  • Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, RN. (2008) Temperature effects on microalgal photosynthesis-light responses measured by O2 production, pulse-amplitude-modulated fluorescence, and C-14 assimilation. Journal of Phycology
    Vitenskapelig artikkel
  • Båtnes, Anna Solvang; Johnsen, Geir. (2008) Trophic interaction between little auks and their zooplankton prey in a high Arctic fjord based on lipid analyses. NTNU, Institutt for biologi
    Mastergradsoppgave

2007

  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS Meeting in Marine Arctic Climate
    Rapport
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2007) Kelp forest mapping by use of airborne hyperspectral imager. Journal of Applied Remote Sensing
    Vitenskapelig artikkel
  • Carlsen, BP; Johnsen, Geir; Berge, Jørgen; Kuklinski, P. (2007) Biodiversity patterns of macro-epifauna on different lamina parts of Laminaria digitata and Saccharina latissima collected during spring and summer 2004 in Kongsfjorden, Svalbard. Polar Biology
    Vitenskapelig artikkel
  • Cibic, Tamara; Blasutto, Oriana; Hancke, Kasper; Johnsen, Geir. (2007) Microphytobenthic species composition, pigment concentration, and primary production in sublittoral sediments of the Trondheimsfjord (Norway). Journal of Phycology
    Vitenskapelig artikkel
  • Ludvigsen, Martin; Sortland, Bjørn; Johnsen, Geir; Singh, Hanumant. (2007) Applications of Geo-Referenced Underwater Photo Mosaics in Marine Biology and Archaeology. Oceanography
    Vitenskapelig artikkel
  • Edvardsen, B; Eikrem, W; Shalchian-Tabrizi, K; Riisberg, I; Johnsen, Geir; Naustvoll, L. (2007) Verrucophora farcimen gen. et sp nov (Dictyochophyceae, Heterokonta) - A bloom-forming ichthyotoxic flagellate from the Skagerrak, Norway. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (2007) Biooptical characteristics of PSII and PSI in 33 species (13 pigment groups) of marine phytoplankton, and the relevance for pulse-amplitude-modulated and fast-repetition-rate fluorometry. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir. (2007) Arctic Life: Bridging ecosystem function using remote sensing technologies. Svalbard Science Forum
    Populærvitenskapelig artikkel
  • Hancke, Kasper; Johnsen, Geir. (2007) Photosynthetic responses as a function of light and temperature: Field and laboratory studies on marine microalgae. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Bio-optical properties and spectral attenuation of photosynthetically available radiation: relation to primary productivity and phytoplankton composition. In Proceedings from Arctic Frontiers: balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Berge, Jørgen; Schander, C; Pampanin, D.M.; Johnsen, Geir. (2007) The past, present and future of the Mytilus edulis population on Svalbard. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Stübner, Eike; Johnsen, Geir. (2007) Biogeographical distribution of temperate vs. Arctic benthic species around Svalbard. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Pettersen, Ragnhild; Johnsen, Geir. (2007) Phytoplankton systematics and pigmentation in the Arctic. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Hovland, Erlend Kjeldsberg; Sakshaug, Egil; Johnsen, Geir. (2007) Tracing Coccolithophorid Blooms in the Barents Sea Using MODIS Level-3 Imagery. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Elvestrand, Jostein; Johnsen, Geir; Sneli, Jon-Arne. (2007) Morphometry and patterns of growth in Acesta excavata (Bivalvia: Limidae) from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Kleiven, Mona; Johnsen, Geir. (2007) Pigmentation in Halocynthia pyriformis from Isfjorden, Spitsbergen. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Evertsen, Jussi; Burghardt, Ingo; Johnsen, Geir; Wägele, Heike. (2007) Retention of functional chloroplasts in some sacoglossans from the Indo-Pacific and Mediterranean. Marine Biology
    Vitenskapelig artikkel

2006

  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Leder
  • Roy, Suzanne; Egeland, Einar Skarstad; Johnsen, Geir; Llewellyn, Carole; Wright, Simon. (2006) Report of a Workshop on a Follow-Up Volume of the Book "Phytoplankton Pigments in Oceanography". Scientific Committee on Oceanic Research
    Rapport
  • Olsen, Lasse Mork; Öztürk, M.; Sakshaug, Egil; Johnsen, Geir. (2006) Photosynthesis-induced phosphate precipitation in seawater: ecological implications for phytoplankton. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Rodriguez, F; Chauton, Matilde Skogen; Johnsen, Geir; Andresen, Kjersti; Olsen, Lasse Mork; Zapata, M.. (2006) Photoacclimation in phytoplankton: implications for biomass estimates, pigment functionality and chemotaxonomy. Marine Biology
    Vitenskapelig artikkel
  • Johnsen, Geir. (2006) Warming Arctic sees return of blue mussels after 1000 years. National Geographic
    Populærvitenskapelig artikkel
  • Onstad, L; Evertsen, Jussi; Johnsen, Geir. (2006) Snegle på solceller. Gemini
    Populærvitenskapelig artikkel
  • Sylling, Guro; Thingstad, Per Gustav; Johnsen, Geir. (2006) Marin bunndyrfauna (Gastropoda, Bivalvia) - Konsekvenser av åpning av veifylling over Ramsarområdet Tautrasvaet. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Carlsen, Beth Paludan; Johnsen, Geir. (2006) Makroepifauna associeret med Laminaria digitata og L. saccharina, Svalbard. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag; Pampanin, Daniella. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Vitenskapelig artikkel

2005

  • Burghardt, Ingo; Evertsen, Jussi; Johnsen, Geir; Wägele, Heike. (2005) Solar powered seaslugs - Mutualistic symbiosis of aeolid nudibranchia (Mollusca, Gastropoda, Opisthobranchia) with Symbiodinium. Symbiosis
    Vitenskapelig artikkel
  • Fossmark, Reidar; Johnsen, Geir; Waldum, Helge; Johannesen, Eli Marie. (2005) Rebound acid hypersecretion after long-term inhibition of gastric acid secretion. Alimentary Pharmacology and Therapeutics
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2005) Ocean temperature oscillations enable reappearance of blue mussels Mytilus edulis in Svalbard after 1000 year absence. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “Forskning og foto under vann”. NEWTON websider (NRK)
    Populærvitenskapelig artikkel
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “En glupsk nellik”. NEWTON websider (NRK)
    Populærvitenskapelig artikkel
  • Indergaard, M; Nordtvedt, M; Johnsen, Geir. (2005) Satellittmålinger for miljøet (SISCAL project, NTNU, IBI). Gemini
    Populærvitenskapelig artikkel
  • Hilstad, Kari; Johnsen, Geir. (2005) In situ tidsseriemålinger av lyshøstingsegenskaper og cellekjemi hos marine makroalger i Trondheimsfjorden. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Olsen, Lasse Mork; Johnsen, Geir. (2005) Interactions between marine osmo- and phagotrophs in different physicochemical environments. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Valle, Kristin Collier; Johnsen, Geir. (2005) Detection of monthly variation in marine red, brown and green macroalgae by means of in situ video, epifluorescence microscopy and numerical digital image analysis. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (2005) Nuclear Magnetic Resonance spectroscopy of marine microalgae: Metabolic profiling and species discrimination from High-resolution Magic Angle Spinning NMR analysis of whole-cell samples. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Sakshaug, Egil; Johnsen, Geir. (2005) Absorption, fluorescence excitation and photoacclimation in phytoplankton. Multi-Science Publishing
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir. (2005) Algal cultures, Analogues of Blooms and Applications. Multi-Science Publishing Multi-Science Publishing
    Vitenskapelig antologi/Konferanseserie
  • Berge, J; Johnsen, Geir; Nilsen, F; Gulliksen, B; Slagstad, D. (2005) Ocean temperature oscillations causes the reappearance of blue mussels in Svalbard after 1000 years of absence. Marine Ecology Progress Series
    Vitenskapelig artikkel

2004

  • Chauton, Matilde Skogen; Tilstone, Gavin; Legrand, Catherine; Johnsen, Geir. (2004) Changes in pigmentation, bio-optical characteristics and photophysiology, during phytoflagellate succession in mesocosms. Journal of Plankton Research
    Vitenskapelig artikkel
  • Hancke, Torunn Beate; Johnsen, Geir. (2004) SISCAL processor evaluation document. www.siscal.net
    Rapport

2003

  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL End User Requirement evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Vitenskapelig artikkel
  • Figueroa, F. L.; Escassi, L.; Perez-Rodriguez, E.; Korbee, N.; Johnsen, Geir. (2003) Effects of the irradiance in the short-term on accumulation of mycosporine like amino acids in sun and shade species of the red algal genus Porphyra. Photochemistry and Photobiology
    Vitenskapelig artikkel
  • Chauton, Matilde Skogen; Optun, Odd Inge; Bathen, F. T; Volent, Z.; Gribbestad, Ingrid S.; Johnsen, Geir. (2003) HR MAS 1H NMR spectroscopy analysis of whole cells of marine microalgae. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Vitenskapelig artikkel

2002

  • Gileptis, Laura; Johnsen, Geir; Moxness, Helge; Norwich, Inger; Vangen, Steffen. (2002) Modul for mønstergjenkjenning/klassifisering i DynamicImager ved bruk av backpropagation-algoritmen. Piksel'n : Organ for NOBIM (Norsk forening for bildebehandling og mønstergjenkjenning)
    Vitenskapelig artikkel
  • Millie, David; Schofield, Oscar; Kirkpatrick, Gary J.; Johnsen, Geir; Evens, Tim J.. (2002) Using absorbance and fluorescence spectra to discriminate microalgae. European journal of phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Børsheim, Knut Yngve; Johansen, Torunn Beate. (2002) Production and mortality of phytoplankton and sea-ice microalgae in the southern ocean. Rapportserie (Norsk polarinstitutt)
    Vitenskapelig artikkel
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User requirement evaluation document. [Mangler utgivernavn]
    Rapport
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User Requirements document. [Mangler utgivernavn]
    Rapport

2001

  • Graneli, Edna; Legrand, Catherine; Carlsson, Per; Johnsen, Geir; Maestrini, Serge Y.; Reichelt, Michael. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 20). Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment (summary paper). Phycologia
    Vitenskapelig artikkel
  • Legrand, Catherine; Johnsen, Geir; Graneli, Edna; Sakshaug, Egil. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 2000.) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Phycologia
    Vitenskapelig artikkel
  • Wägele, Heike; Johnsen, Geir. (2001) New results on histology and photosynthetic performance of solar-powered� opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) containing symbiotic chloroplasts or zooxanthellae. Organisms Diversity & Evolution
    Vitenskapelig artikkel
  • Legrand, Catherine; Johansson, Niclas; Johnsen, Geir; Børsheim, Knut Yngve; Graneli, Edna. (2001) Phagotrophy and toxicity in the photosynthetic Prymnesium patelliferum (Haptophyte). Limnology and Oceanography
    Vitenskapelig artikkel
  • Johnsen, Geir. (2001) SISCAL End User Requirement Satellite-based Information System on Coastal Areas and Lakes. Information Society Technologies Programme funded by the European Comm
    Rapport

1998

  • Seppala, J; Johnsen, Geir; Babichenko, S; Leeben, A; Poryvkina, L; Shalapyonok, [Mangler fornavn]. (1998) In vivo light absorption by photosynthetic and photoprotective algal pigments: Methodology and the effects of light acclimation and nutrient limitation. Report Series in Geophysics
    Vitenskapelig artikkel
  • Johnsen, Geir; Dalløkken, Runar; Aure, J; Skjoldal, H. R. (1998) Photophysiology and environmental conditions during a toxic bloom of Chrysochromulina leadbeateri (Prymnesiophyceae). International symposium on Harmful Algal Blooms
    Vitenskapelig artikkel
  • Johnsen, Geir; Eikrem, W.; Dalløkken, R.; Aure, J.; Skjoldal, H. R.. (1998) Physiology and environmental conditions during a toxic blooms of Chrysochromulina leadbeateri Prymnesiophyceae. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Samset, O.; Sakshaug, Egil. (1998) Bio-optical classification of potential harmful chlorophyll c -containing prymnesiophyte blooms in Scandinavian water.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

1997

  • Millie, D.; Schofield, O. M.; Kirkpatrick, G. J.; Johnsen, Geir; Tester, P. A.; Vinyard, B. T.. (1997) Phytoplankton pigments and absorption spectra as potential bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellat Gymnodinium breve. Limnology and Oceanography
    Vitenskapelig artikkel
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shading on the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Vitenskapelig artikkel
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shadingon the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Prezelin, B. B.; Jovine, R. V. M.. (1997) Fluorescence excitation spectra and light utiliation in two red tide dinoflagellates. Limnology and Oceanography
    Vitenskapelig artikkel
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

1996

  • Millie, D; Shofield, O. M; Kirkpatrick, G. J; Tester, P. A; Johnsen, Geir. (1996) Using bio-optical characterisics as bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellate,. EOS
    Vitenskapelig artikkel
  • Schofield, O.; Prezelin, B. B.; Johnsen, Geir. (1996) Wavelength-dependency of maximum quantum yield of carbon fixation for two red tide dinoflagellates, Heterocapsa pygmaea and prorocentrum minimum. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Volent, Z; Tangen, K; Sakshaug, Egil. (1996) Time-series of potential toxic phytoplankton blooms in North European waters in 1993 using the SEAWATCH-Europe buoy system. EOS
    Vitenskapelig artikkel
  • Vernet, M.; Mitchell, B.G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis cf. pouchetii blooms. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1996) Light harvesting in bloom-forming marine phytoplankton: Species-specifity and photoacclimation,. Scientia Marina
    Vitenskapelig artikkel
  • Vernet, M.; Mitchell, B. G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis sp. blooms. Marine Ecology Progress Series
    Vitenskapelig artikkel

1995

  • Jovine, R. V.; Johnsen, Geir; Prezelin, B. B.. (1995) Isolation of membrane bound chlorophyll a-chlorofhyll c binding light harvesting complexes from the dinoflagellates heterocapsa pygmaea and Prorocentrum minimum. Photosynthesis Research
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1995) Light harvesting in bloom-forming marine phytoplankton: species-specificity and photoadaption. Scientia Marina
    Vitenskapelig artikkel
  • Egeland, E.; Johnsen, Geir; Eikrem, W.; Liaaen-Jensen, S.; Throndsen, J.. (1995) The pigments of Bathycoccus prasinos. Journal of Phycology
    Vitenskapelig artikkel

1994

  • Jovine, R. V; Johnsen, Geir; Prezelin, B. B. (1994) Photoadaptation of Prorocentrum minimum and Heterocapsa pygmaea (Dinoflagellates): Chromoprotein changes and the consequenses for spectral absorption. EOS
    Vitenskapelig artikkel
  • Johnsen, Geir; Nelson, N. B.; Jovine, R. V. M.; Prezelin, B. B.. (1994) Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johnsen, Geir; Samset, O.; Granskog, L.; Sakshaug, Egil. (1994) In vivo absorption characteristics in 10 classes of phytoplankton: Taxonomic characteristics and responses to photoadaption by means of discriminant and HPLC analysis. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Jovine, R. V.; Schofield, O.; Johnsen, Geir; Prezelin, B. B.. (1994) Photoacclimatory differences in the light-harvesting complex of the bloom forming dinoflagellates Heterocapsa pygmaea and Prorocentrum minimum. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir. (1994) Light Harvesting and Utiliation in Marine Phytoplankton: Species-Specific and Photoadaptive Responses. Dr. Scient. Thesis in Marine Botany, University of Trondheim
    Doktorgradsavhandling

1993

  • Volent, Zsolt; Johnsen, Geir. (1993) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a buoy. Underwater light measurements. Proceedings from International Symposium on high latitude optics.
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1993) Bio-optical characteristics and photoadaptive responses in the toxic and bloomforming dinoflagellates Gyrodinium aureolum, Gymnodinium galatheanum two strains of Prorocentrum minium. Journal of Phycology
    Vitenskapelig artikkel
  • Gilstad, Mona; Johnsen, Geir; Sakshaug, Egil. (1993) Photosynthetic parameters, pigment composition and respiration rates of the marine diatom Skeletonema costatum grown in continuous light and a 12:1 light-dark cycle. Journal of Plankton Research
    Vitenskapelig artikkel

1992

  • Volent, Zsolt; Johnsen, Geir. (1992) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a moored buoy. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Vitenskapelig artikkel
  • Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1992) Bio-optical characteristicts of phytoplankton in relation to remote sensing. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil; Vernet, Maria. (1992) Pigment composition, spectral characteriation and photosynthetic parameters in Chrysochromulina polylepis. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Syvertsen, E.; Hegseth, E; Johnsen, Geir; Sakshaug, Egil; Gulliksen, B; Lønne, O. J. (1992) Livet i isen (The life in the ice). In Økosystem Barentshavet. [Mangler utgivernavn]
    Fagbok
  • Sakshaug, Egil; Kristiansen, S; Syvertsen, E; Eilertsen, H. C; Gilstad, M; Hegseth, E. N. (1992) Planktonalger (Phytoplankton). In Økosystem Barentshavet. [Mangler utgivernavn]
    Fagbok

1991

  • Johnsen, Geir. (1991) Proceedings from a scientific working meeting. Fisken og Havet
    Vitenskapelig artikkel
  • Johnsen, Geir. (1991) Identification of Chrysochromulina leadbeateri by means of remote sensing. Fisken og Havet
    Vitenskapelig artikkel
  • Sakshaug, Egil; Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1991) Identification of phytoplankton blooms by means of remote sensing. Environment Northern Seas
    Vitenskapelig artikkel
  • Johnsen, Geir; Hegseth, Else Nøst. (1991) Photoadaptation of sea-ice microalgae in the Barents Sea. Polar Biology
    Vitenskapelig artikkel
  • Sakshaug, Egil; Johnsen, Geir; Andresen, Kjersti; Vernet, Maria. (1991) Modeling of light-dependent algal photosynthesis and growth: Experiments with the Barents Sea diatoms Thalassiosira nordensskioeldii and Chaetocero furcellatus. Deep-Sea Research Part II: Topical Studies in Oceanography
    Vitenskapelig artikkel

