• Assessing impacts of simulated oil spills on the Northeast Arctic cod fishery 

      Carroll, JoLynn; Vikebø, Frode Bendiksen; Howell, Daniel; Broch, Ole Jacob; Nepstad, Raymond; Augustine, Starrlight; Skeie, Geir Morten; Bast, Radovan; Juselius, Jonas (Journal article; Peer reviewed, 2018-01)
      We simulate oil spills of 1500 and 4500 m3/day lasting 14, 45, and 90 days in the spawning grounds of the commercial fish species, Northeast Arctic cod. Modeling the life history of individual fish eggs and larvae, we ...
    • Assessing impacts of simulated oil spills on the Northeast Arctic cod fishery 

      Carroll, JoLynn; Vikebø, Frode Bendiksen; Howell, Daniel; Broch, OJ; Nepstad, Raymond; Augustine, Starrlight; Skeie, Geir Morten; Bast, Radovan; Juselius, Jonas (Journal article; Peer reviewed, 2017)
      We simulate oil spills of 1500 and 4500 m3/day lasting 14, 45, and 90 days in the spawning grounds of the commercial fish species, Northeast Arctic cod. Modeling the life history of individual fish eggs and larvae, we ...
    • Automatic determination of heart rates from microscopy videos of early life stages of fish 

      Nepstad, Raymond; Davies, Emlyn John; Altin, Dag; Nordtug, Trond; Hansen, Bjørn Henrik (Journal article; Peer reviewed, 2017-08-29)
      Toxic effects of organic hydrophobic contaminants include impacts on fish heart rate (HR) and cardiac functioning. Thus, in ecotoxicology as well as aquaculture and even medicine, fish heart functioning plays an important ...
    • Dynamic Links between Lipid Storage, Toxicokinetics and Mortality in a Marine Copepod Exposed to Dimethylnaphthalene 

      Jager, Tjalling; Øverjordet, Ida Beathe; Nepstad, Raymond; Hansen, Bjørn Henrik (Journal article; Peer reviewed, 2017-06-17)
      Efficiently assessing and managing the risks of pollution in the marine environment requires mechanistic models for toxic effects. The General Unified Threshold model for Survival (GUTS) provides a framework for deriving ...
    • Embryonic exposure to produced water can cause cardiac toxicity and deformations in Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) larvae 

      Hansen, Bjørn Henrik; Sørensen, Lisbet; Størseth, Trond Røvik; Nepstad, Raymond; Altin, Dag; Krause, Daniel Franklin; Meier, Sonnich; Nordtug, Trond (Journal article; Peer reviewed, 2019-06)
      Regular discharges of produced water from the oil and gas industry represents the largest direct discharge of effluent into the marine environment worldwide. Organic compound classes typically reported in produced water ...
    • In situ characterisation of complex suspended particulates surrounding an active submarine tailings placement site in a Norwegian fjord 

      Davies, Emlyn John; Nepstad, Raymond (Journal article; Peer reviewed, 2017-11)
      Suspended particle measurements over flood and ebb transects of a Norwegian fjord (Frænfjorden) with an active submarine mine tailings placement are presented. Measurements focused on characterisation of spatial variability ...
    • New insights into submarine tailing disposal for a reduced environmental footprint: Lessons learnt from Norwegian fjords 

      Ramirez-Llodra, Eva; Trannum, Hilde Cecilie; Andersen, Guri Sogn; Baeten, Nicole; Brooks, Steven; Escudero-Oñate, Carlos; Gundersen, Hege; Kleiv, Rolf Arne; Ibragimova, Olga; Lepland, Aivo; Nepstad, Raymond; Sandøy, Roar; Schaanning, Morten; Shimmield, Tracy; Yakushev, Evgeniy; Ferrando-Climent, Laura; Høgaas, Per Helge (Peer reviewed; Journal article, 2022)
      Submarine tailing disposal (STD) in fjords from land-based mines is common practice in Norway and takes place in other regions worldwide. We synthesize the results of a multidisciplinary programme on environmental impacts ...
    • North sea produced water PAH exposure and uptake in early life stages of Atlantic Cod 

      Nepstad, Raymond; Hansen, Bjørn Henrik; Skancke, Jørgen (Journal article; Peer reviewed, 2020)
      Produced water discharges from offshore oil and gas platforms represent a significant source of petroleum components such as polycyclic aromatic hydrocarbons (PAHs) released to the ocean. High molecular weight PAHs are ...
    • Numerical analysis of boundary conditions in a Lagrangian particle model for vertical mixing, transport and surfacing of buoyant particles in the water column 

