• Accuracy of the Kirchhoff-approximation and Kirchhoff-ray-mode fish swimbladder acoustic scattering models 

      Macaulay, Gavin; Pena, Hector; Fässler, Sacha M.M.; Pedersen, Geir; Ona, Egil (Journal article; Peer reviewed, 2013)
      The acoustic backscatter from pressure release prolate spheroids and a three-dimensional representation of a fish swimbladder (Chilean jack mackerel, Trachurus symmetricus murphyi) was calculated using four target strength ...
    • Arctic Marine Data Collection Using Oceanic Gliders: Providing Ecological Context to Cetacean Vocalizations 

      Aniceto, Ana Sofia; Pedersen, Geir; Primicerio, Raul; Biuw, Martin; Lindstrøm, Ulf (Peer reviewed; Journal article, 2020)
      To achieve effective management and understanding of risks associated with increasing anthropogenic pressures in the ocean, it is essential to successfully and efficiently collect data with high spatio–temporal resolution ...
    • Autonomous Surface and Underwater Vehicles as Effective Ecosystem Monitoring and Research Platforms in the Arctic—The Glider Project 

      Camus, Lionel; Andrade, Hector; Aniceto, Ana Sofia; Aune, Magnus; Bandara, Kanchana; Basedow, Sünnje Linnéa; Christensen, Kai Håkon; Cook, Jeremy; Daase, Malin; Dunlop, Katherine Mary; Falk-Petersen, Stig; fietzek, Peter; Fonnes, Gro; Ghaffari, Peygham; Gramvik, Geir; Graves, Inger; Hayes, Daniel; Langeland, Tom; Lura, Harald; Marin, Trond Kristiansen; Nøst, Ole Anders; Peddie, David; Pederick, Joel; Pedersen, Geir; Sperrevik, Ann Kristin; Sørensen, Kai; Tassara, Luca; Tjøstheim, Sigurd; Tverberg, Vigdis; Dahle, Salve (Peer reviewed; Journal article, 2021)
      Effective ocean management requires integrated and sustainable ocean observing systems enabling us to map and understand ecosystem properties and the effects of human activities. Autonomous subsurface and surface vehicles, ...
    • Blue whiting survey during spring 2005 

      Heino, Mikko; Søiland, Henrik; Dahl, Martin; Pedersen, Geir; Alvarez, Jaime; Anthonypillai, Valentine; Hovland, Terje; de Lange, Jan; Meland, Elna; Myklevoll, Sigmund; Svendsen, Bjørn V.; Tangen, Øyvind; Torkelsen, Terje ([Toktrapport/Havforskningsinstituttet];Nr. 5 - 2005, Working paper, 2005-04)
    • Calibrating split beam transducers at depth 

      Ona, Egil; Pedersen, Geir (Journal article; Peer reviewed, 2006)
    • CRIMAC - Annual Report 2020 

      Ona, Egil; Handegard, Nils Olav; Pedersen, Geir; Forland, Tonje Nesse; Tenningen, Maria; Johnsen, Espen (Research report, 2021)
    • Estimating tail-beat frequency using split-beam echosounders 

      Handegard, Nils Olav; Pedersen, Geir; Brix, Ole (Journal article; Peer reviewed, 2009-02-04)
      Data from a standard split-beam echosounder are used to estimate tail-beat frequency within a dense herring (Clupea harengus L.) layer. The data were collected by lowering a horizontally projecting 38 kHz split-beam ...
    • Estimating tail-beat frequency using split-beam echosounders 

      Handegard, Nils Olav; Pedersen, Geir; Brix, Ole (Journal article; Peer reviewed, 2009-02-04)
      Data from a standard split-beam echosounder are used to estimate tail-beat frequency within a dense herring (Clupea harengus L.) layer. The data were collected by lowering a horizontally projecting 38 kHz split-beam ...
    • Fisheries acoustics and Acoustic Target Classification - Report from the COGMAR/CRIMAC workshop on machine learning methods in fisheries acoustics 

      Handegard, Nils Olav; Andersen, Lars Nonboe; Brautaset, Olav; Choi, Changkyu; Eliassen, Inge Kristian; Heggelund, Yngve; Hestnes, Arne Johan; Malde, Ketil; Osland, Håkon; Ordonez, Alba; Patel, Ruben; Pedersen, Geir; Umar, Ibrahim; Engeland, Tom Van; Vatnehol, Sindre (Rapport fra havforskningen;2021 - 25, Research report, 2021)
      This report documents a workshop organised by the COGMAR and CRIMAC projects. The objective of the workshop was twofold. The first objective was to give an overview of ongoing work using machine learning for Acoustic Target ...
    • Humpback Whale (Megaptera novaeangliae) Song on a Subarctic Feeding Ground 

      Martin, Saskia C.; Aniceto, Ana Sofia; Ahonen, Heidi; Pedersen, Geir; Lindstrøm, Ulf (Peer reviewed; Journal article, 2021)
      Male humpback whales (Megaptera novaeangliae) are known to produce long complex sequences of structured vocalizations called song. Singing behavior has traditionally been associated with low latitude breeding grounds but ...
    • In situ calibration of observatory broadband echosounders 

      Ona, Egil; Zhang, Guosong; Pedersen, Geir; Johnsen, Espen (Peer reviewed; Journal article, 2020)
      Today, numerous scientific echosounders are used as continuously monitoring systems in ocean observatories. These echosounders are usually calibrated in shallow water, either in laboratory tanks or at random ocean docks ...
    • 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 ...
    • 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 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)
    • 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, ...
    • 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 ...