Tidsskriftspublikasjoner

  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Ødegård, Øyvind; Ingulstad, Mats; Thun, Terje. (2026) Historien om et tre (og dets innbyggere). framsenteret.no
    Kronikk
  • Berge, Jørgen; Bakken, Torkild; Heggland, Kristin; Sneli, Jon-Arne; Ødegård, Øyvind; Ingulstad, Mats. (2025) Exploring Climate Change, Geopolitics, Marine Archeology, and Ecology in the Arctic Ocean Through Wood-Boring Bivalves. Oceanography
    Vitenskapelig artikkel
  • Neves, Luiza S.; Smeby, Kristin Sagosen; Broch, Ole Jacob; Johnsen, Geir; Ardelan, Murat van; Skjermo, Jorunn. (2025) Particulate and dissolved organic carbon losses in high latitude seaweed farms. Science of the Total Environment
    Vitenskapelig artikkel
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Villedende om hypotetiske havbunnsmineraler?. Dagens næringsliv
    Leserinnlegg
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Johnsen, Geir; Hagspiel, Verena. (2024) Norge mangler kunnskap om gruvedrift i dyphavet. Gemini (English edition)
    Kronikk
  • Ingulstad, Mats; Bakken, Torkild; Ellefmo, Steinar Løve; Hagspiel, Verena; Johnsen, Geir. (2024) Feil på feil om gruvedrift på havbunnen - Stortingsmeldingen om gruvedrift på havbunnen holder ikke vann. Dagens næringsliv
    Kronikk
  • Ingulstad, Mats; Bakken, Torkild; Johnsen, Geir; Ellefmo, Steinar Løve; Hagspiel, Verena. (2024) Norway needs to know much more before actually mining the deep sea. Norwegian SciTech News
    Kronikk
  • Overrein, Martin Molberg; Tinn, Phil; Aldridge, David; Johnsen, Geir; Moreira Fragoso, Glaucia. (2024) Biomass estimations of cultivated kelp using underwater RGB images from a mini-ROV and computer vision approaches. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Schartmüller, Bernhard; Mckee, David; Berge, Jørgen; Johnsen, Geir. (2024) Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration. Applied Optics
    Vitenskapelig artikkel
  • Faltynkova, Andrea; Deschenes, Catherine; Zolich, Artur; Wagner, Martin; Johansen, Tor Arne; Johnsen, Geir. (2024) Use of an uncrewed surface vehicle and near infrared hyperspectral imaging for sampling and analysis of aquatic microplastics. Marine Pollution Bulletin
    Vitenskapelig artikkel
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics From Mid-Norway Using Multiple Observational Platforms. Journal of Geophysical Research (JGR): Oceans
    Vitenskapelig artikkel
  • Liu, Hongbo; Summers, Natalie Maria; Chen, Yi-Chun; Løvås, Håvard Snefjellå; Johnsen, Geir; Koestner, Daniel Warren. (2024) Pixelwise immersion factor calibration for underwater hyperspectral imaging instruments. Optics Express
    Vitenskapelig artikkel
  • Moreira Fragoso, Glaucia; Dallolio, Alberto; Grant, Stephen Denis; Garrett, Joseph Landon; Ellingsen, Ingrid Helene; Johnsen, Geir. (2024) The Role of Rapid Changes in Weather on Phytoplankton Spring Bloom Dynamics Captured by an Autonomous Uncrewed Surface Vehicle. Earth and Space Science
    Vitenskapelig artikkel
  • Mo-Bjørkelund, Tore; Majaneva, Sanna Kristiina; Moreira Fragoso, Glaucia; Johnsen, Geir; Ludvigsen, Martin. (2024) Multi-vehicle adaptive 3D mapping for targeted ocean sampling. PLOS ONE
    Vitenskapelig artikkel
  • Bakken, Sivert; Luis, Kelly; Johnsen, Geir; Johansen, Tor Arne. (2023) Evaluating hyperspectral Secchi depth retrieval through hybrid modeling and regression. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Gemini.no
    Kronikk
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Forskning.no
    Kronikk
  • Deschenes, C; Zolich, Artur; Wagner, Martin; Johnsen, Geir; Johansen, Tor Arne; Faltynkova, Andrea. (2023) Unmanned vehicle and hyperspectral imager for a more rapid microplastics sampling and analysis. OCEANS
    Vitenskapelig artikkel
  • Nordahl, A; Dugstad, L; Magnussen, O; Bakken, JB; Johnsen, Geir. (2023) Laksegriseriet. Dagens næringsliv
    Intervju tidsskrift
  • Carson, Siri Granum; Jenssen, Munro, Bjoern; Johnsen, Geir; Mason, Arthur. (2023) En bærekraftig fremtid for Svalbard – er utvinning av dyphavsmineraler en del av svaret?. Svalbardposten
    Kronikk
  • Summers, Natalie Maria; Moreira Fragoso, Glaucia; Johnsen, Geir. (2023) Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night. Scientific Reports
    Vitenskapelig artikkel
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Sivertsen, Eirik Selnæs; Johnsen, Geir; Johansen, Tor Arne. (2023) Hvem skal samle inn, forvalte og ha tilgang til informasjon om havområdene? . Teknisk Ukeblad
    Kronikk
  • Sørensen, Asgeir Johan; Ludvigsen, Martin; Siversten, Eirik; Johnsen, Geir; Johansen, Tor Arne. (2023) Who should collect, manage and have access to data from the oceans?. sciencenorway.no
    Kronikk
  • oudijk, AE; Johansen, Tor Arne; Johnsen, Geir; Alver, Morten Omholt. (2023) Simulating Hyperspectral Datacubes for Ocean Color: A Foundation for Phytoplankton Recognition in Spectral Signatures. OCEANS
    Vitenskapelig artikkel
  • Schartmuller, Bernhard; Anderson, Philip; Mckee, David; Connan-McGinty, Stacey; Kopec, Tomasz Piotr; Daase, Malin Hildegard Elisabeth. (2023) Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters. Applied Optics
    Vitenskapelig artikkel
  • Gerland, Sebastian; Ingvaldsen, Randi Brunvær; Reigstad, Marit; Sundfjord, Arild; Bogstad, Bjarte; Chierici, Melissa. (2023) Still Arctic? — The changing Barents Sea. Elementa: Science of the Anthropocene
    Vitenskapelig oversiktsartikkel/review
  • Williamson, David Roddan; Moreira Fragoso, Glaucia; Majaneva, Sanna Kristiina; Dallolio, Alberto; Halvorsen, Daniel Ørnes; Hasler, Oliver Kevin. (2023) Monitoring Algal Blooms with Complementary Sensors on Multiple Spatial and Temporal Scales. Oceanography
    Vitenskapelig artikkel
  • Bakken, Sivert; Henriksen, Marie Bøe; Birkeland, Roger; Langer, Dennis David; Oudijk, Adriënne Esmeralda; Berg, Simen. (2023) HYPSO-1 CubeSat: First Images and In-Orbit Characterization. Remote Sensing
    Vitenskapelig artikkel
  • Grant, Stephen Denis; Johnsen, Geir; Mckee, David; Zolich, Artur Piotr; Cohen, Jonathan H.. (2023) Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic. Applied Optics
    Vitenskapelig artikkel
  • Connan-McGinty, Stacey; Banas, Neil S.; Berge, Jørgen; Cottier, Finlo Robert; Grant, Stephen; Johnsen, Geir. (2022) Midnight Sun to Polar Night: A Model of Seasonal Light in the Barents Sea. Journal of Advances in Modeling Earth Systems
    Vitenskapelig artikkel
  • Oudijk, Esmée; Hasler, Oliver Kevin; Øveraas, Henning; Marty, Sabine; Williamson, David Roddan; Svendsen, Torbjørn Karl. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole. (2022) Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling. PLOS ONE
    Vitenskapelig artikkel
  • Summers, Natalie; Johnsen, Geir; Mogstad, Aksel Alstad; Løvås, Håvard; Fragoso, Glaucia Moreira; Berge, Jørgen. (2022) Underwater Hyperspectral Imaging of Arctic Macroalgal Habitats during the Polar Night Using a Novel Mini-ROV-UHI Portable System. Remote Sensing
    Vitenskapelig artikkel
  • Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) The role of parapodia and lack of photoacclimation in kleptoplasts of the sacoglossan sea slug Plakobranchus ocellatus. Coral reefs
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Løvås, Håvard; Sture, Øystein; Johnsen, Geir; Ludvigsen, Martin. (2022) Remote Sensing of the Tautra Ridge: An Overview of the World’s Shallowest Cold-Water Coral Reefs. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Horni, K; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2021) Internasjonalt forskningsmiljø dykker i Mjøsa etter at Oppland Arbeiderblad skrev om forurensning. Oppland arbeiderblad
    Populærvitenskapelig artikkel
  • Ringvold, Halldis; Taite, Morag; Allcock, A. Louise; Vecchione, Michael; Péan, Michel; Sandulli, Roberto. (2021) In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca). Scientific Reports
    Vitenskapelig artikkel
  • Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2021) Analysis and Model Development of Direct Hyperspectral Chlorophyll-A Estimation for Remote Sensing Satellites. Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
    Vitenskapelig artikkel
  • Løvås, Håvard; Mogstad, Aksel Alstad; Sørensen, Asgeir Johan; Johnsen, Geir. (2021) A Methodology for Consistent Georegistration in Underwater Hyperspectral Imaging. IEEE Journal of Oceanic Engineering
    Vitenskapelig artikkel
  • Faltynkova, Andrea; Johnsen, Geir; Wagner, Martin. (2021) Hyperspectral imaging as an emerging tool to analyze microplastics: A systematic review and recommendations for future development. Microplastics and Nanoplastics
    Vitenskapelig oversiktsartikkel/review
  • Johnsen, Geir; Zolich, Artur; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan H.; Mckee, David. (2021) All-sky camera system providing high temporal resolution annual time series of irradiance in the arctic. Applied Optics
    Vitenskapelig artikkel
  • Geoffroy, Maxime; Langbehn, Tom Jasper; Priou, Pierre; Varpe, Øystein; Johnsen, Geir; Le Bris, Arnault. (2021) Pelagic organisms avoid white, blue, and red artificial light from scientific instruments. Scientific Reports
    Vitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Stahl, Annette; Johnsen, Geir; Saad, Aya; Thu, Maren; Nøland, Annecken. (2021) Sporhunden som lukter mikroalger. . Gemini.no
    Populærvitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Berge, Jørgen; Johnsen, Geir. (2021) Lysforurensning I Arktis kan ha ødelagt forskningsresultater. Gemini.no
    Populærvitenskapelig artikkel
  • Cardwell, CR; Berge, Jørgen; Johnsen, Geir. (2021) Arctic voyage shines light on some cold, hard truths. The Herald, UK
    Populærvitenskapelig artikkel
  • Cohen, Jonathan H.; Last, Kim; Charpentier, Corie L.; Cottier, Finlo; Daase, Malin; Hobbs, Laura. (2021) Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biology
    Vitenskapelig artikkel
  • Berge, Jørgen; Geoffroy, Maxime; Daase, Malin; Cottier, Finlo Robert; Priou, Pierre; Cohen, Jonathan H.. (2020) Artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 m depth. Communications Biology
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Ødegård, Øyvind; Nornes, Stein Melvær; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan. (2020) Mapping the Historical Shipwreck Figaro in the High Arctic Using Underwater Sensor-Carrying Robots. Remote Sensing
    Vitenskapelig artikkel
  • Gibbens, Sarah; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) As the Arctic warms, light pollution may pose a new treat to marine life. . National Geographic
    Intervju tidsskrift
  • Ramirez-Llodra, Eva; Hilário, Ana; Paulsen, Emil; Costa, Carolina; Bakken, Torkild; Johnsen, Geir. (2020) Benthic Communities on the Mohn’s Treasure Mound: Implications for Management of Seabed Mining in the Arctic Mid-Ocean Ridge. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Johnsen, Geir; Chauton, Matilde Skogen; Cottier, Finlo Robert; Ellingsen, Ingrid H.. (2020) Phytoplankton community succession and dynamics using optical approaches. Continental Shelf Research
    Vitenskapelig artikkel
  • Saad, Aya; Stahl, Annette; Våge, Andreas; Davies, Emlyn John; Nordam, Tor; Aberle-Malzahn, Nicole. (2020) Advancing Ocean Observation with an AI-driven Mobile Robotic Explorer. Oceanography
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Johnsen, Geir; Ludvigsen, Martin. (2019) Shallow-Water Habitat Mapping using Underwater Hyperspectral Imaging from an Unmanned Surface Vehicle: A Pilot Study. Remote Sensing
    Vitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Ludvigsen, Martin; Johnsen, Geir. (2019) Smart undervannsrobot leter etter plankton. Av N Bazilchuk. Forskning.no. Angående NTNU Entice prosjekt publisert i Science Robotics. Forskning.no
    Populærvitenskapelig artikkel
  • Fossum, Trygve Olav; Fragoso, Glaucia Moreira; Davies, Emlyn John; Ullgren, Jenny; Mendes, Renato; Johnsen, Geir. (2019) Toward adaptive robotic sampling of phytoplankton in the coastal ocean. Science robotics
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Poulton, Alex James; Pratt, Nicola Jane; Johnsen, Geir; Purdie, Duncan Alastair. (2019) Trait-based analysis of subpolar North Atlantic phytoplankton and plastidic ciliate communities using automated flow cytometer. Limnology and Oceanography
    Vitenskapelig artikkel
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2019) Sea surface microlayer and elemental composition in phaeo-, chloro-, and rhodophytes in winter and spring. Journal of Phycology
    Vitenskapelig artikkel
  • Kauko, Hanna Maria; Pavlov, Alexey; Johnsen, Geir; Granskog, Mats; Peeken, Ilka; Assmy, Philipp. (2019) Photoacclimation state of an Arctic underice phytoplankton bloom. Journal of Geophysical Research (JGR): Oceans
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Chauton, Matilde Skogen; Fossum, Trygve Olav; Ludvigsen, Martin. (2019) Physical controls on phytoplankton size structure, photophysiology and suspended particles in a Norwegian biological hotspot. Progress in Oceanography
    Vitenskapelig artikkel
  • Liefmann, Stephanie; Järnegren, Johanna; Johnsen, Geir; Murray, Fiona. (2018) Eco-physiological responses of cold-water soft corals to anthropogenic sedimentation and particle shape. Journal of Experimental Marine Biology and Ecology
    Vitenskapelig artikkel
  • Johnsen, Geir; Norli, Marit; Moline, Mark A.; Robbins, Ian; Quillfeldt, Cecilie von; Sørensen, Kai. (2018) The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. Polar Biology
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning truer livet i Arktis. Aftenposten Viten
    Kronikk
  • Ludvigsen, Martin; Berge, Jørgen; Geoffroy, Maxime; Cohen, Jonathan H.; De La Torre, Pedro R.; Nornes, Stein Melvær. (2018) Use of an autonomous surface vehicle reveals small-scale diel vertical migrations of zooplankton and susceptibility to light pollution under low solar irradiance. Science Advances
    Vitenskapelig artikkel
  • Fragoso, Glaucia Moreira; Poulton, Alex J.; Yashayaev, Igor M.; Head, Erica J.H.; Johnsen, Geir; Purdie, Duncan A.. (2018) Diatom biogeography from the Labrador Sea revealed through a trait-based approach. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Dumke, Ines; Ludvigsen, Martin; Ellefmo, Steinar Løve; Søreide, Fredrik; Johnsen, Geir; Murton, Bramley J.. (2018) Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field. IEEE Transactions on Geoscience and Remote Sensing
    Vitenskapelig artikkel
  • Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Langbehn, Tom; Cottier, Finlo Robert. (2018) Increased occurrence of the jellyfish Periphylla periphylla in the European high Arctic. Polar Biology
    Short communication
  • Kauko, Hanna Maria; Olsen, Lasse Mork; Duarte, Pedro; Peeken, Ilka; Granskog, Mats A.; Johnsen, Geir. (2018) Algal colonization of young arctic sea ice in spring. Frontiers in Marine Science
    Vitenskapelig artikkel
  • Dumke, Ines; Purser, Autun; Marcon, Yann; Nornes, Stein Melvær; Johnsen, Geir; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging as an in situ taxonomic tool for deep-sea megafauna. Scientific Reports
    Vitenskapelig artikkel
  • Fossum, Trygve Olav; Eidsvik, Jo; Ellingsen, Ingrid H.; Alver, Morten; Fragoso, Glaucia Moreira; Johnsen, Geir. (2018) Information-driven robotic sampling in the coastal ocean. Journal of Field Robotics (JFR)
    Vitenskapelig artikkel
  • Ødegård, Øyvind; Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2018) Underwater hyperspectral imaging: a new tool for marine archaeology. Applied Optics
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2018) Lysforurensning - enda en kilde til bekymring. Svalbardposten
    Kronikk
  • Dumke, Ines; Nornes, Stein Melvær; Purser, Autun; Marcon, Yann; Ludvigsen, Martin; Ellefmo, Steinar Løve. (2018) First hyperspectral imaging survey of the deep seafloor: High-resolution mapping of manganese nodules. Remote Sensing of Environment
    Vitenskapelig artikkel
  • Gabrielsen, Tove M.; Johnsen, Geir. (2018) Skogen på Svalbard. Svalbardposten
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2017) Kunnskapshull om livet i Arktis i mørketiden. Aftenposten Viten
    Kronikk
  • Berge, Jørgen; Johnsen, Geir. (2017) Superkommunisten. Svalbardposten
    Kronikk
  • Berge, Jørgen; Johnsen, Geir. (2017) Om bambus, spøkelseskreps og et Arktis i endring. Svalbardposten
    Kronikk
  • Assmy, Philipp; Fernández-Méndez, Mar; Duarte, Pedro; Meyer, Amelie; Randelhoff, Achim; Mundy, Christopher John. (2017) Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ic. Scientific Reports
    Vitenskapelig artikkel
  • Mogstad, Aksel Alstad; Johnsen, Geir. (2017) Spectral characteristics of coralline algae: a multi-instrumental approach, with emphasis on underwater hyperspectral imaging. Applied Optics
    Vitenskapelig artikkel
  • Otterlei, Inger; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Hareide, Nils Roar; Christensen-Dalsgaard, Signe. (2017) 300 000 sjøfugl er forsvunnet fra Runde. Sunnmørsposten
    Intervju tidsskrift
  • Johnsen, Geir; Christiansen, Hanne H; Ravolainen, Virve; Reymert, Per Kyrre; Jenssen, Eva Therese; Arlov, Thor Bjørn. (2017) Utfordrende natur og sikkerhet på Svalbard. Svalbardposten
    Kronikk
  • Kauko, Hanna Maria; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey K.; Mundy, C.J.; Duarte, Pedro. (2017) Windows in Arctic sea ice: light transmission and ice algae in a refrozen lead. Journal of Geophysical Research (JGR): Biogeosciences
    Vitenskapelig artikkel
  • Ostaszewska, Kaja; Balazy, Piotr; Berge, Jørgen; Johnsen, Geir; Staven, Robert. (2017) Seabirds during Arctic Polar Night: underwater observations from Svalbard archipelago, Norway. Waterbirds (De Leon Springs, Fla.)
    Vitenskapelig artikkel
  • Johnsen, Geir. (2016) Yrende liv i Isfjorden. Svalbardposten
    Populærvitenskapelig artikkel
  • Bjørgan, Espen Halvorsen; Johnsen, Geir; Kjeken, Jon; Ludvigsen, Martin. (2016) Fant buss på 600 m dybde. Adresseavisen
    Populærvitenskapelig artikkel
  • Aarskog, Karine Nigar; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2016) Et stort løft for arktisk forskning (NTNU & UiT). Universitetet i Tromsø
    Fagartikkel
  • Berge, Jørgen; Falk-Petersen, Stig; Renaud, Paul E.; Daase, Malin; Geoffroy, Maxime; Johnsen, Geir. (2016) En reise mot Ultima Thule. Svalbardposten
    Populærvitenskapelig artikkel
  • Lervik, Frank; Johnsen, Geir; Ludvigsen, Martin; Kjeken, John. (2016) Det ligger flere busser der. Adresseavisen
    Populærvitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Ludvigsen, Martin; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Mørkets fyrster, varulver og Indiana Jones. Gemini
    Populærvitenskapelig artikkel
  • Haudemann-Andersen, Jørn; Lystad, M S; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Blå lys i det kalde dyp. NRK Trøndelag, Nyheter
    Populærvitenskapelig artikkel
  • Haugstad, Tor; Erdal, Ivar; Johnsen, Geir; Sørensen, Asgeir Johan; Fjærvik, Nils. (2016) Gründerne mener dette kameraet kan bli det nye ekkoloddet – Ecotone er kandidat til TU Tech Award. Teknisk Ukeblad
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Geoffroy, Maxime; Johnsen, Geir; Cottier, Finlo Robert; Bluhm, Bodil; Vogedes, Daniel Ludwig. (2016) Ice-tethered observational platforms in the Arctic Ocean pack ice. IFAC-PapersOnLine
    Vitenskapelig artikkel
  • Cronin, Heather; Cohen, Jonathan H.; Berge, Jørgen; Johnsen, Geir; Moline, Mark A.. (2016) Bioluminescence as an ecological factor during high Arctic polar night. Scientific Reports
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Mark spiser opp vrak på havbunnen. Fiskaren
    Populærvitenskapelig artikkel
  • Kokkegård, Hanne; Johnsen, Geir; Ludvigsen, Martin; Torre, Pedro De La. (2016) Vitenskab - Bomber fra 2 verdenskrig danner koralrev på 600 m dybde. Danmarks radio
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir. (2016) Mørkets fyrster med påskrudd lys. Svalbardposten
    Populærvitenskapelig artikkel
  • Bazilchuk, Nancy Reney; Leite, Stein Roar; Johnsen, Geir; Kjeken, John; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2016) Bomber og buss på havbunnen. Gemini
    Populærvitenskapelig artikkel
  • Haugstad, Tormod; Erdal, Ivar; Johnsen, Geir. (2016) Kameraet deres «kan bli det nye ekkoloddet». Nå er det norske selskapet i ferd med å lykkes. Teknisk Ukeblad
    Intervju tidsskrift
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) Opp fra polarnattens mørke. Aftenposten Viten
    Kronikk
  • Donahue, Michelle; Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) The age of humans - living in the anthropocene - "Termites of the sea" found munching wood near Arctic shipwrecks. Smithsonian
    Populærvitenskapelig artikkel
  • Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Aas, Lars Martin Sandvik. (2016) The use of underwater hyperspectral imaging deployed on remotely operated vehicle – methods and applications. IFAC-PapersOnLine
    Vitenskapelig artikkel
  • Bondø, Tor-Hartvig; Johnsen, Geir; Berge, Jørgen. (2016) Fant yrende liv i polarnatta. VG : Verdens gang
    Populærvitenskapelig artikkel
  • Kintisch, Eli; Berge, Jørgen; Last, Kim; Cohen, Jonathan; Johnsen, Geir. (2016) Voyage into darkness . Science
    Intervju tidsskrift
  • Bazilchuk, Nancy Reney; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Gemini (English edition)
    Intervju tidsskrift
  • Berge, Jørgen; Johnsen, Geir; Ødegård, Øyvind. (2016) Kinderegg i polarnatten. Svalbardposten
    Kronikk
  • Krüger, Frida Jørstad; Johnsen, Geir; Kjeken, John; Ludvigsen, Martin. (2016) Gammel buss ble korallrev. NRK Viten
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Renaud, Paul E.; Johnsen, Geir; Darnis, Gerald; Geoffroy, Maxime; Daase, Malin. (2016) I grenselandet (mellom Tull og Thule). Svalbardposten
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Ødegård, Øyvind; Johnsen, Geir. (2016) A bitter-sweet symphony. Svalbardposten
    Kronikk
  • Berge, Jørgen; Johnsen, Geir; Ludvigsen, Martin; Cohen, Jonathan. (2016) Design for latskap - men med store muligheter. Svalbardposten
    Kronikk
  • Førde, Henny; Forbord, Silje; Handå, Aleksander; Fossberg, Julia; Arff, Johanne; Johnsen, Geir. (2016) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. Journal of Applied Phycology
    Vitenskapelig artikkel
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Sørensen, Asgeir Johan; Last, Kim; Falk-Petersen, Stig. (2015) Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton?. PLOS ONE
    Vitenskapelig artikkel
  • Berge, Jørgen; Renaud, Paul; Darnis, Gérald; Cottier, Finlo; Last, Kim; Gabrielsen, Tove M.. (2015) In the dark: a review of ecosystem processes during the Arctic polar night. Progress in Oceanography
    Vitenskapelig artikkel
  • Berge, Jørgen; Daase, Malin; Renaud, Paul; Ambrose, William G. Jr.; Darnis, Gérald; Last, Kim S. (2015) Unexpected levels of biological activity during the polar night offer new perspectives on a warming Arctic. Current Biology
    Vitenskapelig artikkel
  • Nilssen, Ingunn; Dos Santos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral, Marcelo M.; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan; Nilssen, Ingunn. (2015) Enabling technology for Arctic research. Pan European Networks: Science and Techology Magazine
    Vitenskapelig oversiktsartikkel/review
