Blar i Brage IMR på forfatter "Pedersen, Geir"

Viser treff 21-37 av 37

    • Lateral-aspect target strength measurements of in situ herring (Clupea harengus) 

      Pedersen, Geir; Handegard, Nils Olav; Ona, Egil (Journal article; Peer reviewed, 2009-07)
      Surveys of schooling herring with the new multi-beam sonar (Simrad MS70) pose new challenges when converting the echo energy to estimates of biomass. Since the sonar projects horizontally, data and models of lateral-aspect ...

    • Long-Term Statistics of Observed Bubble Depth Versus Modeled Wave Dissipation 

      Strand, Kjersti Opstad; Breivik, Øyvind; Pedersen, Geir; Vikebø, Frode Bendiksen; Sundby, Svein; Christensen, Kai Håkon (Peer reviewed; Journal article, 2020)
      Air bubble penetration depths are investigated with a bottom‐mounted echosounder at a seabed observatory in northern Norway. We compare a 1‐year time series of observed bubble depth against modeled and estimated turbulent ...

    • Measurements of underwater noise radiated by commercial ships at a cabled ocean observatory 

      Zhang, Guosong; Forland, Tonje Nesse; Johnsen, Espen; Pedersen, Geir; Dong, Hefeng (Journal article; Peer reviewed, 2020)
      Measurements of underwater noise radiated under ship normal operations are presented. The acoustic data, from the cabled ocean observatory, are analyzed under each identified ship passage, which was obtained by the Automatic ...

    • Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements 

      Khodabandeloo, Babak; Ona, Egil; Pedersen, Geir; Korneliussen, Rolf; Melle, Webjørn Raunsgård; Klevjer, Thor Aleksander (Peer reviewed; Journal article, 2022)
      Backscattered acoustic energy from a target varies with frequency and carries information about its material properties, size, shape, and orientation. Gas-bearing organisms are strong reflectors of acoustic energy at the ...

    • Mesopelagic flesh shear viscosity estimation from in situ broadband backscattering measurements by a viscous–elastic model inversion 

      Khodabandeloo, Babak; Agersted, Mette Dalgaard; Klevjer, Thor A.; Pedersen, Geir; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2021)
      In fisheries acoustics, target strength (TS) is a key parameter in converting acoustic measurements to biological information such as biomass. Modelling is a versatile tool to estimate TS of marine organisms. For swimbladdered ...

    • Methodology for assessment of the capelin spawning migration in the Barents Sea, spring 2008 

      Eriksen, Elena; Johansen, Geir Odd; Pedersen, Geir; Peña, Hector; Svellingen, Ingvald; Tjelmeland, Sigurd ([Toktrapport/Havforskningsinstituttet];Nr. 8 - 2008, Working paper, 2008)

    • Mid-summer vertical behavior of a high-latitude oceanic zooplankton community 

      Bandara, Kanchana; Basedow, Sünnje Linnéa; Pedersen, Geir; Tverberg, Vigdis (Peer reviewed; Journal article, 2022)
      Vertical behavior, such as diel vertical migration (DVM) and swarming are widespread among zooplankton. At higher latitudes, synchronized DVM is mostly absent during summer and predominantly herbivorous copepods tend to ...

    • A model for the fate of carbon dioxide from a simulated carbon storage seep 

      Loranger, Scott; Pedersen, Geir; Blomberg, Ann E.A. (Peer reviewed; Journal article, 2021)
      Offshore geological carbon storage (GCS) is a rapidly developing technology essential for meeting international climate goals. While the likelihood of leakage from a properly planned geological sequestration site is low, ...

    • Model-informed classification of broadband acoustic backscatter from zooplankton in an in situ mesocosm 

      Dunn, Muriel Barbara; McGowan-Yallop, Chelsey; Pedersen, Geir; Falk-Petersen, Stig; Daase, Malin Hildegard Elisabeth; Last, Kim; Langbehn, Tom; Fielding, Sophie; Brierley, Andrew S.; Cottier, Finlo Robert; Basedow, Sünnje Linnéa; Camus, Lionel; Geoffroy, Maxime (Peer reviewed; Journal article, 2023)
      Classification of zooplankton to species with broadband echosounder data could increase the taxonomic resolution of acoustic surveys and reduce the dependence on net and trawl samples for ‘ground truthing’. Supervised ...