      Nordam, Tor; Kristiansen, Ruben; Nepstad, Raymond; Röhrs, Johannes (Journal article; Peer reviewed, 2019-04)
      Lagrangian particle models are used for many applications in the ocean sciences, including transport modelling of oil spills, fish eggs and larvae, plastics, and sediment particles. In the context of oil spill modelling, ...
    • Numerical Integration and Interpolation in Marine Pollutant Transport Modelling 

      Nordam, Tor; Brönner, Ute; Skancke, Jørgen; Nepstad, Raymond; Rønningen, Petter; Alver, Morten (Chapter, 2018)
      Transport modelling of oil and other chemicals in the ocean relies on information on curret velocity as a function of position and time, v(x, t). These data will in many cases be supplied from an ocean circulation model, ...
    • On the use of random walk schemes in oil spill modelling 

      Nordam, Tor; Nepstad, Raymond; Litzler, Emma; Röhrs, Johannes (Journal article; Peer reviewed, 2019-09)
      In oil spill models, vertical mixing due to turbulence is commonly modelled by random walk. If the eddy diffusivity varies with depth, failing to take the derivative of the diffusivity into account in the random walk scheme ...
    • Resiliency of a healthy fish stock to recruitment losses from oil spills 

      Carroll, JoLynn; Vikebø, Frode Bendiksen; Howell, Daniel; Broch, Ole Jacob; Nepstad, Raymond; Augustine, Starrlight; Skeie, Geir Morten; Bast, Radovan (Journal article; Peer reviewed, 2018-01)
      We simulate oil spills of 1500 and 4500 m3/day lasting 14, 45, and 90 days in the spawning grounds of the commercial fish species, Northeast Arctic cod. Modeling the life history of individual fish eggs and larvae, we ...
    • Simple energy-budget model for yolk-feeding stages of Atlantic cod (Gadus morhua) 

      Jager, Tjalling; Nepstad, Raymond; Hansen, Bjørn Henrik; Farkas, Julia (Journal article; Peer reviewed, 2018-10-10)
      Atlantic cod (Gadus morhua) is a commercially important species, and therefore, understanding the influence of environmental factors and anthropogenic stressors on its early life stages is of considerable relevance. In ...
    • Simulating crude oil exposure, uptake and effects in North Atlantic Calanus finmarchicus populations 

      Broch, Ole Jacob; Nepstad, Raymond; Ellingsen, Ingrid H.; Bast, Radovan; Skeie, Morten; Carroll, JoLynn (Journal article; Peer reviewed, 2020-12)
      A simulation model framework (SYMBIOSES) that includes a 3-dimensional ocean physics and biology model and a model for transport and fate of oil was used to investigate the potential for bioaccumulation and lethal/sublethal ...
    • Spatiotemporal Dispersal and Deposition of Fish Farm Wastes: A Model Study from Central Norway 

      Broch, Ole Jacob; Daae, Ragnhild Lundmark; Ellingsen, Ingrid H.; Nepstad, Raymond; Bendiksen, Eldar Åsgard; Reed, Jenny Lisa; Senneset, Gunnar (Journal article; Peer reviewed, 2017-06-28)
      A spatially explicit coupled hydrodynamic-mass transport model system was used to simulate dispersal of particulate organic matter from Atlantic salmon (Salmo salar) farming in central Norway. Model setups of 32 m horizontal ...
    • SubSea Dispersant lnjection (SSDI)- a "state of the art" and the need for further documentations 

      Daling, Per Snorre; Brakstad, Odd Gunnar; Brandvik, Per Johan; Davies, Emlyn J.; Grøsvik, Bjørn Einar; Meier, Sonnich; Nepstad, Raymond; Nordtug, Trond; Vikebø, Frode Bendiksen (SINTEF Ocean reports;2017:00007 A, Research report, 2016-01-08)
      The aim of this pre-project has been to give a "State-of the art" and describe the R&D challenges and documentation needed in order to perform robust NEBA (Net Environmental Benefit Analysis) where SubSea Dispersant Injection ...
    • The use of wide-band transmittance imaging to size and classify suspended particulate matter in seawater 

      Davies, Emlyn John; Brandvik, Per Johan; Leirvik, Frode; Nepstad, Raymond (Journal article; Peer reviewed, 2017-02-02)
      An in situ particle imaging system for measurement of high concentrations of suspended particles ranging from 30 μm to several mm in diameter, is presented. The system obtains quasi-silhouettes of particles suspended within ...
    • Toxicokinetics of Crude Oil Components in Arctic Copepods 

      Øverjordet, Ida Beathe; Nepstad, Raymond; Hansen, Bjørn Henrik; Jager, Tjalling; Farkas, Julia; Altin, Dag; Brönner, Ute; Nordtug, Trond (Journal article; Peer reviewed, 2018-06-13)
      The risk of accidental oil spills in the Arctic is on the rise due to increased shipping and oil exploration activities, making it essential to calibrate parameters for risk assessment of oil spills to Arctic conditions. ...