  • Nilssen, Ingunn; Santos dos, Francisco; Coutinho, Ricardo; Gomes, Natalia; Cabral Montenegro, Marcelo; Eide, Ingvar. (2015) Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data. Marine Environmental Research
    Vitenskapelig artikkel
  • Rodriguez, Francisco; Garrido, J.L.; Sabrino, C; Johnsen, Geir; Riobo, P; Franco, J. (2015) Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environmental Microbiology
    Vitenskapelig artikkel
  • Nilssen, Ingunn; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Moline, Mark A.; Berge, Jørgen. (2015) Integrated environmental mapping and monitoring, a methodological approach to optimise knowledge gathering and sampling strategy. Marine Pollution Bulletin
    Vitenskapelig artikkel
  • Hovland, Erlend Kjeldsberg; Hancke, Kasper; Alver, Morten; Drinkwater, Kennneth F.; Høkedal, Jo; Johnsen, Geir. (2014) Optical impact of an Emiliania huxleyi bloom in the frontal region of the Barents Sea. Journal of Marine Systems
    Vitenskapelig artikkel
  • Hancke, Kasper; Hovland, Erlend Kjeldsberg; Volent, Zsolt; Pettersen, Ragnhild; Johnsen, Geir; Moline, Mark A.. (2014) Optical properties of CDOM across the Polar Front in the Barents Sea: Origin, distribution and significance. Journal of Marine Systems
    Vitenskapelig artikkel
  • Cohen, Jonathan; Cronin, Heather; Moline, Mark A.; Berge, Jørgen; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Are krill eyes useful in the high Arctic polar night?. Ocean Optics
    Sammendrag/abstract
  • Hansen, Ingrid; Pettersen, Ragnhild; Beuchel, Frank; Cochrane, Sabine; Frantzen, marianne; Ekehaug, Stefan. (2014) Underwater hyperspectral imaging (UHI) for environmental mapping and monitoring of seabed habitats. Ocean Optics
    Sammendrag/abstract
  • Aamot, Inga; Pokrzywinski, Kaytee; Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2014) Light Climate and Status of the Photosynthetic Machinery in Macroalgae in the Polar Night. Ocean Optics
    Sammendrag/abstract
  • Nornes, Stein Melvær; Candeloro, Mauro; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Photomosaic camera as simultaneous data collector and navigation aid on unmanned underwater vehicles. Ocean Optics
    Sammendrag/abstract
  • Johnsen, Geir; Ekehaug, Stefan; Hansen, Ingrid; Sørensen, Asgeir Johan. (2014) The use of underwater hyperspectral imaging deployed on remotely operated vehicles to identify, map and monitor bio-geo-chemical objects of interest. Ocean Optics
    Sammendrag/abstract
  • Nilssen, Ingunn; Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen; Nornes, Stein Melvær. (2014) Integrated environmental monitoring; a methodological approach to optimise knowledge gathering and sampling strategy. Ocean Optics
    Sammendrag/abstract
  • Berge, Jørgen; Cottier, Finlo; Varpe, Øystein; Renaud, Paul; Falk-Petersen, Stig; Kwasniewski, Sawomir. (2014) Arctic complexity: A case study on diel vertical migration of zooplankton. Journal of Plankton Research
    Vitenskapelig artikkel
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Glowing in the dark: Discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Vitenskapelig artikkel
  • Johnsen, Geir; Candeloro, Mauro; Berge, Jørgen; Moline, Mark A.. (2014) Erratum to: Glowing in the dark: discriminating patterns of bioluminescence from different taxa during the Arctic polar night. Polar Biology
    Errata
  • Valle, Kristin Collier; Nymark, Marianne; Aamot, Inga; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green, and red light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel
  • Pettersen, Ragnhild; Johnsen, Geir; Bruheim, Per; Andreassen, Trygve. (2014) Development of hyperspectral imaging as a bio-optical taxonomic tool for pigmented marine organisms. Organisms Diversity & Evolution
    Vitenskapelig artikkel
  • Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Lågstad, Petter Arthur; Ødegård, Øyvind. (2014) Scientific Operations Combining ROV and AUV in the Trondheim Fjord. Marine Technology Society journal
    Vitenskapelig artikkel
  • Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Ferreira, Ana Sofia; Johnsen, Geir. (2013) Dynamics regulating major trends in Barents Sea temperatures and subsequent effect on remotely sensed particulate inorganic carbon. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Winge, Per; Andresen, Kjersti; Johnsen, Geir. (2013) Molecular and photosynthetic responses to prolonged darkness and subsequent acclimation to re-illumination in the diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Falk-Pettersen, Stig. (2013) Mørkets hemmeligheter. Svalbardposten
    Populærvitenskapelig artikkel
  • Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Greenacre, Michael; Johnsen, Geir. (2013) Quantifying the light sensitivity of Calanus spp. during the polar night: potential for orchestrated migrations conducted by ambient light from the sun, moon, or aurora borealis. Polar Biology
    Vitenskapelig artikkel
  • Elde, Anette; Pettersen, Ragnhild; Bruheim, Per; Järnegren, Johanna; Johnsen, Geir. (2012) Pigmentation and Spectral Absorbance Signatures in Deep-Water Corals from the Trondheimsfjord, Norway. Marine Drugs
    Vitenskapelig artikkel
  • Berge, Jørgen; Båtnes, Anna Solvang; Johnsen, Geir; Blackwell, Susan; Moline, Mark A.. (2012) Bioluminescence in the high Arctic during the polar night. Marine Biology
    Vitenskapelig artikkel
  • Gabrielsen, Tove M; Quillfeldt, Cecilie von; Johnsen, Geir; Berge, Jørgen. (2012) Varm vinter, sen vår i fjorden. Svalbardposten
    Leserinnlegg
  • Pettersen, Ragnhild; Johnsen, Geir; Berge, Jørgen; Hovland, Erlend Kjeldsberg. (2011) Phytoplankton chemotaxonomy in waters around the Svalbard archipelago reveals high amounts of Chl b and presence of gyroxanthin-diester. Polar Biology
    Vitenskapelig artikkel
  • Jouenne, Fabien; Eikrem, Wenche; Le Gall, F; Marie, Dominique; Johnsen, Geir; Vaulot, Daniel. (2011) Prasinoderma singularis sp. nov. (Prasinophyceae, Chlorophyta), a Solitary Coccoid Prasinophyte from the South-East Pacific Ocean. Protist
    Vitenskapelig artikkel
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2011) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Vitenskapelig artikkel
  • Volent, Zsolt; Johnsen, Geir; Hovland, Erlend Kjeldsberg; Folkestad, Are; Olsen, Lasse Mork; Tangen, Karl. (2011) Improved monitoring of phytoplankton bloom dynamics in a Norwegian fjord by integrating satellite data, pigment analysis, and Ferrybox data with a coastal observation network. Journal of Applied Remote Sensing
    Vitenskapelig artikkel
  • Aamot, Inga; Berge, Jørgen; Hancke, Kasper; Johnsen, Geir; Moline, Mark; Schofield, Oscar. (2010) NORUS - Technology Development for Marine Monitoring and Ocean Observation:An North America-Norway educational program. http://ipy-osc.no/abstract/
    Sammendrag/abstract
  • Thoen, Hanne Halkinrud; Johnsen, Geir; Berge, Jørgen. (2010) Pigmentation and spectral absorbance in the deep-sea arctic amphipods Eurythenes gryllus and Anonyx sp. Polar Biology
    Vitenskapelig artikkel
  • Johnsen, Geir; Søreide, Fredrik. (2010) Underwater hyperspectral imaging of marine mineral deposits. Underwater Mining meeting Institute (UMI)
    Sammendrag/abstract
  • Evertsen, Jussi; Johnsen, Geir. (2009) In vivo and in vitro differences in chloroplast functionality in the two north Atlantic sacoglossans (Gastropoda, Opisthobranchia) Placida dendritica and Elysia viridis. Marine Biology
    Vitenskapelig artikkel
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2009) Microscopic hyperspectral imaging used as a bio-optical taxonomic tool for micro- and macroalgae. Applied Optics
    Vitenskapelig artikkel
  • Berge, Jørgen; Cottier, Finlo; Last, Kim S.; Varpe, Øystein; Leu, Eva; Søreide, Janne. (2009) Diel vertical migration of Arctic zooplankton during the polar night. Biology Letters
    Vitenskapelig artikkel
  • Berge, Jørgen; Lønne, Ole Jørgen; Renaud, Paul; Johnsen, Geir; Gulliksen, Bjørn; Varpe, Øystein. (2009) Polartorsken - vil den bli utkonkurrert av sørlige fiskearter?. Svalbardposten
    Populærvitenskapelig artikkel
  • Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Hancke, Kasper; Andresen, Kjersti. (2009) An integrated analysis of molecular acclimation to high light in the marine diatom Phaeodactylum tricornutum. PLOS ONE
    Vitenskapelig artikkel
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combined use of AUV and hyperspectral imaging to mapping sea-surface and macroalgae. Ocean Optics
    Sammendrag/abstract
  • Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Zotchev, Sergey. (2008) Actinomycetes from sediments in the Trondheim Fjord, Norway: Diversity and biological activity. Marine Drugs
    Vitenskapelig artikkel
  • Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2008) Rate of O2 production derived from pulse-amplitude-modulated fluorescence: Testing three biooptical approaches against measured O2-production rate. Journal of Phycology
    Vitenskapelig artikkel
  • Bakken, Torkild; Evertsen, Jussi; Johnsen, Geir. (2008) Vitenskapelig dykking - behov for endringer i forskriften. Dykkenytt : informasjonsorgan for dykkeindustrien
    Fagartikkel
  • Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, RN. (2008) Temperature effects on microalgal photosynthesis-light responses measured by O2 production, pulse-amplitude-modulated fluorescence, and C-14 assimilation. Journal of Phycology
    Vitenskapelig artikkel
  • Volent, Z; Johnsen, Geir; Sigernes, Fred. (2007) Kelp forest mapping by use of airborne hyperspectral imager. Journal of Applied Remote Sensing
    Vitenskapelig artikkel
  • Carlsen, BP; Johnsen, Geir; Berge, Jørgen; Kuklinski, P. (2007) Biodiversity patterns of macro-epifauna on different lamina parts of Laminaria digitata and Saccharina latissima collected during spring and summer 2004 in Kongsfjorden, Svalbard. Polar Biology
    Vitenskapelig artikkel
  • Cibic, Tamara; Blasutto, Oriana; Hancke, Kasper; Johnsen, Geir. (2007) Microphytobenthic species composition, pigment concentration, and primary production in sublittoral sediments of the Trondheimsfjord (Norway). Journal of Phycology
    Vitenskapelig artikkel
  • Ludvigsen, Martin; Sortland, Bjørn; Johnsen, Geir; Singh, Hanumant. (2007) Applications of Geo-Referenced Underwater Photo Mosaics in Marine Biology and Archaeology. Oceanography
    Vitenskapelig artikkel
  • Edvardsen, B; Eikrem, W; Shalchian-Tabrizi, K; Riisberg, I; Johnsen, Geir; Naustvoll, L. (2007) Verrucophora farcimen gen. et sp nov (Dictyochophyceae, Heterokonta) - A bloom-forming ichthyotoxic flagellate from the Skagerrak, Norway. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (2007) Biooptical characteristics of PSII and PSI in 33 species (13 pigment groups) of marine phytoplankton, and the relevance for pulse-amplitude-modulated and fast-repetition-rate fluorometry. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir. (2007) Arctic Life: Bridging ecosystem function using remote sensing technologies. Svalbard Science Forum
    Populærvitenskapelig artikkel
  • Evertsen, Jussi; Burghardt, Ingo; Johnsen, Geir; Wägele, Heike. (2007) Retention of functional chloroplasts in some sacoglossans from the Indo-Pacific and Mediterranean. Marine Biology
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Leder
  • Olsen, Lasse Mork; Öztürk, M.; Sakshaug, Egil; Johnsen, Geir. (2006) Photosynthesis-induced phosphate precipitation in seawater: ecological implications for phytoplankton. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Rodriguez, F; Chauton, Matilde Skogen; Johnsen, Geir; Andresen, Kjersti; Olsen, Lasse Mork; Zapata, M.. (2006) Photoacclimation in phytoplankton: implications for biomass estimates, pigment functionality and chemotaxonomy. Marine Biology
    Vitenskapelig artikkel
  • Johnsen, Geir. (2006) Warming Arctic sees return of blue mussels after 1000 years. National Geographic
    Populærvitenskapelig artikkel
  • Onstad, L; Evertsen, Jussi; Johnsen, Geir. (2006) Snegle på solceller. Gemini
    Populærvitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag; Pampanin, Daniella. (2006) The Mytilus edulis population in Svalbard: how and why. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Burghardt, Ingo; Evertsen, Jussi; Johnsen, Geir; Wägele, Heike. (2005) Solar powered seaslugs - Mutualistic symbiosis of aeolid nudibranchia (Mollusca, Gastropoda, Opisthobranchia) with Symbiodinium. Symbiosis
    Vitenskapelig artikkel
  • Fossmark, Reidar; Johnsen, Geir; Waldum, Helge; Johannesen, Eli Marie. (2005) Rebound acid hypersecretion after long-term inhibition of gastric acid secretion. Alimentary Pharmacology and Therapeutics
    Vitenskapelig artikkel
  • Berge, Jørgen; Johnsen, Geir; Nilsen, Frank; Gulliksen, Bjørn; Slagstad, Dag. (2005) Ocean temperature oscillations enable reappearance of blue mussels Mytilus edulis in Svalbard after 1000 year absence. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “Forskning og foto under vann”. NEWTON websider (NRK)
    Populærvitenskapelig artikkel
  • Bordvik, Hans Otto; Johnsen, Geir. (2005) “En glupsk nellik”. NEWTON websider (NRK)
    Populærvitenskapelig artikkel
  • Indergaard, M; Nordtvedt, M; Johnsen, Geir. (2005) Satellittmålinger for miljøet (SISCAL project, NTNU, IBI). Gemini
    Populærvitenskapelig artikkel
  • Berge, J; Johnsen, Geir; Nilsen, F; Gulliksen, B; Slagstad, D. (2005) Ocean temperature oscillations causes the reappearance of blue mussels in Svalbard after 1000 years of absence. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Chauton, Matilde Skogen; Tilstone, Gavin; Legrand, Catherine; Johnsen, Geir. (2004) Changes in pigmentation, bio-optical characteristics and photophysiology, during phytoflagellate succession in mesocosms. Journal of Plankton Research
    Vitenskapelig artikkel
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL End User Requirement evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Vitenskapelig artikkel
  • Figueroa, F. L.; Escassi, L.; Perez-Rodriguez, E.; Korbee, N.; Johnsen, Geir. (2003) Effects of the irradiance in the short-term on accumulation of mycosporine like amino acids in sun and shade species of the red algal genus Porphyra. Photochemistry and Photobiology
    Vitenskapelig artikkel
  • Chauton, Matilde Skogen; Optun, Odd Inge; Bathen, F. T; Volent, Z.; Gribbestad, Ingrid S.; Johnsen, Geir. (2003) HR MAS 1H NMR spectroscopy analysis of whole cells of marine microalgae. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation document. www.siscal.net. Satellite-based Information System on Coastal Areas and Lakes. IST 2000
    Vitenskapelig artikkel
  • Gileptis, Laura; Johnsen, Geir; Moxness, Helge; Norwich, Inger; Vangen, Steffen. (2002) Modul for mønstergjenkjenning/klassifisering i DynamicImager ved bruk av backpropagation-algoritmen. Piksel'n : Organ for NOBIM (Norsk forening for bildebehandling og mønstergjenkjenning)
    Vitenskapelig artikkel
  • Millie, David; Schofield, Oscar; Kirkpatrick, Gary J.; Johnsen, Geir; Evens, Tim J.. (2002) Using absorbance and fluorescence spectra to discriminate microalgae. European journal of phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Børsheim, Knut Yngve; Johansen, Torunn Beate. (2002) Production and mortality of phytoplankton and sea-ice microalgae in the southern ocean. Rapportserie (Norsk polarinstitutt)
    Vitenskapelig artikkel
  • Graneli, Edna; Legrand, Catherine; Carlsson, Per; Johnsen, Geir; Maestrini, Serge Y.; Reichelt, Michael. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 20). Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment (summary paper). Phycologia
    Vitenskapelig artikkel
  • Legrand, Catherine; Johnsen, Geir; Graneli, Edna; Sakshaug, Egil. (2001) (Proceedings of the 9th International conference on Harmful Algal Blooms. Hobart, Tasmania, 7-11 February 2000.) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Phycologia
    Vitenskapelig artikkel
  • Wägele, Heike; Johnsen, Geir. (2001) New results on histology and photosynthetic performance of solar-powered� opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) containing symbiotic chloroplasts or zooxanthellae. Organisms Diversity & Evolution
    Vitenskapelig artikkel
  • Legrand, Catherine; Johansson, Niclas; Johnsen, Geir; Børsheim, Knut Yngve; Graneli, Edna. (2001) Phagotrophy and toxicity in the photosynthetic Prymnesium patelliferum (Haptophyte). Limnology and Oceanography
    Vitenskapelig artikkel
  • Seppala, J; Johnsen, Geir; Babichenko, S; Leeben, A; Poryvkina, L; Shalapyonok, [Mangler fornavn]. (1998) In vivo light absorption by photosynthetic and photoprotective algal pigments: Methodology and the effects of light acclimation and nutrient limitation. Report Series in Geophysics
    Vitenskapelig artikkel
  • Johnsen, Geir; Dalløkken, Runar; Aure, J; Skjoldal, H. R. (1998) Photophysiology and environmental conditions during a toxic bloom of Chrysochromulina leadbeateri (Prymnesiophyceae). International symposium on Harmful Algal Blooms
    Vitenskapelig artikkel
  • Johnsen, Geir; Eikrem, W.; Dalløkken, R.; Aure, J.; Skjoldal, H. R.. (1998) Physiology and environmental conditions during a toxic blooms of Chrysochromulina leadbeateri Prymnesiophyceae. Journal of Phycology
    Vitenskapelig artikkel
  • Millie, D.; Schofield, O. M.; Kirkpatrick, G. J.; Johnsen, Geir; Tester, P. A.; Vinyard, B. T.. (1997) Phytoplankton pigments and absorption spectra as potential bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellat Gymnodinium breve. Limnology and Oceanography
    Vitenskapelig artikkel
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shading on the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Vitenskapelig artikkel
  • Grzymski, J.; Johnsen, Geir; Sakshaug, Egil. (1997) The significance of intracellular self-shadingon the bio-optical properties of brown, red and green macroalgal species. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Prezelin, B. B.; Jovine, R. V. M.. (1997) Fluorescence excitation spectra and light utiliation in two red tide dinoflagellates. Limnology and Oceanography
    Vitenskapelig artikkel
  • Millie, D; Shofield, O. M; Kirkpatrick, G. J; Tester, P. A; Johnsen, Geir. (1996) Using bio-optical characterisics as bio-markers for harmful algal blooms: A case study of the Florida red-tide dinoflagellate,. EOS
    Vitenskapelig artikkel
  • Schofield, O.; Prezelin, B. B.; Johnsen, Geir. (1996) Wavelength-dependency of maximum quantum yield of carbon fixation for two red tide dinoflagellates, Heterocapsa pygmaea and prorocentrum minimum. Journal of Phycology
    Vitenskapelig artikkel
  • Johnsen, Geir; Volent, Z; Tangen, K; Sakshaug, Egil. (1996) Time-series of potential toxic phytoplankton blooms in North European waters in 1993 using the SEAWATCH-Europe buoy system. EOS
    Vitenskapelig artikkel
  • Vernet, M.; Mitchell, B.G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis cf. pouchetii blooms. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1996) Light harvesting in bloom-forming marine phytoplankton: Species-specifity and photoacclimation,. Scientia Marina
    Vitenskapelig artikkel
  • Vernet, M.; Mitchell, B. G.; Sakshaug, Egil; Johnsen, Geir; Iturriaga, R.; Wassmann, P.. (1996) Evidence for a novel pigment with in vivo absorption maximum at 708 nm associated with Phaeocystis sp. blooms. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Jovine, R. V.; Johnsen, Geir; Prezelin, B. B.. (1995) Isolation of membrane bound chlorophyll a-chlorofhyll c binding light harvesting complexes from the dinoflagellates heterocapsa pygmaea and Prorocentrum minimum. Photosynthesis Research
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1995) Light harvesting in bloom-forming marine phytoplankton: species-specificity and photoadaption. Scientia Marina
    Vitenskapelig artikkel
  • Egeland, E.; Johnsen, Geir; Eikrem, W.; Liaaen-Jensen, S.; Throndsen, J.. (1995) The pigments of Bathycoccus prasinos. Journal of Phycology
    Vitenskapelig artikkel
  • Jovine, R. V; Johnsen, Geir; Prezelin, B. B. (1994) Photoadaptation of Prorocentrum minimum and Heterocapsa pygmaea (Dinoflagellates): Chromoprotein changes and the consequenses for spectral absorption. EOS
    Vitenskapelig artikkel
  • Johnsen, Geir; Nelson, N. B.; Jovine, R. V. M.; Prezelin, B. B.. (1994) Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johnsen, Geir; Samset, O.; Granskog, L.; Sakshaug, Egil. (1994) In vivo absorption characteristics in 10 classes of phytoplankton: Taxonomic characteristics and responses to photoadaption by means of discriminant and HPLC analysis. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Jovine, R. V.; Schofield, O.; Johnsen, Geir; Prezelin, B. B.. (1994) Photoacclimatory differences in the light-harvesting complex of the bloom forming dinoflagellates Heterocapsa pygmaea and Prorocentrum minimum. Journal of Phycology
    Vitenskapelig artikkel
  • Volent, Zsolt; Johnsen, Geir. (1993) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a buoy. Underwater light measurements. Proceedings from International Symposium on high latitude optics.
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil. (1993) Bio-optical characteristics and photoadaptive responses in the toxic and bloomforming dinoflagellates Gyrodinium aureolum, Gymnodinium galatheanum two strains of Prorocentrum minium. Journal of Phycology
    Vitenskapelig artikkel
  • Gilstad, Mona; Johnsen, Geir; Sakshaug, Egil. (1993) Photosynthetic parameters, pigment composition and respiration rates of the marine diatom Skeletonema costatum grown in continuous light and a 12:1 light-dark cycle. Journal of Plankton Research
    Vitenskapelig artikkel
  • Volent, Zsolt; Johnsen, Geir. (1992) Presentation of an optical sensor-"OPTISENS" designed for Eulerian measurements of Phytoplankton on a moored buoy. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Vitenskapelig artikkel
  • Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1992) Bio-optical characteristicts of phytoplankton in relation to remote sensing. ABOOS (Autonomous Bio-Optical Observing Systems) Scientific Symposium : Abstracts
    Vitenskapelig artikkel
  • Johnsen, Geir; Sakshaug, Egil; Vernet, Maria. (1992) Pigment composition, spectral characteriation and photosynthetic parameters in Chrysochromulina polylepis. Marine Ecology Progress Series
    Vitenskapelig artikkel
  • Johnsen, Geir. (1991) Proceedings from a scientific working meeting. Fisken og Havet
    Vitenskapelig artikkel
  • Johnsen, Geir. (1991) Identification of Chrysochromulina leadbeateri by means of remote sensing. Fisken og Havet
    Vitenskapelig artikkel
  • Sakshaug, Egil; Johnsen, Geir; Samset, Oddgeir; Zsolt, Volent. (1991) Identification of phytoplankton blooms by means of remote sensing. Environment Northern Seas
    Vitenskapelig artikkel
  • Johnsen, Geir; Hegseth, Else Nøst. (1991) Photoadaptation of sea-ice microalgae in the Barents Sea. Polar Biology
    Vitenskapelig artikkel
  • Sakshaug, Egil; Johnsen, Geir; Andresen, Kjersti; Vernet, Maria. (1991) Modeling of light-dependent algal photosynthesis and growth: Experiments with the Barents Sea diatoms Thalassiosira nordensskioeldii and Chaetocero furcellatus. Deep-Sea Research Part II: Topical Studies in Oceanography
    Vitenskapelig artikkel