    • The One Ocean Expedition: Science and Sailing for the Ocean We Want 

      Huse, Geir; Baussant, Thierry; Becker, Meike; Biuw, Martin; Bødtker, Gunhild; Cook, Jeremy; Gomiero, Alessio; Grøsvik, Bjørn Einar; Handegard, Nils Olav; Hestnes, Arne Johan; Hole, Lars Robert; Husson, Berengere; Jaccard, Pierre Franqois; Johannessen, Johnny Andre; Krolicka, Adriana; Lien, Vidar Surén; Lindemann, Christian; Olsen, Are; Renner, Angelika; Lid, Sjur Ringheim; Steen-Larsen, Hans Christian; Strand, Espen; Westgaard, Jon-Ivar; Pedersen, Geir (Rapport fra havforskningen;2023 - 34, Research report, 2023)
      The One Ocean Expedition (OOE) was a 20-month long circumnavigation of the globe by the Norwegian sail training vessel Statsraad Lehmkuhl, and a recognised part of the UN decade of Ocean Science for Sustainable Development. ...

    • Quantitative processing of broadband data as implemented in a scientific split-beam echosounder 

      Andersen, Lars Nonboe; Chu, Dezhang; Handegard, Nils Olav; Heimvoll, Harald; Korneliussen, Rolf; Macaulay, Gavin; Ona, Egil; Patel, Ruben; Pedersen, Geir (Peer reviewed; Journal article, 2023)
      The use of quantitative broadband echosounders for biological studies and surveys can offer considerable advantages over narrowband echosounders. These include improved spectral-based target identification and significantly ...

    • The relative frequency response, as derived from individually separated targets on cod, saithe and Norway pout 

      Pedersen, Geir; Korneliussen, Rolf J.; Ona, Egil (ICES CM documents, Working paper, 2004)
      The relative frequency response is an important acoustic feature used to characterise acoustic targets. This response has been defined as the sv, volume backscattering coefficient, for a specific frequency relative to ...

    • Silent research vessels are not quiet 

      Ona, Egil; Godø, Olav Rune; Handegard, Nils Olav; Hjellvik, Vidar; Patel, Ruben; Pedersen, Geir (Journal article; Peer reviewed, 2007)
      Behavior of herring Clupea harengus stimulated by two ocean-going research vessels; respectively designed with and without regard to radiated-noise-standards. Both vessels generate a reaction pattern, but, contrary to ...

    • Survey report for CRIMAC SFI 2023 

      Handegard, Nils Olav; Allken, Vaneeda; Holmin, Arne Johannes; Johnsen, Espen; Korneliussen, Rolf; Pedersen, Geir; Skjefstad, Joakim; Rogge, Rabea Patricia; Samuelsen, Mikal Arntzen; Tenningen, Maria; Sivle, Lise Doksæter (Toktrapport;2024 - 7, Research report, 2024)
      This cruise report describes the objectives, methods, and preliminary results from the tasks carried out at the CRIMAC SFI survey. The survey was conducted on board RV G.O. Sars between November 15th (Tromsø) and November ...

    • Temporal patterns in the soundscape of a Norwegian gateway to the Arctic 

      Aniceto, Ana Sofia; Ferguson, Elizabeth L.; Pedersen, Geir; Tarroux, Arnaud; Primicerio, Raul (Peer reviewed; Journal article, 2022)
      As an Arctic gateway, the Norwegian Sea sustains a rich diversity of seasonal and resident species of soniferous animals, vulnerable to the effects of climate change and anthropogenic activities. We show the occurrence of ...

    • Testing acoustic platforms and methodology for observing marine ecosystem processes [1/10 - 20/10, 2006] 

      Johansen, Geir Odd; Godø, Olav Rune; Pedersen, Geir; Staurland Aarbakke, Ole Nicolai; Torkelsen, Terje; Totland, Atle ([Toktrapport/Havforskningsinstituttet];Nr. 10 - 2006, Working paper, 2006)

    • Underwater noise from wind at the high north LoVe ocean observatory 

      Ødegaard, Lars Alf; Pedersen, Geir; Johnsen, Espen (Peer reviewed; Journal article, 2019)