Kunstneriske produksjoner

  • Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2021) “Into the dark” documentary by Mike Snyder following Jørgen Berge (UiT), Geir Johnsen (NTNU) and David McKee (Uni Strathclyde) during Polar Night marine ecology work. .
    Film

Bøker

  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Polar night marine ecology - life and light in the dead of night. Springer Advances in Polar Ecology (0)
    Vitenskapelig antologi/Konferanseserie
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2012) Phytoplankton Pigments: Characterization, Chemotaxonomy and Applications in Oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2012)
    Vitenskapelig antologi/Konferanseserie
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Phytoplankton pigments : characterization, chemotaxonomy and applications in oceanography. Cambridge University Press Cambridge Environmental Chemistry Series (2011)
    Vitenskapelig antologi/Konferanseserie
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Vitenskapelig antologi/Konferanseserie
  • Sakshaug, E.; Johnsen, Geir; Kovacs, Kit. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Lærebok
  • Sakshaug, Egil; Johnsen, Geir; Kovacs, Kit M.. (2009) Ecosystem Barents Sea. Tapir Akademisk Forlag Tapir Akademisk Forlag
    Fagbok
  • Sakshaug, Egil; Johnsen, Geir. (2005) Algal cultures, Analogues of Blooms and Applications. Multi-Science Publishing Multi-Science Publishing
    Vitenskapelig antologi/Konferanseserie
  • Syvertsen, E.; Hegseth, E; Johnsen, Geir; Sakshaug, Egil; Gulliksen, B; Lønne, O. J. (1992) Livet i isen (The life in the ice). In Økosystem Barentshavet. [Mangler utgivernavn]
    Fagbok
  • Sakshaug, Egil; Kristiansen, S; Syvertsen, E; Eilertsen, H. C; Gilstad, M; Hegseth, E. N. (1992) Planktonalger (Phytoplankton). In Økosystem Barentshavet. [Mangler utgivernavn]
    Fagbok

Del av bok/rapport

  • Berge, Jørgen; Johnsen, Geir; Last, Kim; Cohen, Jonathan H.; McKee, David. (2024) Light in polar regions. Orkana Forlag
    Faglig kapittel
  • Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Introduction. Springer
    Innledning
  • Johnsen, Geir; Leu, Eva; Gradinger, Rolf. (2020) Marine Micro- and Macroalgae in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Cohen, Jonathan H.; Berge, Jørgen; Moline, Mark A.; Johnsen, Geir; Zolich, Artur Piotr. (2020) Light in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Berge, Jørgen; Johnsen, Geir. (2020) Life and Light at the Dead of Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Mogstad, Aksel Alstad; Berge, Jørgen; Cohen, Jonathan H.. (2020) Operative Habitat Mapping and Monitoring in the Polar Night. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Pavlov, Alexey K.; Leu, Eva; Hanelt, Dieter; Bartsch, Inka; Karsten, Ulf; Hudson, Stephen. (2019) The Underwater Light Climate in Kongsfjorden and Its Ecological Implications. Springer
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Zolich, Artur Piotr; De La Torre, Pedro R.; Rodwell, Shane; Geoffroy, Maxime; Johnsen, Geir; Berge, Jørgen. (2018) An ice-tethered buoy for fish and plankton research. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2014) Managing data from multiple sensors in an interdisciplinary research cruise. Amsterdam University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Zsolt; Dierssen, Heidi; Pettersen, Ragnhild; Ardelan, Murat Van; Søreide, Fredrik. (2013) Underwater hyperspectral imagery to create biogeochemical maps of seafloor properties. Woodhead Publishing Limited
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Ludvigsen, Martin; Johnsen, Geir; Lågstad, Petter Arthur; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. IEEE conference proceedings
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Brunet, Christophe; Johnsen, Geir; Lavaud, Johan; Roy, Suzanne. (2011) Pigments and photoacclimation processes. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Bricaud, Annick; Nelson, Norman; Prézelin, Barbara; Bidigare, Robert. (2011) In vivo bio-optical properties of phytoplankton pigments. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Moline, Mark; Pettersson, Lasse H.; Pinckney, J. L.; Pozdnyakov, Dmitry; Egeland, Einar Skarstad. (2011) Optical monitoring of phytoplankton bloom pigment signatures. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Acknowledgements. Cambridge University Press
    Annet
  • Roy, Suzanne; Llewellyn, Carole; Egeland, Einar Skarstad; Johnsen, Geir. (2011) Preface. Cambridge University Press
    Forord
  • Llewellyn, Carole A.; Roy, Suzanne; Johnsen, Geir; Egeland, Einar Skarstad; Chauton, Matilde ; Hallegraeff, Gustaff. (2011) Perspectives on future directions. Cambridge University Press
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • von Quillfeldt, Cecilie H.; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • von Quillfeldt, Cecilie; Hegseth, Else Nøst; Johnsen, Geir; Sakshaug, Egil; Syvertsen, Erik E.. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Quillfeldt, C.v.; Hegseth, E.N.; Johnsen, Geir; Sakshaug, E.; Syvertsen, E.E.. (2009) Ice algae. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, E.; Johnsen, Geir; Volent, Z. (2009) Light. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Z; Sakshaug, E.; Sigernes, Fred; Pettersson, L.H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, E.; Johnsen, Geir; Kristiansen, Svein; Quillfeldt, C.v.; Rey, F.; Slagstad, D.. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir; Kristiansen, Svein; von Quillfeldt, Cecilie; Rey, Francisco; Slagstad, Dag. (2009) Phytoplankton and primary production. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Zsolt; Sakshaug, Egil; Sigernes, Fred; Pettersson, Lasse H.. (2009) Remote sensing in the Barents Sea. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir; Volent, Z.. (2009) Light. Tapir Akademisk Forlag
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Sakshaug, Egil; Johnsen, Geir. (2005) Absorption, fluorescence excitation and photoacclimation in phytoplankton. Multi-Science Publishing
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Samset, O.; Sakshaug, Egil. (1998) Bio-optical classification of potential harmful chlorophyll c -containing prymnesiophyte blooms in Scandinavian water.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
  • Johnsen, Geir; Volent, Z.; Tangen, K.; Sakshaug, Egil. (1997) Time series of harmful and benign phytoplankton blooms in northwest European waters using the Seawatch buoy system.
    Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

Rapport

  • Førde, Hedda; Grant, Stephen Denis; Viljanen, Martta; Majaneva, Sanna Kristiina; Johnsen, Geir. (2024) Glow and Know – Evaluating the Potential of Spectral Bioluminescence as a Tool for Zooplankton Identification in situ. NTNU
    Mastergradsoppgave
  • Five, Taran; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2024) Studying Behavioral Responses to Bioluminescence in Zooplankton. NTNU
    Mastergradsoppgave
  • Svendsen, Thea; Majaneva, Sanna Kristiina; Majaneva, Markus; Båtnes, Anna Solvang; Johnsen, Geir. (2023) The usability of eDNA to identify and quantify zooplankton communities. NTNU
    Mastergradsoppgave
  • Krohn-Pettersen, Gitte; Majaneva, Sanna Kristiina; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Blinks in the dark - Detecting and characterizing flash kinetics of bioluminescence for in situ species recognition of zooplankton. NTNU
    Mastergradsoppgave
  • Søreng, Marte Opsahl; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad; Gryte, Kristoffer. (2022) Mapping of Zostera Habitat in the Sublittoral Zone using Underwater Hyperspectral Imaging and Unmanned Surface Vehicle. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Nøland, Annecken; Johnsen, Geir; Aberle-Malzahn, Nicole. (2022) Autonomous Underwater Vehicle (AUV) based study of zooplankton communities, using a silhouette camera and artificial intelligence. NTNU
    Mastergradsoppgave
  • Marnor, Camilla Mult; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Mapping distribution patterns of brittle stars using ROV-based imaging. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Bjerkvoll, Mikkel; Johnsen, Geir; Bakken, Torkild; Mogstad, Aksel Alstad. (2022) Aerial and underwater hyperspectral imagery for shallow benthic nature type mapping. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Larsen, Martin Kvisvik; Mogstad, Aksel Alstad. (2022) Use of different imaging systems for ROV-based mapping of complex benthic habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Johnsen, Geir; Aberle-Malzahn, Nicole; Fragoso, Glaucia; Thu, Maren. (2022) Phytoplankton Spring Bloom Mapping in Coastal Areas Using Autonomous Underwater Vehicle (AUV) and Optical Approaches. NTNU
    Mastergradsoppgave
  • Mogstad, Aksel Alstad; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2021) Underwater hyperspectral imaging as a tool for benthic habitat mapping. Doktoravhandlinger ved NTNU (2021/271)
    Doktorgradsavhandling
  • Ringvold, Halldis; Johnsen, Geir; Andersen, Tom. (2021) Studies on Echinodermata from the NE Atlantic Ocean - Spatial distribution and abundance of Asteroidea, including taxonomic and molecular studies on Crossaster and Henricia genera - Value-chain results, including test fishery, biology, market and nutritional analysis on Parastichopus tremulus (Holothuroidea) from the Norwegian coast. Doktoravhandlinger ved NTNU (2021-254)
    Doktorgradsavhandling
  • Graham, Lisa Kristine Hernandez; Johnsen, Geir; Christensen-Dalsgaard, Signe. (2019) A pilot study assessing drones for mapping and monitoring of European shags. Institutt for biologi, NTNU
    Mastergradsoppgave
  • Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin; Hansen, Roy Edgar; Maarleveld, Thijs. (2018) Towards Autonomous Operations and Systems in Marine Archaeology. Doktoravhandlinger ved NTNU (IMT-12)
    Doktorgradsavhandling
  • Nornes, Stein Melvær; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir; Schjølberg, Ingrid; Ånonsen, Kjetil Bergh. (2018) Guidance and Control of Marine Robotics for Ocean Mapping and Monitoring. Doktoravhandlinger ved NTNU (2018:202)
    Doktorgradsavhandling
  • Strømsholm, Jørgen; Johnsen, Geir; Ludvigsen, Martin. (2018) Eyes beneath the surface - using a miniROV to reveal habitat and dietary choices of the European shag. NTNU MSc thesis
    Mastergradsoppgave
  • Kauko, Hanna Maria; Johnsen, Geir; Assmy, Phillipp. (2018) Light response and acclimation of macroalgae in a changing Arctic. Doktoravhandlinger ved NTNU (2018)
    Doktorgradsavhandling
  • Fjærtoft, Kaja Lønne; Bakken, Torkild; Johnsen, Geir; Ludvigsen, Martin. (2018) Macroalgal detritus: Physical variables and impacts on the benthic macrofaunal community. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Paulsen, Emil; Bakken, Torkild; Ramirez-Llodra, Eva; Johnsen, Geir. (2017) Community structure and biodiversity of the benthic megafauna at the inactive hydrothermal site Mohn's Treasure, on the Mohn's Ridge, Arctic Mid-Ocean Ridge (AMOR) . Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Alvsvåg, Dora Marie; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Berge, Jørgen. (2017) Mapping of a seagrass habitat in Hopavågen, Sør-Trøndelag, with the use of an Autonomous Surface Vehicle combined with optical techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Kamilla, Sporsheim; Sporsheim, Kamilla; Johnsen, Geir; Reitan, Kjell Inge; Evertsen, Antii Jussi. (2017) Astaxanthin as a biomarker for fish feed loading in the marine ecosystem. NTNU, Trondheim
    Mastergradsoppgave
  • Johnsen, Geir; Sandbu, Marthe; Assmy, Philipp. (2017) High Arctic Sea-Ice Algae: The Use of Rapid Light Curves to Assess Photosynthetic Performance of Different Ice-Algal Communities. Master science NTNU
    Mastergradsoppgave
  • Kjeken, John; Johnsen, Geir; Ludvigsen, Martin; Thorsnes, Terje; Lågstad, Petter Arthur. (2017) The growth of benthic organisms in a dumping ground for military bombs and munitions. NTNU, Trondheim
    Mastergradsoppgave
  • Mynors, Julie; Johnsen, Geir; Wernand, Marcel; Volent, Zsolt. (2017) Ocean Colour and Phytoplankton Dynamics - An examination of the Forel-Ule scale in a modern context. NTNU Trondheim
    Mastergradsoppgave
  • Andersson, Ingvild Henriette Kristin; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin. (2017) Bio-optical diversity on cold water coral habitats. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Håpnes, Sverre Julian; Johnsen, Geir; Ludvigsen, Martin; Lågstad, Petter Arthur. (2016) Mapping of demersal fish and benthos by AUV equipped with optical and acoustic imagers at 600 m depth in Trondheimsfjorden. NTNU MSc
    Mastergradsoppgave
  • Liefmann, Stephanie; Johnsen, Geir; Järnegren, Johanna. (2016) Eco-physiological responses of cold-water corals to anthropogenic sedimentation and particle shape. NTNU Mastergrad
    Mastergradsoppgave
  • Jakobsen, June; Johnsen, Geir; Bakken, Torkild; Ludvigsen, Martin; Karlsen, Svein. (2016) The Tautra Cold-Water Coral Reef - Mapping and describing the biodiversity of a cold-water coral reef ecosystem in the Trondheimsfjord by use of multi-beam echo sounding and video mounted on a remotely operated vehicle. NTNU
    Mastergradsoppgave
  • Kjerstad, Ingrid; Johnsen, Geir; Sørensen, Asgeir Johan; Bakken, Torkild. (2014) Underwater Imaging and the effect of Inherent Optical Properties on image quality. NTNU
    Mastergradsoppgave
  • Hatlebakk, Maja; Johnsen, Geir; Søreide, Janne. (2014) Effect of lipids and fatty acid composition on success of reproduction in Calanus glacialis. NTNU
    Mastergradsoppgave
  • Valle, Kristin Collier; Johnsen, Geir; Bones, Atle M. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. NTNU
    Doktorgradsavhandling
  • Hallerud, Charlotte; Johnsen, Geir; Aamot, Inga. (2014) Pigment composition of macroalgae from a Norwegian kelp forest. NTNU
    Mastergradsoppgave
  • Lund, Lene; Johnsen, Geir; Bakken, Torkild; Gabrielsen, Tove. (2014) Morphological diversity in Laminaria digitata - different species or different phenotypes?. Norwegian University of Science and Technology, Department of Biology
    Mastergradsoppgave
  • Førde, Henny; Reitan, Kjell Inge; Johnsen, Geir. (2014) Development of bryozoan fouling on cultivated kelp (Saccharina latissima) in Norway. NTNU
    Mastergradsoppgave
  • Kvernvik, Ane Cecilie; Johnsen, Geir; Aamot, Inga. (2014) How lamina age influence photosynthetic response to light variations in Saccharina latissima. NTNU
    Mastergradsoppgave
  • Kleiven, Wanda; Johnsen, Geir; Ardelan, Murat Van. (2014) Elemental composition in various marine brown, green and red macro algae with respect to season and tissue age. NTNU
    Mastergradsoppgave
  • Eldevik, Tor; Reigstad, Marit; Falck, Eva; Gerland, Sebastian; Jentoft, Sissel; Johnsen, Geir. (2014) Arven efter Nansen. Forskningsplan for det sentrale og nordlige Barentshavet. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Valle, Kristin Collier. (2014) Photoacclimation mechanisms and light responses in marine micro- and macroalgae. Doktoravhandlinger ved NTNU (74)
    Doktorgradsavhandling
  • Ingrid, Hansen; Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Optical Mapping of Cold-water Corals in Trondheimsfjorden and Svalbard. NTNU
    Mastergradsoppgave
  • Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan. (2013) The use of side scan and synthetic aperture sonar mounted on autonomous underwater vehicles for biological habitat mapping. MSc Thesis (2013)
    Mastergradsoppgave
  • Pettersen, Ragnhild; Johnsen, Geir. (2013) Identification of marine organisms using Chemotaxonomy and Hyperspectral imaging. Doktoravhandlinger ved NTNU (292)
    Doktorgradsavhandling
  • Båtnes, Anna Solvang; Johnsen, Geir. (2013) Light in the dark – the role of irradiance in the high Arctic marine ecosystem during polar night. Doktoravhandlinger ved NTNU (151)
    Doktorgradsavhandling
  • Bones, Atle M.; Johnsen, Geir; Brembu, Tore; Nymark, Marianne. (2013) Light responses in the marine diatom Phaeodactylum tricornutum. Doktoravhandlinger ved NTNU (378)
    Doktorgradsavhandling
  • Bjørdalsbakke, Lise Kristin; Johnsen, Geir; Bakken, Torkild; Berge, Jørgen. (2012) Population structure, parasitism and prey preference in Sclerocrangon boreas and S. ferox, Svalbard. NTNU
    Hovedfagsoppgave
  • Fremstedal, Ane Sofia Viset; Bruheim, Per; Sletta, Håvard; Johnsen, Geir. (2012) Utvikling og optimalisering av protokoll for massespektrometrisk metabolsk profilering av adherente humane celler. NTNU Master theses
    Mastergradsoppgave
  • Belseth, Elen; Johnsen, Geir; Berge, Jørgen. (2012) Eco-physiology of the Arctic kelp Laminaria solidungula. NTNU Master thesis
    Mastergradsoppgave
  • Hovland, Erlend Kjeldsberg; Johnsen, Geir; Sakshaug, Egil; Folkestad, Are. (2012) Bio-optics and ecology in Emiliania huxleyi blooms: Field and remote sensing studies in Norwegian water. NTNU
    Doktorgradsavhandling
  • Andersen, Hanne Kile; Johnsen, Geir; Bakken, Torkild. (2011) Gastropods Associated with Laminaria hyperborea and Saccorhiza polyschides in a Norwegian Kelp Forest: Comparison of Sampling and In Situ Imaging Techniques. Norges teknisk-naturvitenskapelige universitet Norges teknisk-naturvitenskapelige universitet
    Mastergradsoppgave
  • Øye, Ane-Marte; Johnsen, Geir. (2009) Photobioreactor time-series of a simulated bloom of Emiliania huxleyi. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Johnsen, Geir; Nepstad, Ina. (2009) Cloning and characterisation of interleukin-6 and interleukin-11b in Atlantic halibut (Hippoglossus hippoglossus). NTNU, Institutt for biologi
    Mastergradsoppgave
  • Thoen, Hanne Halkinrud; Johnsen, Geir. (2009) Pigmentation in the Arctic deep-sea amphipods Eurythenes gryllus and Anonyx sp. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Elde, Anette Cecilie; Johnsen, Geir. (2009) Pigmentation in deep-water corals from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Båtnes, Anna Solvang; Johnsen, Geir. (2008) Trophic interaction between little auks and their zooplankton prey in a high Arctic fjord based on lipid analyses. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS Meeting in Marine Arctic Climate
    Rapport
  • Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Hancke, Kasper; Johnsen, Geir. (2007) Photosynthetic responses as a function of light and temperature: Field and laboratory studies on marine microalgae. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Bio-optical properties and spectral attenuation of photosynthetically available radiation: relation to primary productivity and phytoplankton composition. In Proceedings from Arctic Frontiers: balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Berge, Jørgen; Schander, C; Pampanin, D.M.; Johnsen, Geir. (2007) The past, present and future of the Mytilus edulis population on Svalbard. In Proceedings from Arctic Frontiers: Balancing human use and ecosystem protection. UiT Norges arktiske universitet UiT Norges arktiske universitet
    Rapport
  • Stübner, Eike; Johnsen, Geir. (2007) Biogeographical distribution of temperate vs. Arctic benthic species around Svalbard. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Pettersen, Ragnhild; Johnsen, Geir. (2007) Phytoplankton systematics and pigmentation in the Arctic. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Hovland, Erlend Kjeldsberg; Sakshaug, Egil; Johnsen, Geir. (2007) Tracing Coccolithophorid Blooms in the Barents Sea Using MODIS Level-3 Imagery. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Elvestrand, Jostein; Johnsen, Geir; Sneli, Jon-Arne. (2007) Morphometry and patterns of growth in Acesta excavata (Bivalvia: Limidae) from the Trondheimsfjord, Norway. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Kleiven, Mona; Johnsen, Geir. (2007) Pigmentation in Halocynthia pyriformis from Isfjorden, Spitsbergen. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Roy, Suzanne; Egeland, Einar Skarstad; Johnsen, Geir; Llewellyn, Carole; Wright, Simon. (2006) Report of a Workshop on a Follow-Up Volume of the Book "Phytoplankton Pigments in Oceanography". Scientific Committee on Oceanic Research
    Rapport
  • Sylling, Guro; Thingstad, Per Gustav; Johnsen, Geir. (2006) Marin bunndyrfauna (Gastropoda, Bivalvia) - Konsekvenser av åpning av veifylling over Ramsarområdet Tautrasvaet. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Carlsen, Beth Paludan; Johnsen, Geir. (2006) Makroepifauna associeret med Laminaria digitata og L. saccharina, Svalbard. NTNU, Institutt for biologi
    Mastergradsoppgave
  • Hilstad, Kari; Johnsen, Geir. (2005) In situ tidsseriemålinger av lyshøstingsegenskaper og cellekjemi hos marine makroalger i Trondheimsfjorden. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Olsen, Lasse Mork; Johnsen, Geir. (2005) Interactions between marine osmo- and phagotrophs in different physicochemical environments. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Valle, Kristin Collier; Johnsen, Geir. (2005) Detection of monthly variation in marine red, brown and green macroalgae by means of in situ video, epifluorescence microscopy and numerical digital image analysis. NTNU, Institutt for biologi
    Hovedfagsoppgave
  • Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (2005) Nuclear Magnetic Resonance spectroscopy of marine microalgae: Metabolic profiling and species discrimination from High-resolution Magic Angle Spinning NMR analysis of whole-cell samples. NTNU, Institutt for biologi
    Doktorgradsavhandling
  • Hancke, Torunn Beate; Johnsen, Geir. (2004) SISCAL processor evaluation document. www.siscal.net
    Rapport
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User requirement evaluation document. [Mangler utgivernavn]
    Rapport
  • Johansen, Torunn Beate; Johnsen, Geir. (2002) End User Requirements document. [Mangler utgivernavn]
    Rapport
  • Johnsen, Geir. (2001) SISCAL End User Requirement Satellite-based Information System on Coastal Areas and Lakes. Information Society Technologies Programme funded by the European Comm
    Rapport
  • Johnsen, Geir. (1994) Light Harvesting and Utiliation in Marine Phytoplankton: Species-Specific and Photoadaptive Responses. Dr. Scient. Thesis in Marine Botany, University of Trondheim
    Doktorgradsavhandling

UTSTILLING

  • Berge, Jørgen; Johnsen, Geir. (2020) • Polar Night Exhibitions in Russia 2020. Kaliningrad – World Ocean Museum.
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir. (2020) Polar Night exhibition in Karelia (Petrozavodsk, Russia): 03.03 – 03.04.2020 . Polar Night exhibition, Karelia (Petrozavodsk, Russia). March-April 2020
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir; Tandberg, Anne helene. (2017) Polar night - Life and light in the dead of night. Russian Science Week - Lomonosov Moscow State University
    Museumsutstilling
  • Gätzschmann, Per; Hårsaker, Karstein; Johnsen, Geir; Leite, Stein Roar; Pedersen, Solbjørg; Sørumgård, Marit. (2016) Nye oppdagelser i polarnatta - video. Polarnatt
    Museumsutstilling
  • Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Sørumgård, Marit; Sandbakk, Elin; Johnsen, Tobias Kvendseth. (2016) Polarnatt/Polar Night - ny utstilling med nyheter fra 2015-2016. Polarnattsutstilling ved Vitenskapsmuseet NTNU
    Museumsutstilling
  • Tandberg, Anne Helene S.; Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) POLARNATT - liv og lyst i mulm og mørke. Polarnatt - liv og lyst i mulm og mørke
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir. (2015) Polarnatt - Liv og lys i mulm og mørke Polar night - life and light in the dead of night. Utstilling på Polarmuseet i Tromsø
    Museumsutstilling
  • Aarekol, Lena; Johnsen, Geir; Berge, Jørgen. (2015) Polarnatt. Liv og lys i mulm og mørke Polarnighth. Life and death in dead of night. Utstilling
    Museumsutstilling
  • Berge, Jørgen; Johnsen, Geir; Aarekol, Lena. (2015) Life and light in the dead of night. Museumsutstilling
    Museumsutstilling

Produkt

  • Viljanen, Martta; Førde, Hedda; Majaneva, Sanna Kristiina; Grant, Stephen Denis; Johnsen, Geir. (2024) Zooplankton spectral bioluminescence database.
    Database
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'ee' buoy deployed during MOSAiC in the Sea Ice Ridge Observatory area.
    Annet produkt
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'gg' buoy deployed during MOSAiC in the Monster Bay area.
    Annet produkt
  • Anderson, Philip; Berge, Jørgen; Granskog, Mats A.; Divine, Dmitry V; Katlein, Christian; Itkin, Polona. (2023) Upwelling and downwelling visible radiation measurements of the autonomous ice-tethered OptiCAL 'hh' buoy deployed during MOSAiC in the Dark site Second Year Ice. .
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer. .
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2019).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2017).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2020).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Pictures from an all-sky camera with hourly resolution from the light observatory at Ny-Ålesund, Svalbard, Norway (complete year 2018).
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2018) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2019) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Photosynthetic active radiation (PAR) time series measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Johnsen, Geir; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Kopec, Tomasz Piotr. (2021) Time series (2018) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from SLR camera.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2017) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2017) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) .
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2020) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) Time series (2019) of irradiance in the PAR (photosynthetically active radiation) region measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway) derived from an USSIMO spectroradiometer.
    Annet produkt
  • Berge, Jørgen; Grant, Stephen; Bjørgum, Rune; Cohen, Jonathan; Mckee, David; Johnsen, Geir. (2021) USSIMO spectroradiometer raw data time series (2020) measured under the dome of a light observatory in the Arctic (Ny-Ålesund, Svalbard, Norway).
    Annet produkt

Informasjonsmateriell

  • Oftedahl, Live; Sørensen, Asgeir Johan; Johnsen, Geir. (2023) NTNUs first research satellite on the first mission in the Arctic.
    Nettsider (opplysningsmateriale)
  • Oftedahl, Live; Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2022) Oppdrag Mjøsa får internasjonal oppmerksomhet.
    Nettsider (opplysningsmateriale)
  • Johnsen, Geir; de Luigi, Guendalina. (2022) SeaBee’s Otter surface drone used in Arctic fieldwork.
    Nettsider (opplysningsmateriale)

Undervisning

Emner

  • BI3910 - Master Thesis in Ocean Resources
  • BI3070 - Enabling Technology for Marine Ecological and Marine Sciences studies”
  • BI3911 - Master thesis in MSAQUAH Health Management in Aquaculture
  • BI3061 - Biological Oceanography
  • BI2060 - Marine Ecology
  • BI8075 - Enabling Technology for Marine Ecological and Marine Sciences studies”
  • BI8061 - Biological Oceanography
  • BI2036 - Marine Biodiversity
  • BI8091 - Advanced Biology
  • BI3062 - Science Seminars, Marine

Formidling

2024

  • Faglig foredrag
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) The Observational Pyramid: Unravelling the Physical and Biogeochemical Processes in the Remote Polar Oceans. National Institute of Oceanography Surface Ocean Lower Atmosphere (SOLAS) conference , Goa, India 2024-11-10 - 2024-11-14
  • Poster
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) Decoding Oceanic Mysteries: The Observational Pyramid for Insights into the Physical and Biogeochemical Changes in the Remote Polar Oceans. Framsenteret, Norsk Polarinstitutt Antarktisseminaret 2024 , Tromsø, Norge 2024-05-07 - 2024-05-08
  • Poster
    Viljanen, Martta; Five, Taran; Daase, Malin Hildegard Elisabeth; Hatlebakk, Maja Karoline Viddal; Johnsen, Geir; Majaneva, Sanna Kristiina. (2024) Species-specific light reactions of Arctic Calanus copepods revealed by AI assisted tracking. International Society of Neuroethology 15th International Congress of Neuroethology , Berlin 2024-07-28 - 2024-08-02
  • Poster
    Paiba García, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) Biological diversity in the Norwegian basin: insights for the management of deep-sea mining. The Nordic Society Oikos (NSO) Nordic OIKOS 2024 , Lund 2024-03-12 - 2024-03-15
  • Vitenskapelig foredrag
    Paiba García, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) The deep-sea: in numbers and pictures (related to deep-sea mining). NTNU Ocean Club NTNU Ocean talks , NTNU - Trondheim 2024-04-25 -
  • Vitenskapelig foredrag
    Bakken, Sivert; Johnsen, Geir; Johansen, Tor Arne. (2024) First Look at Mondrian Forests for Hyperspectral Secchi Depth Estimation. EARSeL 13th EARSeL Workshop on Imaging Spectroscopy , Valencia, Spain 2024-04-16 - 2024-04-18
  • Poster
    Singh, Asmita; Sanchez Puerto, Nicolas; Moreira Fragoso, Glaucia; Garrett, Joseph Landon; Johnsen, Geir; Johansen, Tor Arne. (2024) Enhancing Remote Polar Ocean Monitoring: Applying the Observational Pyramid for Improved Climate Insights. Digital Life Norway Digital Life Norway: Research School Conference , Oslo, Norge 2024-10-14 - 2024-10-16
  • Faglig foredrag
    Finstad, Anders Gravbrøt; Bakken, Torkild; Moreira Fragoso, Glaucia; Johnsen, Geir. (2024) Trondheimsfjorden, hva nå?. NTNU Hav og kyst Hovedutvalg for natur, klima og beredskap, Trøndelag fylkeskommune , Trondheim 2024-11-20 - 2024-11-20
  • Poster
    Nevstad, Malin Bø; Johnsen, Geir; Bakken, Torkild; Løvås, Håvard Snefjellå. (2024) Using the observational pyramid for mapping of norwegian seagrass habitats. The Oceanography Society (TOS) Ocean Optics 2024 , Las Palmas De Gran Canaria 2024-10-06 - 2024-10-11
  • Poster
    Paiba Garcia, Laura Catherine; Johnsen, Geir; Bakken, Torkild. (2024) Exploring deep-sea benthos in the Greenland and Norwegian Seas: what may be affected by deep-sea mining?. British Ecological Society British Ecological Conference 2024 , Liverpool 2024-12-10 - 2024-12-13
  • Vitenskapelig foredrag
    Majaneva, Markus; Viljanen, Martta; Grant, Stephen Denis; Daase, Malin Hildegard Elisabeth; Geoffroy, Maxime; Langbehn, Tom. (2024) Illuminating zooplankton diel vertical migration with eDNA metabarcoding in the polar night. The 7th ICES/PICES Zooplankton Production Symposium 2024-03-17 - 2024-03-22
  • Poster
    Viljanen, Martta; Majaneva, Sanna Kristiina; Majaneva, Markus; Daase, Malin Hildegard Elisabeth; Johnsen, Geir; Donner, Kristian. (2024) Arctic zooplankton in changing marine lightscape. Arctic Frontiers 2024 ACTIONS & REACTIONS , Tromsø/online 2024-01-29 - 2024-02-01
  • Poster
    Viljanen, Martta; Daase, Malin Hildegard Elisabeth; Majaneva, Markus; Donner, Kristian; Lindström, Magnus; Johnsen, Geir. (2024) Arctic zooplankton in changing marine lightscape. The 7th ICES/PICES Zooplankton Production Symposium 2024 , Hobart, Tasmania 2024-03-17 - 2024-03-22
  • Vitenskapelig foredrag
    Majaneva, Markus; Viljanen, Martta; Grant, Stephen Denis; Daase, Malin Hildegard Elisabeth; Geoffroy, Maxime; Langbehn, Tom. (2024) Illuminating zooplankton diel vertical migration with eDNA metabarcoding in the polar night. BioStandards 2024-05-27 - 2024-05-30

2023

  • Poster
    Hatlebakk, Maja Karoline Viddal; Viljanen, Martta; Grant, Stephen Denis; Johnsen, Geir. (2023) Behavioral Response in Calanus Copepods to Change in Ambient Light in the Polar Night. Nansen Legacy project Nansen Legacy symposium: Towards a new Arctic Ocean - Past, Present, Future , Tromsø 2023-11-06 - 2023-11-09
  • Poster
    Reigstad, Marit; Gerland, Sebastian; Eldevik, Tor; Kunisch, Erin; Wiedmann, Ingrid; Sundfjord, Arild. (2023) The Nansen Legacy project invites you to its upcoming international symposium in November 2023. Alaska Marine Science Symposium Alaska Marine Science Symposium , Anchorage, Alaska 2023-01-23 - 2023-01-27
  • Poster
    Lange, Benjamin Allen; Cimoli, Emiliano; Johnsen, Geir; Campbell, Karley Lynn; Osanen, Janina; Anhaus, Philipp. (2023) An Overview of Underwater Hyperspectral Imagery of Sea Ice in the Central Arctic Ocean. Nansen Legacy the Nansen Legacy Symposium , Tromsø, Norway 2023-11-07 - 2023-11-09
  • Vitenskapelig foredrag
    Viljanen, Martta; Daase, Malin Hildegard Elisabeth; Hatlebakk, Maja Karoline Viddal; Johnsen, Geir. (2023) Behavioral light responses vary between different species of Arctic zooplankton. University of Helsinki Visionarium XXI , Tvärminne Zoological Station 2023-09-24 - 2023-09-26
  • Vitenskapelig foredrag
    Geoffroy, Maxime; Langbehn, Tom; McKee, David; Sandbank, Einat; Daase, Malin Hildegard Elisabeth; Vogedes, Daniel Ludwig. (2023) Pelagic organisms avoid artificial light from scientific instruments. Research Council Norway Svalbard Science Conference , Oslo 2023-11-02 - 2023-11-03
  • Vitenskapelig foredrag
    Geoffroy, Maxime; Langbehn, Tom; Mckee, David; Sandbank, Einat; Daase, Malin Hildegard Elisabeth; Vogedes, Daniel Ludwig. (2023) Pelagic organisms avoid white, blue, green, and red artificial light from scientific instruments. ICES ICES Symposium on Fisheries Acoustics , Portland, Maine, United States of America 2023-03-27 - 2023-03-30

2022

  • Faglig foredrag
    Oudijk, Esmée; Hasler, Oliver Kevin; Overaas, H; Marty, Sabine; Williamson, David; Svendsen, T. (2022) Campaign For Hyperspectral Data Validation In North Atlantic Coastal Waters. 2022 12th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS) 2022-10-13 - 2022-10-16
  • Faglig foredrag
    Zolich, Artur Piotr; Faltynkova, Andrea; Johnsen, Geir; Johansen, Tor Arne. (2022) Portable Catamaran Drone - an uncrewed sampling vehicle for micro-plastics and aquaculture research. MTS/IEEE OCEANS 2022-10-17 - 2022-10-20
  • Vitenskapelig foredrag
    Dona, Angela; Evertsen, Jussi; Johnsen, Geir. (2022) Lack of kleptoplast photoacclimation and the role of parapodia in the sacoglossan sea slug Plakobranchus ocellatus. University of Bremen 15th International Coral Reef Symposium , Bremen 2022-08-03 - 2022-08-08

2021

  • Vitenskapelig foredrag
    Geoffroy, Maxime; Langbehn, Tom; Varpe, Øystein; Cohen, Jonathan H.; Cottier, Finlo; Last, Kim S. (2021) Behavioral response of marine fish and zooplankton exposed to artificial light during acoustic surveys. . Arctic Science Summit Week , virtual 2021-03-20 - 2021-03-26
  • Vitenskapelig foredrag
    Geoffroy, Maxime; Langbehn, Tom; Varpe, Øystein; Cohen, Jonathan H.; Cottier, Finlo; Last, Kim S. (2021) In situ experiments reveal behavioral response of marine fish and zooplankton when exposed to artificial light during the Arctic polar night. ICES ICES 2021 Annual Science Conference , virtual 2021-10-06 - 2021-10-10
  • Intervju
    Bazilchuk, Nancy; Johnsen, Geir; Berge, Jørgen; Hobbs, Laura; Cohen, Jonathan H.. (2021) Shedding light – on the polar night. By N. Bazilchuk. Krill eyeballs. The werewolf effect. Diel vertical migration. Arctic marine biologists really talk about these things. 63 degrees north (Podcast) 63 degrees north (Podcast) [Internett] 2021-01-27

2020

  • Dokumentar
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Forskere I polarnatta- hvor lyst er mørkt?. Framsenteret, Tromsø Framsenteret, Tromsø [Internett] 2020-01-20
  • Dokumentar
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Is I sikte. Framsenteret, Tromsø Framsenteret, Tromsø [Internett] 2020-01-20
  • Dokumentar
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Mens vi venter på lyset. Framsenteret, Tromsø Framsenteret, Tromsø [Internett] 2020-01-20
  • Dokumentar
    Berge, Jørgen; Johnsen, Geir; Cohen, Jonathan H.. (2020) Overraskelser I mørket. Framsenteret, Tromsø Framsenteret, Tromsø [Internett] 2020-01-20
  • Dokumentar
    Snyder, Mike; Berge, Jørgen; Johnsen, Geir; Mckee, David. (2020) “Into the dark” documentary . [TV] 2020-01-01
  • Vitenskapelig foredrag
    Bakken, Sivert; Wei, J; Lee, Z; Johnsen, Geir; Johansen, Tor Arne; Montoya, J. (2020) Hyperspectral Remote Sensing of the Amazon River Plume. Ocean Science Meeting 2020-02-16 - 2020-02-21
  • Vitenskapelig foredrag
    Johnsen, Geir. (2020) Centre of Autonomous Marine Operations & Systems (AMOS) - selcted research activities. NASA Jet Propulsion Laboratory PRIME + EELS Ocean Worlds Arctic Collaboration (OWAC) Workshop 2020-02-26 - 2020-02-28

2019

  • Intervju
    Aadland, Camilla; Johnsen, Geir. (2019) Denne lusejegeren har vunnet designpris. Bakgrunnshistorie om grunnleggingen av Ecotone og undervanns hyperspektral avbilding. Fiskeribladet no 10 2019 Fiskeribladet no 10 2019 [Fagblad] 2019-01-10
  • Intervju
    Hanger, MR; Johnsen, Geir. (2019) Ny forskningsstrategi: Vil markere at Svalbard er norsk. . Forskning.no Forskning.no [Tidsskrift] 2019-01-16
  • Dokumentar
    NTNU, NTNU; Fossum, Trygve Olav; Johnsen, Geir; Fragoso, Glaucia Moreira; Ludvigsen, Martin. (2019) Ocean life in 3-D: Mapping phytoplankton with a smart AUV. . Phys.org Phys.org [Tidsskrift] 2019-03-07
  • Dokumentar
    Johnsgård, Christer; Johnsen, Geir. (2019) I nabolaga våre har vi ei frodig og eksotisk verd som er skjult for dei fleste av oss. Norge nå går saman med dykkarar, fiskarar og marinbiologar under overflata i Trondheimsfjorden, ein fjord som byr på langt meir enn dei fleste er klar over. NRK TV NRK TV [TV] 2019-02-04
  • Vitenskapelig foredrag
    Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan; Ludvigsen, Martin; Geoffroy, Maxime; Berge, Jørgen. (2019) Shipwrecks in the Arctic – knowledge gaps illustrated by a case from Svalbard . ArcticNet ArcticNet Anuual Scientific Meeting 2019 , Halifax 2019-12-02 - 2019-12-05

2018

  • Programdeltagelse
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw” episode 1 of 3 – What melting sea ice means for life in the Arctic. Vox Vox [Internett] 2018-04-09
  • Vitenskapelig foredrag
    Davies, Emlyn John; Fragoso, Glaucia Moreira; Johnsen, Geir; Ellingsen, Ingrid H.. (2018) Combining optics, imaging and artificial intelligence for in-situ characterisation of complex particle populations. AGU AGU Ocean Sciences , Portland 2018-02-11 - 2018-02-16
  • Dokumentar
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw”, episode 2 of 3 - How a warmer Arctic could intensify extreme weather. Vox Vox [Internett] 2018-04-17
  • Intervju
    Johnsen, Geir; Hanger, Mari Rian. (2018) Manglende interesse for å bruke Ny Ålesund for å utdanne neste generasjons polarforskere. . Universitetsavisa Universitetsavisa [Tidsskrift] 2018-12-13
  • Intervju
    Johnsen, Geir; Hanger, Mari Rian. (2018) Manglende interesse for å bruke Ny Ålesund for å utdanne neste generasjons polarforskere. . Forskning.no Forskning.no [Internett] 2018-12-14
  • Populærvitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen. (2018) Polarnatt. SINTEF Polarnatts seminar med muliggjørende teknologi , Trondheim 2018-01-12 - 2018-01-12
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2018) Light as a cue for life - Arctic. NTNU Kunstakademiet Kunstakademiet - invitert foredrag , Trondheim 2018-04-05 - 2018-04-05
  • Populærvitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2018) Marin polarnatt. Vitensenteret i Trondheim 30 årsjubileum Vitensenteret i Trondheim , Trondheim 2018-03-09 - 2018-03-09
  • Intervju
    Sørensen, Asgeir Johan; Johnsen, Tobias Kvendseth; Johnsen, Geir; Tveter, Nina Elisabeth. (2018) Hvordan høres det ut i havdypet. Gemini.no Gemini.no [Tidsskrift] 2018-03-14
  • Intervju
    Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir; Haugan, Idun. (2018) Slik finner ny teknologi skipsvrak på havets bunn. Gemini.no Gemini.no [Fagblad] 2018-07-23
  • Dokumentar
    Berge, Jørgen; Cottier, Finlo; Johnsen, Geir; Kintisch, Eli. (2018) “Thaw”, episode 3 of 3, Why Atlantic fish are inviding the Arctic . Vox Vox [Internett] 2018-04-23
  • Vitenskapelig foredrag
    Johnsen, Geir. (2018) Underwater hyperspectral imaging for marine biological applications. University of Hawaii at Manoa Seminar at University of Hawaii at Manoa , Honolulu 2018-09-21 - 2018-09-21
  • Vitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan. (2018) Enabling technology fort marine ecology. UiT and Laval University in Quebec, Canada Conference , Tromsø 2018-01-18 - 2018-01-20
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2018) Light as a cue of life - Arctic. NTNU Ocean Club Arktis , ISAK, Trondheim 2018-02-22 - 2018-02-22
  • Faglig foredrag
    Johnsen, Geir. (2018) Polar night - light as a cue of life. HIMB, University of Hawaii at Manoa Seminar at Hawaiian Inst of marine biology (HIMB), University of Hawaii at Manoa , Honolulu 2018-10-31 - 2018-10-31
  • Intervju
    Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan; Johnsen, Geir. (2018) Havets hemmeligheter hentes opp fra dypet. Gemini.no Gemini.no [Tidsskrift] 2018-01-10
  • Intervju
    Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan; Johnsen, Geir; Schiopca, Francesca. (2018) Light pollution from research ship makes Artic zooplankton return to the deep. ZME Science ZME Science [Internett] 2018-01-29

2017

  • Faglig foredrag
    Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Cottier, Finlo Robert. (2017) First records of Periphylla periphylla in a high Arctic fjord: a newcomer or a returning visitor?. Gordon Research Seminar in Polar Marine Science , Ventura 2017-03-25 - 2017-03-31
  • Intervju
    Johnsen, Geir. (2017) Runde – reduksjon av sjøfuglbestand. NRK Dagsrevyen NRK Dagsrevyen [TV] 2017-08-31
  • Intervju
    Johnsen, Geir. (2017) Om roboter og sjøfugl på Runde. NRK Radio NRK Radio [Radio] 2017-07-03
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Polar night – past, present and future – A view for nature management and decision making. Academy of Art NTNU The Henningsvær charter, Henningsvær 28-30th Sep 2017. , Henningsvær 2017-09-28 - 2017-09-30
  • Vitenskapelig foredrag
    Berge, Jørgen; Johnsen, Geir. (2017) Life and light in the dead of night. Lomonosov Moscow State University. Science Week in Moscow , Moskva 2017-10-05 - 2017-10-08
  • Vitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen; Sørensen, Asgeir Johan; Ludvigsen, Martin. (2017) Use of autonomous platforms in the Arctic. Norges Vitenskapsakademi for polarforskning og NTVA Seminar at Norges Vitenskapsakademi for polarforskning og Norges tekniske vitenskapsakademi. , Trondheim 2017-11-30 - 2017-11-30
  • Vitenskapelig foredrag
    Johnsen, Geir; Fragoso, Glaucia Moreira; Davies, Emlyn John; Sørensen, Asgeir Johan; Ludvigsen, Martin; Berge, Jørgen. (2017) Use of optical sensors to identify, map and monitor phyto- and zooplankton. Arctic Change Conference, University of Laval Quebec Arctic change conference, Quebec City, Canada , Quebec City 2017-12-11 - 2017-12-15
  • Poster
    Fragoso, Glaucia Moreira; Davies, Emlyn John; Ellingsen, Ingrid H.; Ludvigsen, Martin; Johnsen, Geir. (2017) Assessing phytoplankton and zooplankton dynamics using optical sensors. Technical University of Sydney Aquafluor II Conference in Sydney , Sydney 2017-12-05 - 2017-12-08
  • Vitenskapelig foredrag
    Berge, Jørgen; Johnsen, Geir; Torre, Pedro De La. (2017) Field activities in Kongsfjorden and relations between ice cinditions, light climate and ecosystem dynamics. NORUT Tromsø Resice project-Arctic 2030 - seminar , Tromsø 2017-09-13 - 2017-09-13
  • Vitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen; Zolich, Artur Piotr. (2017) . Light observatory in Ny Ålesund. NTNU Arctic ABC Seminar at NTNU , Trondheim 2017-10-09 - 2017-10-12
  • Intervju
    Johnsen, Geir. (2017) Dykker så et merkelig fenomen utenfor Egersund. VG - TV VG - TV [TV] 2017-07-25
  • Intervju
    Bazilchuk, Nancy Reney; Johnsen, Geir. (2017) Dark lords, werewolves and Indiana Jones in the Polar Night. Gemini - Starmus issue Gemini - Starmus issue [Tidsskrift] 2017-07-26
  • Vitenskapelig foredrag
    Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan. (2017) Enabling technology for marine ecology studies. University of Porto and NTNU Official meeting between University of Porto and NTNU , Porto 2017-04-04 - 2017-04-05
  • Poster
    Zolich, Artur Piotr; Johnsen, Geir; Berge, Jørgen; Hagan, Bernard. (2017) Ny Ålesund light observatory experiment – from polar night to midnight sun. Arctic Change Conference Arctic Change Conference, Quebec City, Canada , Quebec City 2017-12-12 - 2017-12-16
  • Poster
    Kauko, Hanna M.; Mundy, C J; Granskog, M A; Peeken, Ilka; Johnsen, Geir; Ehn, Jens K.. (2017) Ice algal pigments in thin Arctic sea ice: Trends and correlation to transmitted irradiance. Gordon research conference on Polar marine sciences Gordon research conference on Polar marine sciences, Ventura, USA , Ventura 2017-03-26 - 2017-03-30
  • Poster
    Kauko, Hanna M.; Taskjelle, Torbjørn; Assmy, Philipp; Pavlov, Alexey; Mundy, C J; Duarte, Pedro. (2017) Windows in Arctic sea ice – light transmission and ice algal response in a refrozen lead. Norsk Polarinstitutt ESSAS international open science meeting, Tromsø, Norway, , Tromsø 2017-06-12 - 2017-06-15
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Kunnskapsgenerering, kartlegging og overvåkning I nordområdene med autonome systemer. NTVA Norges Teknisk Vitenskapsakademi (NTVA) årsmøte , Trondheim, NTNU 2017-02-14 - 2017-02-14
  • Intervju
    Sørensen, Asgeir Johan; Johnsen, Geir; Ludvigsen, Martin. (2017) Sjøfugl, fisk og teknologi på Runde Miljøsenter. Vestlandsnytt Vestlandsnytt [Avis] 2017-02-24
  • Intervju
    Johnsen, Geir. (2017) Kvifor minkar det med sjøfugl?. Vestlandsnytt Vestlandsnytt [Avis] 2017-06-23
  • Intervju
    Johnsen, Geir. (2017) Redusert sjøfuglbestand på Runde. NRK Radio - God morgon, Møre & Romsdal NRK Radio - God morgon, Møre & Romsdal [Radio] 2017-06-22
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Bruk av ny teknologi for marine økosystemobservasjoner i luft og vann. Runde Miljøsenter og SFF AMOS Workshop - planlegging av Runde kartlegging, overvåkning og tokt i juni 2017 , Runde 2017-02-28 - 2017-03-01
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Use of enabling technology for marine science applications. Senter for Autonome Marine Operasjoner og Systemer (AMOS) SFF AMOS og FFI Seminar , Trondheim 2017-06-08 - 2019-06-08
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Hyperspectral imaging above and in water – applications. Centre Autonomous Marine Operations and Systems (AMOS) NTNU Small Satellite Seminar , Trondheim 2017-06-06 - 2017-06-06
  • Vitenskapelig foredrag
    Johnsen, Geir. (2017) Can novel technologies revolutionise the montoring regime in sea-based aquaculture?. Ocean Week and NTNU Ocean Week Conference, Trondheim , Trondheim 2017-05-02 - 2017-05-05
  • Intervju
    Johnsen, Geir. (2017) Unikt forskningsprosjekt ved Runde. NRK Nyheter NRK Nyheter [TV] 2017-06-22
  • Faglig foredrag
    Geoffroy, Maxime; Berge, Jørgen; Falk-Petersen, Stig; Johnsen, Geir; Santana Hernandez, Nestor; Cusa, Marine Lure Joana. (2017) Northward range expansion of boreal species into the Arctic: further evidences from the polar night. ArcticChange conference , Quebec City 2017-12-11 - 2017-12-15
  • Poster
    Geoffroy, Maxime; Berge, Jørgen; Majaneva, Sanna Kristiina; Johnsen, Geir; Cottier, Finlo Robert. (2017) First records of Periphylla periphylla in a high Arctic fjord: a newcomer or a returning visitor?. Gordon Reserach Conference in Polar Marine Science , Venture 2017-03-25 - 2017-03-31
  • Intervju
    Ludvigsen, Martin; Johnsen, Geir; Meland, Svein Inge. (2017) Laboratorium på bunnen av Trondheimsfjorden. Adresseavisen Adresseavisen [Avis] 2017-06-28
  • Intervju
    Johnsen, Geir; Sævik, Bjørnar Torvholm. (2017) - Dette er helt fantastisk - Supersjeldent blekksprutfenomen i Ålesund. Sunnmørsposten Sunnmørsposten [Avis] 2017-07-29
  • Vitenskapelig foredrag
    Ludvigsen, Martin; Sørensen, Asgeir Johan; Johnsen, Geir. (2017) Autonomous technology in marine environment mapping and monitoring. Runde Environmental Centre Autonomous Vehicles for ocean monitoring , Runde 2017-12-05 - 2017-12-06
  • Intervju
    Johnsen, Geir; Ludvigsen, Martin; Thorbjørnsen, Susanna Huneide; Berge, Jørgen; Rapp, Ole Magnus. (2017) Nytt superverktøy finner liv i ishavet. Nordlys Nordlys [Avis] 2017-01-31

2016

  • Intervju
    Hyman, Randall; Berge, Jørgen; Cohen, Jonathan; Moline, Mark A.; Johnsen, Geir. (2016) In the polar ‘twilight zone,’ these unusual sea creatures outshine the starlight. Science Magazine Science Magazine [Tidsskrift] 2016-11-04
  • Intervju
    Hyman, Randall; Berge, Jørgen; Johnsen, Geir; Malzahn, Nicole; Cohen, Jonathan. (2016) Floating in the Arctic Darkness. The Atlantic The Atlantic [Tidsskrift] 2016-03-22
  • Intervju
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2016) Nye mysterier avdekkes i Polhavet. Aftenposten Aftenposten [Avis] 2016-01-11
  • Faglig foredrag
    Søreide, Janne E.; Gradinger, Rolf; Niehoff, Barbara; Bluhm, Bodil; Gabrielsen, Tove M.; Peeken, Ilka. (2016) Arctic Ocean winter ecology – the Big Black Box. 3rd Arctic Observing Summit 2016-03-12 - 2016-03-18
  • Intervju
    Ødegård, Øyvind; Berge, Jørgen; Johnsen, Geir; Støbakk, Torun. (2016) Skrekklarven var båtfolkets mareritt. Dagbladet Dagbladet [Avis] 2016-03-01
  • Programdeltagelse
    Johnsen, Geir. (2016) Nye arter funnet på Svalbard. NRK P1 NRK P1 [Radio] 2016-02-23
  • Programdeltagelse
    Johnsen, Geir. (2016) Liv i Polarnatta. NRK P1 NRK P1 [Radio] 2016-02-29
  • Intervju
    Ødegård, Øyvind; Johnsen, Geir. (2016) Utforsker havets dyp. UiT The Arctic University of Norway UiT The Arctic University of Norway [Internett] 2016-02-03
  • Intervju
    Nornes, Stein Melvær; Johnsen, Geir. (2016) Easier automated visual mapping of biodiversity. Geoconnection.com Geoconnection.com [Fagblad] 2016-11-30
  • Dokumentar
    Johnsen, Geir. (2016) Kings Bay 100 år. NRK NRK [TV] 2016-12-20
  • Programdeltagelse
    Sørbø, Kari; Johnsen, Geir. (2016) NRK P1+ Frokostradio - "Liv i Polarnatta". NRK P1+ Frokostradio NRK P1+ Frokostradio [Radio] 2016-02-29
  • Intervju
    Flå, Ellen; Johnsen, Geir. (2016) God morgen Trøndelag - Polarnatt. NRK P1 NRK P1 [Radio] 2016-02-23
  • Intervju
    Eirik, Palm; Berge, Jørgen; Johnsen, Geir. (2016) Fant dypvannsfisk på grunna. Svalbardposten Svalbardposten [Avis] 2016-01-29
  • Intervju
    Opar, Alisa; Berge, Jørgen; Johnsen, Geir. (2016) Meet the Night Creatures of the Warming Arctic. Audobon Magazine Audobon Magazine [Tidsskrift] 2016-01-01
  • Intervju
    Aarskog, Karine Nigar; Ødegård, Øyvind; Johnsen, Geir; Berge, Jørgen. (2016) Undervannsrobot som oppfyller tre ønsker. forskning.no forskning.no [Internett] 2016-02-16
  • Intervju
    Ødegård, Øyvind; Johnsen, Geir; Berge, Jørgen. (2016) Dark lords, werewolves and Indiana Jones in the polar night. Science Nordic Science Nordic [Internett] 2016-03-19
  • Intervju
    Berge, Jørgen; Kintish, Eli; Ødegård, Øyvind; Johnsen, Geir. (2016) Arctic shipworm discovery alarms archaeologists. Science Science [Tidsskrift] 2016-02-26

2015

  • Vitenskapelig foredrag
    Ludvigsen, Martin; Thorsnes, Terje; Hansen, Roy Edgar; Sørensen, Asgeir Johan; Johnsen, Geir; Lågstad, Petter Arthur. (2015) Underwater vehicles for environmental management in coastal areas. IEEE/MTS OCEANS 2015 , Genova 2015-05-18 - 2015-05-21
  • Intervju
    Lingenhöhl, Daniel; Berge, Jørgen; Johnsen, Geir. (2015) Highlife in der Polarnacht. Spektrum Spektrum [Tidsskrift] 2015-09-25
  • Intervju
    Webb, Jonathan; Berge, Jørgen; Johnsen, Geir. (2015) Arctic ocean's wakeful winter revealed. BBC News BBC News [TV] 2015-09-24
  • Poster
    Vogedes, Daniel Ludwig; Berge, Jørgen; Daase, Malin; Johnsen, Geir; Darnis, Gérald; Last, Kim S.. (2015) Expect the unexpected - a new perspective and understanding of marine life at high latitudes. Gordon Gordon Research Conference and Seminar on Polar Marine Science , Lucca 2015-03-14 - 2015-03-20

2014

  • Faglig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2014) Varulver i polarnatta. NTVA NTVA-/NVP-seminar i Trondheim , Trondheim 2014-11-25 - 2014-11-25
  • Vitenskapelig foredrag
    Ødegård, Øyvind; Johnsen, Geir; Sørensen, Asgeir Johan. (2014) Use of Underwater Hyperspectral Imager (UHI) in Marine Archaeology. Ocean Optics Conferences Ocean Optics XXII , Portland, Maine 2014-10-26 - 2014-10-31
  • Populærvitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen. (2014) Varulvene kommer!. UNIS og NPI Svalbard seminaret , Longyearbyen 2014-02-01 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2014) KOMPiS (Kompetanse i Skolen) Biodiversitet - Trondheimsfjorden . PLU NTNU Kompetanse i skolen (KOMPiS) , Trondheim 2014-09-02 - 2014-09-02
  • Vitenskapelig foredrag
    Johnsen, Geir. (2014) Underwater hyperspectral imagery for seafloor mapping - now and future perspectives. Curtin University and Aust Meterological & Oceanogr Society Seminar at Curtin University, Perth Western Australia , Perth 2014-03-26 - 2014-03-26
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan; Berge, Jørgen. (2014) Underwater robots & sensors in the Polar night. NTNU AUR-Lab Worshop in underwater robotics , Clarion Hotell & Congress, Trondheim 2014-03-03 - 2014-03-04
  • Dokumentar
    Ekra, Siv Ingrid Skau; Candeloro, Mauro; Dukan, Fredrik; Sørensen, Asgeir Johan; Ludvigsen, Martin; Johnsen, Geir. (2014) ROV-drift på havbunnen. Gemini.no Gemini.no [Fagblad] 2014-02-19
  • Vitenskapelig foredrag
    Johnsen, Geir; Berge, Jørgen. (2014) "Varulvene kommer". Norw Academy of Polar Res (NAPR) & Techn Sci (NTVA) Seminar Norw Academy of Polar Res (NAPR) & Techn Sci (NTVA) , Lerchendal Gård Trondheim 25 Nov 2014 2014-11-25 - 2014-11-25
  • Faglig foredrag
    Johnsen, Geir. (2014) Perspektiv fra en faglig ansatt. Strategiske partnerskap og allianser – hva får vi ut av dem – case NORUS . Senter for høyere utdanning i Norge (SiU) Internasjonaliseringskonferansen 2014, Trondheim 5-6 mars 2014 , Trondheim - Studentersamfunnet 2014-03-05 - 2014-03-06
  • Intervju
    Candeloro, Mauro; Dukan, Fredrik; Ludvigsen, Martin; Sørensen, Asgeir Johan; Johnsen, Geir; Ekra, Siv Ingrid Skau. (2014) Smarte roboter tar nye bilder av havbunnen. Universitetsavisa.no & Forskning.no Universitetsavisa.no & Forskning.no [Fagblad] 2014-02-19
  • Intervju
    Johnsen, Geir; Hansen, Ingrid; Hanssen, Christian. (2014) Dette kameraet kan bli det nye ekkoloddet – Ser flere farger enn det menneskelige øyet. Teknisk Ukeblad Teknisk Ukeblad [Fagblad] 2014-03-26
  • Vitenskapelig foredrag
    Bones, Atle M.; Nymark, Marianne; Valle, Kristin Collier; Winge, Per; Brembu, Tore; Johnsen, Geir. (2014) System responses to equal doses of photosynthetically usable radiation of blue, green and red light in the diatom Phaeodactylum tricornutum. Society for Experimental Biology SEB 2014 , Manchester 2014-06-30 - 2014-07-04

2013

  • Vitenskapelig foredrag
    Ødegård, Øyvind; Sørensen, Asgeir Johan; Johnsen, Geir. (2013) Towards Autonomy in Marine Archaeology. Øhavsmuseet og Syddansk Universitet Nordisk Konference for Marinarkæologi , Rudkøbing 2013-10-24 - 2013-10-25
  • Vitenskapelig foredrag
    Johnsen, Geir; Hansen, Ingrid; Ekehaug, Stefan. (2013) Identification, mapping & monitoring of underwater habitats using Underwater Hyperspectral Imager (UHI) on robots. DNV-GL Workshop on sea bed habitats of environmental concern , Høvik 2013-10-17 - 2013-10-18
  • Intervju
    Ødegård, Øyvind; Johnsen, Geir. (2013) "Denne vekker interesse hos NASA og US Navy" innslag på NRK Midtnytt om UHI og arkeologi. NRK NRK [TV] 2013-04-26
  • Vitenskapelig foredrag
    Ludvigsen, Martin; Låge, Petter A.; Johnsen, Geir; Sørensen, Asgeir Johan; Ødegård, Øyvind. (2013) Scientific operations combining ROV and AUV in the Trondheim Fjord. MTS/IEEE OCEANS’13 , Bergen 2013-06-10 - 2013-06-13
  • Programdeltagelse
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Koraller i dypet. Schrødingers Katt NRK Schrødingers Katt NRK [TV] 2013-03-07
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2013) Undervannsroboter i Trondheimsfjorden. Forskningsdagene i Trondheim NTNU Forskningsdagene i Trondheim , FF Gunnerus i Trondheimsfjorden 2013-09-28 - 2013-09-28
  • Vitenskapelig foredrag
    Johnsen, Geir; Ludvigsen, Martin; Sørensen, Asgeir Johan; Moline, Mark A.. (2013) Underwater hyperspectral imagery for identification, mapping and monitoring of bio-geo-chemical features on the sea floor. Blue Photonics 3 2013-03-18 - 2013-03-20
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter - i dypet. Trondheim Rotary Klub Trondheim Rotary Klub , Trondheim 2013-03-06 - 2013-03-06
  • Dokumentar
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter. Nrk 2 Kunnkapskanalen Nrk 2 Kunnkapskanalen [TV] 2013-11-16
  • Vitenskapelig foredrag
    Johnsen, Geir; Myrnes Hansen, Ingrid; Ekehaug, Stefan. (2013) Identification, mapping and monitoring of underwater habitats using underwater hyperspectral imager on robots. DNV Workshop on Sea Bed Habitats of Environmental Concern 2013 , Høvik 2013-10-17 - 2013-10-18
  • Vitenskapelig foredrag
    Johnsen, Geir. (2013) Marine Arctic environment- a quick overview. UNIS, FFI, Kongsberg Maritime, NTNU MCD Workshop in underwater technology & operations, UNIS 10-12 April 2013 , Longyearbyen, Svalbard 2013-04-10 - 2013-04-12
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2013) Trondheimsfjordens hemmeligheter. NTNU Kunnskapsbyen , Trondheim 2013-09-07 - 2013-09-07
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Underwater remote sensing – mapping & monitoring of marine life. Direktoratet for naturforvaltning Workshop on habitat mapping and time-series in coastal Norway and Svalbard , Universitetssentret på Svalbard (UNIS) 2013-02-05 - 2013-02-07
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2013) Ny teknologi for utforskning av havrommet. Årssamling FHL Midtnorsk Havbrukslag Årssamling FHL Midtnorsk Havbrukslag , Trondheim 2013-02-14 - 2013-02-14
  • Intervju
    NRK, P2; Johnsen, Geir; Berge, Jørgen. (2013) Liv I polarnatten – 14 min Podcast , del 2 av 2. NRK - Ekko (P2) NRK - Ekko (P2) [Radio] 2013-01-28
  • Vitenskapelig foredrag
    Johnsen, Geir; Moline, Mark A.; Ludvigsen, Martin; Berge, Jørgen; Sørensen, Asgeir Johan. (2013) Use of underwater robots and sensors to identify, map, monitor biomass & production in the Arctic. Arctic Frontiers Arctic Frontiers , Tromsø 2013-01-20 - 2013-01-25
  • Intervju
    NRK, P2; Johnsen, Geir; Berge, Jørgen. (2013) Liv i polarnatten (del 1 av 2) i Ekko. NRK - Ekko (P2) NRK - Ekko (P2) [Radio] 2013-01-21

2012

  • Vitenskapelig foredrag
    Båtnes, Anna Solvang; Berge, Jørgen; Johnsen, Geir; Miljeteig, Cecilie. (2012) In situ light responses of high Arctic Calanus spp. Lewis Conference Services International Ocean Optics 2012 , Glasgow 2012-10-08 - 2012-10-12
  • Vitenskapelig foredrag
    Ødegård, Øyvind; Ludvigsen, Martin; Johnsen, Geir; Sørensen, Asgeir Johan; Ekehaug, Stefan; Dukan, Fredrik. (2012) Managing data from multiple sensors in an interdisciplinary research cruise. University of Southampton CAA 2012 (Computer Applications and Quantitative Methods in Archaeology ) , Southampton 2012-03-26 - 2012-03-29
  • Vitenskapelig foredrag
    Johnsen, Geir. (2012) In situ and remote sensing of phytoplankton pigments – some examples of detecting pigment-signatures using different platforms and optical sensors. SYKE – centre Marine Environmental Monitoring, Helsinki Final PROTOOL meeting at SYKE – “Marine Environmental Monitoring Methods , Helsinki 2012-08-28 - 2012-08-31
  • Populærvitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) Marine undervannsroboter og sensorer til havovervåkning. Gløshaugen Akademiske Klubb, NTNU Luncheseminar Gløshaugen Akademiske Klubb, NTNU , Gløshaugen Akademiske Klubb, NTNU 2012-01-26 - 2012-01-26
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) NTNU´s kobling naturvitenskap/teknologi gir nøkkelrolle for havrom-utforskning via NTNU MCD. NTNU Marine Coastal Development NTNU Marine coastal development strategiseminar , Hovde Gård, Sør Trøndelag 2012-01-11 - 2012-01-12
  • Vitenskapelig foredrag
    Johnsen, Geir; Moline, Mark A.; Berge, Jørgen; Sørensen, Asgeir Johan. (2012) Underwater mapping and monitoring in the Arctic. Workshop in Underwater Technology and operations. NTNU AUR-Lab, UNIS og FFI Workshop in Underwater Technology and operations , UNIS Longyearbyen 2012-03-19 - 2012-03-21
  • Vitenskapelig foredrag
    Johnsen, Geir; Moline, Mark A.; Berge, Jørgen; Schofield, Oscar. (2012) Technology and science development for marine monitoring and ocean observation. NTNU AUR-Lab, UNIS og FFI Workshop in Underwater Technology and operations , UNIS, Longyearbyen 2012-03-19 - 2012-03-21
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2012) Trondheimsfjordens hemmeligheter – I dypet. Kunnskapsbyen, NTNU Kunnskapsbyen, NTNU , Sumhuset, Vitenskapsmuseet, NTNU 2012-10-24 - 2012-10-24
  • Intervju
    opland, egil M; Johnsen, Geir. (2012) Fjernstyrt ubåt kartlegger fjorden. Adresseavisen Adresseavisen [Avis] 2012-11-05
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2012) UHI based mapping of habitats and organisms on the seabed. NGU International workshop on seabed mapping methods and technology , NGU Trondheim 2012-10-17 - 2012-10-18
  • Vitenskapelig foredrag
    Båtnes, Anna Solvang; Miljeteig, Cecilie; Berge, Jørgen; Johnsen, Geir. (2012) Light responses of Arctic zooplankton during the polar night. Ocean Optics, The Oceanographic Society Ocean Optics Conference XXI , Glasgow 2012-10-07 - 2012-10-12
  • Vitenskapelig foredrag
    Hovland, Erlend Kjeldsberg; Dierssen, Heidi; Johnsen, Geir. (2012) Emiliania huxleyi in the Barents Sea. Ocean Optics, the Oceanographic Society Ocean Optics Conference XXI , Glasgow 2012-10-07 - 2012-10-12
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2012) Marine undervannsroboter og sensorer til havovervåkning. Inst for biologu, NTNU Luncheseminar Institutt for biologi , Realfagsbygget, NTNU 2012-02-03 - 2012-02-03
  • Vitenskapelig foredrag
    Johnsen, Geir. (2012) Marine biology and TBS- Marine underwater robots & sensors. NTNU Marine Science Seminar, Dept biology NTNU Marine Science Seminar , Trondhjem biologiske stasjon, NTNU 2012-02-23 -

2011

  • Vitenskapelig foredrag
    Johnsen, Geir. (2011) The use of a underwater hyperspectral imager to map and monitor bio-geo-chemical object of interest on seafloor. Australian Meterological & Oceanographic Society Australian Meterological & Oceanographic Society symposium , University of Western Australia, Perth, Western Australia. 2011-05-04 - 2011-05-04
  • Vitenskapelig foredrag
    Moline, Mark A.; Johnsen, Geir; Berge, Jørgen. (2011) Technology Development for marine monitoring and oceran observation – a SiU funded research based educational program between US and Norway. Royal Norwegian Embassy Transatlantic Science Week, UC Berkeley , University of California Berkeley, San Francisco 2011-10-25 - 2011-10-27
  • Vitenskapelig foredrag
    Johnsen, Geir; Ardelan, Murat Van. (2011) Underwater monitoring of bio-geo-chemical objects of interest using underwater hyperspectral imagery. Royal Norwegian Embassy Transatlantic Science Week , University of California Berkeley, San Francisco 2011-09-25 - 2011-09-26
  • Vitenskapelig foredrag
    Johnsen, Geir; Sørensen, Asgeir Johan. (2011) Applied Underwater Robotics Laboratory – A new view of subsea applications. The Society for Underwater Technology (AiUT) and The Austral The Society for Underwater Technology (AiUT) and The Australian Hydrographic Society. , Perth 2011-11-03 - 2011-11-03
  • Vitenskapelig foredrag
    Berge, Jørgen; Moline, Mark; Johnsen, Geir. (2011) NORUS – Research-based educational field studies using new sensors for mapping of water surface, column and sea-floor. Royal Norwegian Embassy Transatlantic Science Week, UC Berkeley , University of California Berkeley, San Francisco 2011-10-25 - 2011-11-27
  • Dokumentar
    Sørensen, Asgeir Johan; Ludvigsen, Martin; Ellingsen, Harald; Johnsen, Geir. (2011) NTNU best på bunnen (åpning av NTNU Applied Underwater Robotics Laboratory, 23 aug 2011 med Trond Giske). Adresseavisen Adresseavisen [Avis] 2011-08-24
  • Intervju
    Johnsen, Geir. (2011) “Nordmøringer I Australia” - Lars Djupegot møter Geir Johnsen i Perth. Tidens Krav TV Tidens Krav TV [TV] 2011-03-25
  • Intervju
    Johnsen, Geir. (2011) For gründerpris? NTNU´s spin-off selskap Ecotone i finalen. Tidens Ktrav Tidens Ktrav [Avis] 2011-05-02
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2011) Planktonalger – fra fjernmåling til gener. Artsdatabanken NATUR 2011, Artsdatabankens konferanse om biologisk mangfold , Royal Garden Hotell, Trondheim 2011-11-15 - 2011-11-15
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2011) Romteknologi under havoverflaten – Undervannsroboter med optiske sensorer for deteksjon av bio-geo-kjemiske objekter av interesse. Norske Havforskers Forening Havforskermøte 2011 , Royal Garden Hotell, Trondheim 2011-11-16 - 2011-11-17
  • Intervju
    Johnsen, Geir. (2011) Som fisken I vannet – forskere fra Nordmøre. Tidens Krav Tidens Krav [Avis] 2011-01-01
  • Vitenskapelig foredrag
    Lynch, Mervin; Hedley, John; Klonowski, Wojchiech; Slivkoff, Matt; Johnsen, Geir; Fearns, Peter. (2011) Remote sensing of the eutrophic state of coastal waters via phytoplankton functional groups. ICRSE, ISPRS, SSS, CSIRO, International Symposium on Remote Sensing of Environment , Sydney 2011-04-10 - 2011-04-15
  • Vitenskapelig foredrag
    Johnsen, Geir. (2011) Underwater hyperspectral imaging of Great Barrier Reef corals. Australia Museum, Lizard Island Research Station Lizard Island Research seminar, Australian Museum , Lizard Islands, Queensland, Australia 2011-01-18 - 2011-01-18
  • Vitenskapelig foredrag
    Johnsen, Geir. (2011) The use of a underwater hyperspectral imagery to map bio-geo-chemical objects of interest on seafloor. Curtin University of Technology Imaging and Phycics seminar series. , Perth 2011-05-25 - 2011-05-25
  • Vitenskapelig foredrag
    Johnsen, Geir. (2011) The use of underwater robotics and underwater hyperspectral imagery to map and monitor marine bio-diversity. Dept. Marine Science, Auckland Univeresity, New Zealand. School of Biology Sciences seminars , Auckland 2011-05-31 - 2011-05-31

2010

  • Poster
    Hovland, Erlend Kjeldsberg; Hancke, Kasper; Volent, Zsolt; Johnsen, Geir; Sakshaug, Egil. (2010) cDOM in the Barents Sea. Ocean Optics, The Oceanographic Society Ocean Optics XX , Anchorage 2010-09-27 - 2010-10-01
  • Vitenskapelig foredrag
    Hovland, Erlend Kjeldsberg; Hancke, Kasper; Høkedal, Jo; Johnsen, Geir; Moline, Mark; Sakshaug, Egil. (2010) An in situ bio-optical study of Emiliania huxleyi in the Barents Sea. the International Polar Year (IPY) Oslo Science Conference (OSC) , Oslo 2010-06-08 - 2010-06-12
  • Vitenskapelig foredrag
    Dierssen, Heidi; Johnsen, Geir; Cummings, Molly; Maginnis, Tara; Holt, J.. (2010) Spectral polarized reflectance from skin preparations from four different subtropical fish species. Ocean Optics Ocean Optics conference OOXX , Anchorage, Alaska 2010-09-27 - 2010-10-01
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Moline, Mark; Jenssen, Eva Therese. (2010) Morgendagens miljøovervåkere. http://www.forskning.no/artikler/2010/mars/245803 http://www.forskning.no/artikler/2010/mars/245803 [Internett] 2010-03-31
  • Dokumentar
    Johnsen, Geir; Rapp, Ole Magnus. (2010) Undervannsroboter studerer livet i ishavet. Aftenposten Aftenposten [Avis] 2010-02-15
  • Vitenskapelig foredrag
    Hancke, Kasper; Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark; Sakshaug, Egil. (2010) The Underwater Light Regime and cDOM across the Polar Front (Barents Sea):With relevance for the Primary Production. International Polar Year (IPY) Oslo Science Conference (OSC) , Oslo 2010-06-08 - 2010-06-12
  • Dokumentar
    Berge, Jørgen; Johnsen, Geir; Moline, Mark. (2010) Into the deep, dark polar night waters. Description of NORUS expedition in Polar night, Kongsfjorden Jan 2010.Nettartikkel, Svalbard Science Forum. http://www.ssf.npolar.no/pages/news355.htm http://www.ssf.npolar.no/pages/news355.htm [Internett] 2010-03-26
  • Dokumentar
    Schofield, Oscar; Moline, Mark; Johnsen, Geir. (2010) "Robots: AUV Missions" Interview with Oscar Schofield and Mark Moline NORUS- program. www.robotspodcast.com. www.robotspodcast.com. [Internett] 2010-02-12
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Moline, Mark. (2010) Morgendagens overvåkere. Schrødingers Katt. Schrødingers KattNRK 1 Schrødingers KattNRK 1 [TV] 2010-03-25
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Moline, Mark. (2010) NORUS – Technology development for marine monitoring and ocean observation. http://siu.no/no/Programoversikt/Utdanningssamarbeid-med-Nor http://siu.no/no/Programoversikt/Utdanningssamarbeid-med-Nor [Internett] 2010-01-01
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Moline, Mark; Jenssen, Eva Therese. (2010) The climate watchdogs of tomorrow. http://www.unis.no/60_NEWS/6060_Archive_2010/n_10_03_25_new_ http://www.unis.no/60_NEWS/6060_Archive_2010/n_10_03_25_new_ [Internett] 2010-03-25

2009

  • Vitenskapelig foredrag
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Winge, Per; Johnsen, Geir; Bones, Atle M.. (2009) Molecular mechanisms behind acclimation to high light conditions for the marine diatom Phaeodactylum tricornutum. CMB seminar series 2009-03-03 - 2009-03-03
  • Vitenskapelig foredrag
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2009) En integrert analyse av molekylær akklimatisering til sterkt lys i kiselalgen Phaeodactylum tricornutum. Norsk institutt for vannforskning Algesymposium 2009 , CIENS, Forskningsparken, Oslo 2009-11-25 - 2009-11-26
  • Poster
    Nymark, Marianne; Valle, Kristin Collier; Brembu, Tore; Hancke, Kasper; Winge, Per; Andresen, Kjersti. (2009) Molecular mechanisms behind acclimation to high light conditions for the marine diatom Phaeodactylum tricornutum. American Society for Plant Biologists Plant Biology 2009 , Honolulu, Hawaii 2009-07-18 - 2009-07-22
  • Poster
    Nymark, Marianne; Valle, Kristin Collier; Hancke, Kasper; Andresen, Kjersti; Brembu, Tore; Johnsen, Geir. (2009) Global physiological and expression adaptation to changes in light condition in the diatom Phaeodactylum tricornutum. Norsk Biokjemisk Selskap 45th Contact Meeting of the Norwegian Biochemical Society , Røros 2009-01-29 - 2009-02-01
  • Poster
    Bones, Atle M.; Valle, Kristin Collier; Hancke, Kasper; Andresen, Kjersti; Brembu, Tore; Johnsen, Geir. (2009) Mining for genes, proteins, metabolites, nanoscale structures and molecular machinery of marine algae. UITø/NTNU/SINTEF Bioprosp2009 , Tromsø 2009-02-24 - 2009-02-25

2008

  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2008) A window into endosymbiotic adaptation - from organelle to cell in photosynthetic phycozoans. Norske havforskeres forenings årsmøte , Tromsø 2008-11-05 - 2008-11-07
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Overraskende funn i Arktis - Pikoplankton. http://www.nrk.no/programmer/tv/schrodingers_katt/1.6252692 http://www.nrk.no/programmer/tv/schrodingers_katt/1.6252692 [Internett] 2008-10-02
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Klimaendringer, er de menneskeskapt?. http://www1.nrk.no/nett-tv/klipp/414199 http://www1.nrk.no/nett-tv/klipp/414199 [Internett] 2008-09-25
  • Dokumentar
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove. (2008) På tokt i polhavet. http://www1.nrk.no/nett-tv/indeks/146194 http://www1.nrk.no/nett-tv/indeks/146194 [Internett] 2008-10-02
  • Dokumentar
    Johnsen, Geir. (2008) Svamper mot blodkreft. http://www.nrk.no/nyheter/distrikt/nrk_trondelag/1.6272545 http://www.nrk.no/nyheter/distrikt/nrk_trondelag/1.6272545 [Internett] 2008-10-20
  • Programdeltagelse
    Johnsen, Geir; Zotchev, Sergey. (2008) Svamper mot blodkreft. NRK Frokost TV NRK Frokost TV [TV] 2008-10-21
  • Programdeltagelse
    Johnsen, Geir; Zotchev, Sergey. (2008) Svamper mot blodkreft -NTNUs rolle. NRK Trøndelag TV NRK Trøndelag TV [TV] 2008-10-20
  • Programdeltagelse
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) På tokt i polhavet med UNIS. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/419912 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/419912 [TV] 2008-10-02
  • Programdeltagelse
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Klimaendringer, er de menneskeskapt?. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/414199 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/414199 [TV] 2008-09-25
  • Programdeltagelse
    Johnsen, Geir; Berge, Jørgen; Gabrielsen, Tove M.. (2008) Pikoplankton i Polhavet. Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/42182 Schrødingers katt. http://www1.nrk.no/nett-tv/klipp/42182 [TV] 2008-10-09
  • Intervju
    Johnsen, Geir. (2008) På vannets betingelser (Universitetsavisa). http://www.universitetsavisa.no/ua_lesmer.php?kategori=nyhet http://www.universitetsavisa.no/ua_lesmer.php?kategori=nyhet [Internett] 2008-09-15
  • Intervju
    Johnsen, Geir; Berge, Jørgen; Thoen, Hanne. (2008) Polhavets piraya. http://www.nrk.no/programmer/tv/schrodingers_katt/1.6277121 http://www.nrk.no/programmer/tv/schrodingers_katt/1.6277121 [Internett] 2008-10-23
  • Poster
    Hovland, Erlend Kjeldsberg; Johnsen, Geir; Moline, Mark. (2008) Combining AUV and hyperspectral imaging in coastal monitoring. Ocean Optics Society Ocean Optics conference , Barga, Italia 2008-10-06 - 2008-10-10
  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2008) A window into endosymbiotic adaptation - from organelle to cell in photosynthetic phycozoans. Norske havforskeres forenings årsmøte , Tromsø 2008-11-05 - 2008-11-07

2007

  • Poster
    Johnsen, Geir; Volent, Zsolt; Sigernes, Fred; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. Arctic Frontiers , Tromsø 2007-01-16 - 2007-01-21
  • Dokumentar
    Jarvis, L. M.; Johnsen, Geir; Zotchev, Sergey. (2007) Liquid gold mine - Scientist in Norway are plumbing the seas for the next blockbuster medicine. Chemical and engineering news. Vol 85:22-28. http://pubs.acs.org/subscribe/journals/cen/85/i41/toc/toc_i4 http://pubs.acs.org/subscribe/journals/cen/85/i41/toc/toc_i4 [Internett] 2007-10-01
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Makroalgeforskning ved TBS-IBI. Integrate SIP konferanse , Trondheim 2007-11-26 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Marine bio-optics. NTNU , Trondheim 2007-02-20 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Bruk av nye plattformer til tverrfaglig marin forskning ved NTNU. NFR Havet og Kysten , Trondheim 2007-04-12 -
  • Vitenskapelig foredrag
    Johnsen, Geir; Sakshaug, Egil. (2007) Application of in vivo fluorescence excitation spectra from different pigment-groups of phytoplankton. AquaFluo , Nove Hrady 2007-05-31 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Bio-optikk til bruk i fjernmåling og in situ detektering av forskjellige biologiske komponenter i Trondheimsfjorden. NTNU-SINTEF Marin kystutvikling , Brekstad 2007-04-17 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Hyperspectral monitoring of ocean colour. Norwegian Academy of Science and Letters, Statoil VISTA , Oslo 2007-02-06 -
  • Vitenskapelig foredrag
    Johnsen, Geir; Volent, Zsolt; Sigernes, F.. (2007) Fine scale studies using hyper-spectral remote sensing. ESSAS meeting in marine Arctic climate , Hakodate, Hokkaido 2007-06-04 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2007) Overvåkning, kartlegging av marine ressurser ved hjelp av optikk, akustikk og telemetri. Statoil Hydro , Rotvoll forskningssenter, Trondheim 2007-11-27 -
  • Poster
    Brembu, Tore; Valle, Kristin Collier; Størseth, T.R.; Østensen, Mari-Ann; Bjørk, Camilla; Andresen, Kjersti. (2007) The DIABOL project – mining for nanoscale structures and machinery of the diatom silica shell. Nanomat konferanse 2007-03-08 - 2007-03-08
  • Poster
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir. (2007) Temperature effects on photosynthesis-light responses measured by O2 evolution, pulse amplified modulated (PAM) fluorescence and 14C assimilation. AquaFluo Conference , Nove Hrady 2007-05-28 - 2007-06-01
  • Poster
    Johnsen, Geir; Volent, Zsolt; Sigernes, F.; Berge, Jørgen; Hovland, Erlend Kjeldsberg; Sakshaug, Egil. (2007) Local hyperspectral imaging of ocean colour from tethered balloons in the Arctic. Arctic Frontiers Conference , Tromsø 2007-01-16 - 2007-01-21
  • Poster
    Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2007) Rate of O2 production from PAM fluorescence: Testing three bio-optical approaches against measured O2 production rate. AquaFluo Conference , Nove Hrady 2007-05-28 - 2007-06-01

2006

  • Vitenskapelig foredrag
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir; Glud, Ronnie N. (2006) Temperature effects on photosynthesis: Measurements using O2-microelectrodes, Pulse Amplitude Modulated (PAM) fluorescence and 14C-incorporation techniques. Norske havforskeres forening Annual meeting at the Association of Norwegian Oceanographers , Oslo 2006-11-01 - 2006-11-03
  • Vitenskapelig foredrag
    Johnsen, Geir. (2006) Nye tider for foto-opto-molekylo (FOM) biologi. IBI meeting, NTNU 2006-08-31 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2006) Monitoring of phytoplankton on coastal areas. UNESCO SCOR Meeting , Monte Carlo 2006-04-09 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2006) Marine Biology ?. IBI meeting, NTNU 2006-11-08 -
  • Programdeltagelse
    Johnsen, Geir. (2006) Medisin fra havet. Schrødingers Katt Schrødingers Katt [TV] 2006-03-23
  • Poster
    Hancke, Torunn Beate; Hancke, Kasper; Johnsen, Geir; Sakshaug, Egil. (2006) The use of PAM fluorescence and bio-optical characteristics to estimate oxygen production in phytoplankton. Norke havforskeres forening Annual meeting at the Association of Norwegian Oceanographers , Oslo 2006-11-01 - 2006-11-03

2005

  • Programdeltagelse
    Johnsen, Geir; Bordvik, Hans Otto. (2005) Forskning og foto under vann. (GJ underwater video and comments). Newton. [TV] 2005-09-18
  • Programdeltagelse
    Johnsen, Geir. (2005) Er det mulig å se alger fra satelitt?. [Radio] 2005-02-10
  • Programdeltagelse
    Johnsen, Geir; Zotchev, Sergey; Moore, Thomas. (2005) The medical gold rush. Sky News (England). 7 min program of NTNU´s bioprospecteering NFR project “Marine actinopmycetes”. Kew words with NTNU´s ROV to harvest songes to isolate new type of antiobiotica from sponges in the Trondheimsfjord. [TV] 2005-10-31
  • Vitenskapelig foredrag
    Johnsen, Geir. (2005) "Forskning og foto under vann” Fotoptip of GJ.www.nrk.no/programmer/TV/Newton´s hjemmside Publ. 1409 and updated 210905. NRK Newton spesial (NRK news website) 2005-09-18 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2005) Kunnskapsstatus om marine økosystem I Norge 2005. NFR headquarters Meeting in “Havet og kysten” , Oslo 2005-04-21 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2005) Evidence of global warming became so overwhelming in 2004, now the question is: What can we do about it. Vol 26, No 1 (see MEPS 303). Discover magazine (Jan issue by R. Kunzig). 2005-12-01 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2005) "Forskning og foto under vann” Fotoptip of GJ.www.nrk.no/programmer/TV/Newton´s hjemmside Publ. 1409 and updated 210905. NRK Newton spesial (NRK news website) 2005-09-21 -
  • Vitenskapelig foredrag
    Edvardsen, Bente; Eikrem, Wenche; Shalchian-Tabrizi, Kamran; Riisberg, Ingvild; Johnsen, Geir; Naustvoll, Lars. (2005) Phylogeny of a new ichthyotoxic dictyochophyte forming blooms in the North Sea. CNRS SBR Seminarserie ved CNRS Station Biologique de Roscoff , Station Biologique de Roscoff 2005-09-26 -
  • Poster
    Hancke, Kasper; Hancke, Torunn Beate; Olsen, Lasse Mork; Johnsen, Geir. (2005) Temperature effects on photosynthesis-light responses measured by O2-evolution, 14C-assimilation and Pulse Amplitude Modulated (PAM) fluorescence. Am. Soc. Limnol. Oceanogr. (ASLO) Am. Soc. Limnol. Oceanogr. (ASLO) conference , Santiago de Compostela 2005-06-19 - 2005-06-24
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2005) Introduction & overview of Marine Ecosystems to NFR. “Kunnskapsstatus om marine økosystem I Norge 2005”. NFR headquarters Meeting in “Havet og kysten” , Oslo 2005-04-21 -

2004

  • Vitenskapelig foredrag
    Edvardsen, Bente; Eikrem, Wenche; Johnsen, Geir; Shalchian-Tabrizi, Kamran; Riisberg, Ingvild; Naustvoll, Lars. (2004) Phylogeny of a new ichthyotoxic dictyochophyte forming blooms in the Skagerrak. ISSHA 11th International Conference on Harmful Algae , Cape Town 2004-11-14 - 2004-11-19
  • Vitenskapelig foredrag
    Johnsen, Geir. (2004) Light utilzation in 13 different pigments groups of phytoplankton. American Society of Limnology and Oceanography Foredrag , Honolulu, Hawaii 2004-02-15 - 2004-02-20
  • Vitenskapelig foredrag
    Johnsen, Geir. (2004) Presentation of SISCAL and the use of remote sensing. SISCAL (EU), NTNU, Fylkesmannen i Sør-Trøndelag Foredrag , Trondheim 2004-09-28 - 2004-09-28
  • Vitenskapelig foredrag
    Johnsen, Geir; Hancke, Torunn Beate. (2004) SISCAL processor evaluation. SISCAL (EU prosjekt) Fordrag , NTNU 2004-07-05 - 2004-07-08
  • Vitenskapelig foredrag
    Forbord, Silje; Johnsen, Geir. (2004) Marine bio-prospecteering of marine macroalgae. MARBIN (NFR) Foredrag , Trondheim 2004-09-01 - 2004-09-02
  • Vitenskapelig foredrag
    Johnsen, Geir; Evertsen, Jussi. (2004) Photosynthetic Opisthobranchs. European Large Scale Fascility meeting (EU) Foredrag 2004-04-19 - 2004-04-20
  • Vitenskapelig foredrag
    Johnsen, Geir; Hancke, Torunn Beate. (2004) SISCAL dissemination evaluation. EU kommisjonen i Brussel Foredrag , Brussel 2004-12-13 - 2004-12-13
  • Vitenskapelig foredrag
    Johnsen, Geir; Evertsen, Jussi. (2004) Photosynthetic Nudibranchs and Sacoglossans. International Ocean Optics Society Foredrag/poster , Fremantle, W-Australia 2004-10-25 - 2004-10-29
  • Vitenskapelig foredrag
    Edvardsen, Bente; Eikrem, Wenche; Johnsen, Geir; Naustvoll, L.; Riisberg, I.; Shalchian-Tabrizi, K.. (2004) Verruca fascima gen. et. sp. nov. (Dictyochophyceae, Heterokontophyta) a bloom forming ichthyotoxic flagellate isolated from Skagerrak, Norway. UNESCO Foredrag , Cape Town 2004-11-01 - 2204-11-05
  • Vitenskapelig foredrag
    Olsen, Lasse Mork; Øzturk, Murat; Sakshaug, Egil; Vadstein, Olav; Sandaa, Ruth Anne; Johnsen, Geir. (2004) Interactions between metabolism, geochemistry and bacterial diversity in cultures of the marine dinoflagellate Prorocentrum minimum. American Society for Limnology and Oceanography ASLO møte , Honolulu, Hawaii 2004-02-15 - 2004-02-20
  • Vitenskapelig foredrag
    Bredholt, Harald; Fjærvik, E.; Hakvåg, Sigrid; Sletta, Håvard; Johnsen, Geir; Ellingsen, Trond Erling. (2004) Mining for antibiotic-producing bacteria in the Trondheim fjord. BIOPROS 2004 , Tromsø 2004-10-12 - 2004-10-14
  • Poster
    Bredholt, Harald; Fjærvik, Espen; Johnsen, Geir; Hancke, Torunn Beate. (2004) Isolation and characterization of actinomycete bacteria from sediments in the Trondheimsfjord, Norway. GMBIM/BMP , San Diego 2004-11-14 - 2004-11-18
  • Poster
    Bredholt, Harald; Fjærvik, E.; Johnsen, Geir; Johansen, G.; Sletta, Håvard; Ellingsen, Trond Erling. (2004) Isolation and characterization of actinomycete bacteria from sediments in the Trondheimsfjord, Norway. Genetics and Molecular Biology of Industrial Microorganisms conference , San Diego 2004-11-14 - 2004-11-18
  • Poster
    Salvesen, Ingrid; Brakstad, I.; Givskov, M.; Johnsen, Geir; Skindersø, M.; Størseth, Trond. (2004) Antibacterial activity in crude extracts of marine macroalgae. EAS Conference Poster , Barcelona 2004-10-20 - 2004-10-24
  • Poster
    Volent, Z.; Johnsen, Geir; Sigernes, F.. (2004) Comparison study between airborne remote sensing of of ocean colour using hyperspectral imager and in situ measurements of optical properties in surface waters in an Arctic fjord, Svalbard, May 2004. International Ocean Optics Society Poster , Fremantle, W-Australia 2004-10-25 - 2004-10-29
  • Poster
    Berge, J.; Johnsen, Geir; Nilsen, F.; Gulliksen, B.. (2004) Discovery of blue mussels (Mytilus edulis) in Svalbard - indication of temperature increase in the Arctic marine environment. Norske Havforskeres Forening Poster , Trondheim 2004-10-29 - 2004-11-02

2003

  • Poster
    Volent, Z.; Johnsen, Geir. (2003) Presentation of an optical sensor for in situ detection of phytoplankton, inorganic particles and yellow substance. Norske Havforskers Forenings årsmøte , Longyearbyen 2003-10-12 -
  • Poster
    Valle, Kristin Collier; Forbord, Silje; Hilstad, Kari; Evertsen, Jussi; Johnsen, Geir. (2003) Detectation of annual variation in red-, brown- and green macroalgae using in situ video technique and fluorescence microscopy. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Forbord, Silje; Valle, Kristin Collier; Hilstad, Kari; Evertsen, Jussi; Johnsen, Geir. (2003) Annual variation of pigments in marine red-, brown- and green macroalgae. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Johnsen, Geir. (2003) Bio-optical characterization in 10 major phytoplankton classes. Norske Havforskers Forenings årsmøte , Longyearbyen 2003-10-12 -
  • Vitenskapelig foredrag
    Johansen, Torunn Beate; Johnsen, Geir. (2003) SISCAL prototype evaluation. SISCAL Second Annual Meeting , Berlin, Germany 2003-09-20 -
  • Poster
    Hilstad, Kari; Evertsen, Jussi; Forbord, Silje; Valle, Kristin Collier; Johnsen, Geir. (2003) Annual variation in bio-optical characteristics in marine red-, brown-, and green macro algae. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -
  • Poster
    Evertsen, Jussi; Johnsen, Geir. (2003) Opisthobranchs with solar panels. Norske havforskeres forening, årsmøtet , Longyearbyen 2003-10-12 -

2002

  • Poster
    Salvesen, Ingrid; Størseth, Trond; Johnsen, Geir; Brakstad, O.G.. (2002) Bakteriehemmenede forbindelser i marine alger: Utvikling av miljøvennlige strategier for å kontrollere virulens og begroing. Ikke opplyst , Tromsø 2002-09-20 -
  • Poster
    Størseth, Trond; Reitan, Kjell Inge; Salvesen, Ingrid; Skjermo, Jorunn; Rainuzzo, J.; Johnsen, Geir. (2002) Immunostimulants and Antimicrobial Compounds from algae, Isolation and Characterization. Marin bioprospektering , Rica Ishavshotell, Tromsø 2002-02-05 -
  • Poster
    Fell, Frank; Herut, Barak; Johansen, Torunn Beate; Johnsen, Geir; Brozek, Morten; Hanssen, Frank. (2002) SISCAL: internet-based delivery of near-real-time data products on coastal areas and lakes from satellite imagery. SPIE , Hangzhou, China 2002-10-27 -
  • Poster
    Salvesen, Ingrid; Johnsen, Geir; Rainuzzo, J.; Reitan, Kjell Inge; Skjermo, Jorunn; Størseth, Trond. (2002) Immunstimulerende og antibakterielle forbindelser fra marine alger. Marin bioprospektering. Marin bioprospektering , Rica Ishavshotell, Tromsø 2002-02-05 -
  • Poster
    Evertsen, Jussi; Johansen, Torunn Beate; Johnsen, Geir. (2002) MODTEQ Module 2 - bio-optical methods. Model based development of advanced marine equipment. Norske Havforskeres Forenings årsmøte , Bergen 2002-11-02 -
  • Vitenskapelig foredrag
    Fell, Frank; Herut, Barak; Johansen, Torunn Beate; Johnsen, Geir; Brozek, Morten; Hanssen, Frank. (2002) SISCAL project: establishing an internet-based delivery of near-real-time data products on coastal areas and lakes from satellite imagery. SPIE 2002 , Hangzhou, China 2002-10-27 -
  • Vitenskapelig foredrag
    Børsheim, Knut Yngve; Kirkvold, Ståle; Johansen, Torunn Beate; Johnsen, Geir. (2002) Measurement of phytoplankton mortality as a tool to estimate turnover of phytoplankton biomass. Phytoplankton Productivity. An Appreciation of 50 years of the study of oceans and lakes , University of Bangor, N. Wales 2002-03-22 -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2002) End user requirements in SISCAL (EU Romete sensing project). SISCAL meeting , Inst. of Geography, University of Copenhagen, Denmark 2002-01-05 -
  • Populærvitenskapelig foredrag
    Johnsen, Geir. (2002) Queen Maud and myself. Norwegian Antarctic Research Expedition jan-mar 2001. Primary production under the sea ice , NTNU, Trondhjem biologiske stasjon 2002-05-02 -
  • Poster
    Johansen, Torunn Beate; Evertsen, Jussi; Johnsen, Geir. (2002) SISCAL - satellite-based information system on coastal areas and lakes. Norske havforskeres forening, årsmøtet , Bergen 2002-11-02 -

2001

  • Programdeltagelse
    Johnsen, Geir; Johansen, Torunn Beate. (2001) Norsk Antarktis Forsknings Ekspedisjon "Fotosyntese i måneskinn". NRK TV1 NRK TV1 [TV] 2001-09-13
  • Vitenskapelig foredrag
    Ødegaard, Øyvind Tangen; Sortland, Bjørn; Ellingsen, Ingrid Helene; Slagstad, Dag; Johnsen, Geir; Sakshaug, Egil. (2001) An Interdisciplinary Marine Research Programme: How to promote generative interaction between marine scientists, modellers and engineers. OCEANS, 2001. MTS/IEEE Conference and Exhibition , Honolulu, Hawaii 2001-11-08 -

2000

  • Poster
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri and Prymnesium patelliferum (Haptophytae). 9th International conference on Harful Algal Blooms. , 7-11 Februar
  • Poster
    Chauton, Matilde Skogen; Johnsen, Geir; Legrand, C; Graneli, E; Sakshaug, Egil. (2000) Development of a potential harmful algal bloom in mesocosm experiment monitored through pigment analysis and bio-optical measurements. 9th International conference on Harmful Algal Blooms. , 7-11 February
  • Poster
    Johnsen, Geir; Legrand, C; Graneli, C; Sakshaug, Egil. (2000) The use of a DIVING-PAM for detection of irradiance, biomass and photosystem II fluorescence yields in harmful algal bloom experiments: Discussion of methodological aspects. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Poster
    Tilstone, G; Johnsen, Geir; Chauton, Matilde Skogen; Johansen, T; Figueiras, F.G. (2000) Temporal evolution of photosynthetic parameters and primary prodution during a bloom of an ichthytoxic prymnesiophyte under different N/P ratios. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Poster
    Graneli, E; Legrand, C; Carlsson, P; Maestrini, S.Y; Hummert, C; Reichelt, M. (2000) Nitrogen and phosphorus deficiency favours the dominance and toxin content of harmful species in summer Baltic Sea phytoplankton. 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Populærvitenskapelig foredrag
    Mork, Jarle; Johnsen, Geir; Tokle, Nils Egil; Evensen, Jussi; Andresen, Kjersti. (2000) Trondhjem Biologiske Stasjon. Poster presentasjon. Trøndelagsmessa 2000 , Stjørdal, 29/8-3/9-2000.
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Fish killing species. Conference in EC MAST III project ¨NUTOX¨ , 19-22 September.
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Inhibition of toxin production in natural communities. Conference in EC MAST III ¨NUTOX¨ , 19-22 September.
  • Vitenskapelig foredrag
    Wägele, H; Johnsen, Geir. (2000) New result on histology and photosynthetic performance of solar-powered¨ opisthobranchs (Mollusca, Gastropoda, Opisthobranchia) constaining symbiotic chloroplasts or zooxanthellae. - , -
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Bio-optical instruments for use in marine water and plankton. SINTEF seminarseries in bio-optics held at auditorium E5-101 Realfagsbygget NTNU, Gløshaugen. , 14.9.2000
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Why bio-optics in marine biology. 2nd NTNU seminarseries in bio-optic held at the auditorium Trondhjem Biological Station. , 19.10.2000
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Bio-optics as a tool to detect physiological status in toxic algae. Conference in EC MAST III prosject. , 19-22 September
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) Inhibition of toxin production in cultures. Conference in EC MART III prosject. , 19-22 September.
  • Vitenskapelig foredrag
    Johnsen, Geir. (2000) PSP producer Alexandrium tamarense II. Conferrnce in EC MAST III project. , 19-22 September.
  • Vitenskapelig foredrag
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri, Haptophytae. Proceedings of the 9th International conference on Harmful Algal Blooms. , 7-11 Februar
  • Vitenskapelig foredrag
    Legrand, C; Johnsen, Geir; Graneli, E; Sakshaug, Egil. (2000) Effect of polyamines on growth and toxicity of Chrysochromulina leadbeateri and Prymnesium patellifreum (Haptophytes). HAB 2000 , 5-11 Februar
  • Vitenskapelig foredrag
    Chauton, Matilde Skogen; Johnsen, Geir; Legrand, C; Sakshaug, Egil; Granëli, E. (2000) Development of a pontential harmful algal bloom in a mesocosm experiment monitored through pigment analysis and bio-optical measurements. HAB 2000 , 5-11 Februar
  • Vitenskapelig foredrag
    Granëli, E; Legrand, C; Carlsson, P; Maestrini, SY; Johnsen, Geir; Hummert, C. (2000) Nitrogen and phosphorus deficiency favours the dominance and toxin content of harmful species in summer Baltic Sea phytoplankton. HAB 2000 , 5-11 Februar
  • Vitenskapelig foredrag
    Johnsen, Geir; Legrand, C; Chauton, Matilde Skogen; Eigeland, E; Sakshaug, Egil. (2000) The use of a DIVING-PAM for detection of irradiance, biomass and photosystem II fluorescene yield in harmful algal bloom experiments: Discussion of methodological aspects. HAB 2000 , 5-11 Februar

1999

  • Vitenskapelig foredrag
    Legrand, C; Johnsen, Geir; Hummert, C; Graneli, E. (1999) Variation in toxin production in two strains of Alexandrium tamarense: Effects of nitrogen and phosphorus replete vs. limited growth conditions. ASLO winter meeting. , Santa Fe, U.S.A.
  • Vitenskapelig foredrag
    Graneli, E; Carlsson, P; Legrand, C; Johnsen, Geir; Luckas, B; Maestrini, S. Y. (1999) Structuration of marine phytoplankton communities subjected to different levels of N, P and Si limitation in a mesocosm experiment. ASLO winter meeting. , Santa Fe, U.S.A.

1998

  • Vitenskapelig foredrag
    Johnsen, Geir; Sakshaug, Egil. (1998) Monitoring of Harmful Algal Blooms using bio-optical methods. International Symposium and workshop on harmful algal blooms in the Benguela current region and other upwelling ecosystems. Phagotrophy and toxicity in photosynthetic Prymnesium patellifreum (Haptophyte). , 5-6 November.
  • Vitenskapelig foredrag
    Chauton, Matilde Skogen; Johnsen, Geir; Sakshaug, Egil. (1998) In vivo fluorescence exitation spectra of phytoplankton. CANIGO 2nd general meeting. , Portugal.

1997

  • Vitenskapelig foredrag
    Johnsen, Geir; Sakshaug, Egil. (1997) Chlorophyll c3-containing prymnesiophytes and dinoglagellates: a potentially harmful phytoplankton group. VIII International Conference on Harmful Algae, , Spain

1996

  • Vitenskapelig foredrag
    Egeland, E. S; Johnsen, Geir; Liaaen-Jensen, S. (1996) Variable carotenoid composition in a prasinophycean phytoplankton acclimated to three different irradiances. 11th International Symposium on carotenoids, , Netherlands.

1994

  • Vitenskapelig foredrag
    Johnsen, Geir; Sakshaug, Egil. (1994) Pigment composition and photoadaptive pigment variation in three toxic marine dinoflagellate species. Ocean Science Meeting (ASGU/ASLO). , San Diego, California.

1993

  • Vitenskapelig foredrag
    Johnsen, Geir; Nelson, N. B; Jovine, R. V. M; Prezelin, B. B. (1993) Chromoprotein- and pigment dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea. Optical properties and quantum yields of aquatic photosynthetic systems. Binational Scientific Fundation Workshop. , [Mangler data]

1992

  • Vitenskapelig foredrag
    Johnsen, Geir; Samset, O; Volent, Z. (1992) Optical characteristics of phytoplankton in relation to remote sensing. In: Autonomous boi-optical ocean observing systems scientific symposium (AB. , California
  • Vitenskapelig foredrag
    Volent, Z; Johnsen, Geir. (1992) Presentation of an optical algae sensor "Optisens" designed for Eulerian measurements from a moored buoy. In: Autonomous bio-optical ocean observin systems scientific symposium (ABOOS). , California

1990

  • Vitenskapelig foredrag
    Gilstad, M; Johnsen, Geir; Sakshaug, Egil. (1990) Diurnal varations in cell chemistry, photosynthetic parameters and respiration in the marine diatom skeletonema costatum. In: NATO/ASI Individual cell & particle analysis in oceanography. Aquafredda di Maratea. , Italy.
  • Vitenskapelig foredrag
    Johnsen, Geir; Gilstad, M; Sakshaug, Egil. (1990) Diurnal variations in light absorption spectra, fluorescence excitation spectra and pigment composition in the marine diatom skeletonema costatum. NATO/ASI Individual cell & particle analysis in oceanography. Aquafredda di Maratea, , Italy.

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