Blar i Brage IMR på forfatter "Hjøllo, Solfrid Sætre"
-
North Sea sensitivity to atmospheric forcing
Skogen, Morten D.; Drinkwater, Ken; Hjøllo, Solfrid Sætre; Schrum, Corinna (Journal article; Peer reviewed, 2011-04)The sensitivity of North Sea physics and phytoplankton production to atmospheric forcing has been studied by performing perturbations of the atmospheric forcing fields through a number of model simulations. The perturbations ... -
Offshore wind energy – effect on maritime resources and environment
Hjøllo, Solfrid Sætre (Conference object, 2010) -
Overwintering distribution, inflow patterns and sustainability of Calanus finmarchicus in the North Sea
Gao, Shuang; Hjøllo, Solfrid Sætre; Falkenhaug, Tone; Strand, Espen; Edwards, Martin; Skogen, Morten D. (Peer reviewed; Journal article, 2021)Calanoid copepods are key taxa in the North Sea as they are the main food source for many fish stocks, such as herring, mackerel and cod. In this study we use an individual-based model for Calanus finmarchicus embedded in ... -
Panel-based Assessment of Ecosystem Condition of the Norwegian Sea Pelagic Ecosystem
Arneberg, Per; Siwertsson, Anna; Husson, Berengere; Børsheim, Knut Yngve; Fauchald, Per; Hjøllo, Solfrid Sætre; Høines, Åge Sigurd; Jones, Elizabeth Marie; Melle, Webjørn Raunsgård; Nøttestad, Leif; Planque, Benjamin; Skagseth, Øystein; Slotte, Aril; Solvang, Hiroko Kato; Stenevik, Erling Kåre (Rapport fra havforskningen;2023 -16, Research report, 2023)The System for Assessment of Ecological Condition, coordinated by the Norwegian Environment Agency, is intended to form the foundation for evidence-based assessments of the ecological condition of Norwegian terrestrial and ... -
Particle aggregation at the edges of anticyclonic eddies and implications for distribution of biomass
Samuelsen, Annette; Hjøllo, Solfrid Sætre; Johannessen, Johnny Andre; Patel, Ruben (Journal article; Peer reviewed, 2012)Acoustic measurements show that the biomass of zooplankton and mesopelagic fish is redistributed by mesoscale variability and that the signal extends over several hundred meters depth. The mechanisms governing this ... -
Patterns, efficiency and ecosystem effects when fishing Calanus finmarchicus in the Norwegian Sea—using an individual-based model
Hansen, Cecilie; Skogen, Morten D.; Utne, Kjell Rong; Broms, Cecilie; Strand, Espen; Hjøllo, Solfrid Sætre (Peer reviewed; Journal article, 2021)Due to the important role of Calanus finmarchicus as key prey for the abundant pelagic fish stocks (Northeast Atlantic mackerel, Norwegian spring spawning herring, blue whiting) in the Norwegian Sea, an increase in the ... -
PELFOSS (PELagic Fish Observation System Simulator)
Skogen, Morten D.; Handegard, Nils Olav; Holmin, Arne Johannes; Hjøllo, Solfrid Sætre; Mousing, Erik Askov; Utne, Kjell Rong; Vabø, Rune (Rapport fra havforskningen;30-2018, Research report, 2018)PELFOSS har utviklet en observasjonssystem-simulator for pelagisk fisk i Norskehavet. Simulatoren er en dataløype der romlig fordeling av fiskebestander fra en økosystemmodell er benyttet til å simulere ulike tokt. Disse ... -
Productivity in the Barents Sea - Response to Recent Climate Variability
Dalpadado, Padmini; Arrigo, Kevin R.; Hjøllo, Solfrid Sætre; Rey, Francisco; Ingvaldsen, Randi B.; Sperfeld, Erik; Dijken, Gert L. van; Stige, Leif C.; Olsen, Are; Ottersen, Geir (Journal article; Peer reviewed, 2014-05-01)The temporal and spatial dynamics of primary and secondary biomass/production in the Barents Sea since the late 1990s are examined using remote sensing data, observations and a coupled physical-biological model. Field ... -
Recruitment regime shifts and nonstationarity are widespread phenomena in harvestable stocks experiencing pronounced climate fluctuations
Ma, Shuyang; Huse, Geir; Ono, Kotaro; Nash, Richard David Marriott; Sandø, Anne Britt; Nedreaas, Kjell Harald; Hjøllo, Solfrid Sætre; Sundby, Svein; Clegg, Thomas L; Vølstad, Jon Helge; Kjesbu, Olav Sigurd (Peer reviewed; Journal article, 2023)Methods to reliably identify jump discontinuities in biological time series and to assess the specific contribution of various covariates are rapidly progressing. Here, we took advantage of these statistical improvements ... -
Risikoanalyse for de norske havområdene om direkte og indirekte virkninger av klimaendringer på marine økosystemer under ulike utslippsscenarier - Risikorapport om hav og klima
Sandø, Anne Britt; Hjøllo, Solfrid Sætre; Hansen, Cecilie; Skogen, Morten D.; Hordoir, Robinson; Sundby, Svein (Rapport fra havforskningen;2022 - 41, Research report, 2022)Bakgrunn for denne rapporten var at regjeringen ønsket å gjennomføre en risikoanalyse for norske havområder av direkte og indirekte virkninger av klimaendringer på marine økosystemer under ulike utslippsscenarier. ... -
Seasonal phytoplankton blooms in the North Atlantic linked to the overwintering strategies of copepods
Friedland, Kevin D; Record, Nicholas R; Asch, Rebecca G; Kristiansen, Trond; Saba, Vincent S; Drinkwater, Kennneth F.; Henson, Stephanie; Leaf, Robert T; Morse, Ryan E; Johns, David G; Large, Scott I; Hjøllo, Solfrid Sætre; Nye, Janet A; Alexander, Mike A; Ji, Rubao (Journal article; Peer reviewed, 2016)The North Atlantic Ocean contains diverse patterns of seasonal phytoplankton blooms with distinct internal dynamics. We analyzed blooms using remotely-sensed chlorophyll a concentration data and change point statistics. ... -
The importance of calibrating climate change projections to local conditions at aquaculture sites
Falconer, Lynne; Hjøllo, Solfrid Sætre; Telfer, Trevor C.; McAdam, Bruce J.; Hermansen, Øystein; Ytteborg, Elisabeth (Peer reviewed; Journal article, 2020)Future climate projections are usually only available at global or coarse scale and the focus is often on long-term global or regional averages. Though useful to analyse general trends and identify potential risks and ... -
Transportation and predation control structures the distribution of a key calanoid in the Nordic Seas
Aarflot, Johanna Myrseth; Hjøllo, Solfrid Sætre; Strand, Espen; Skogen, Morten D. (Peer reviewed; Journal article, 2022)The largest Calanus species in the Nordic Seas is also the copepod for which we have the poorest knowledge. Recent studies have shown that C. hyperboreus is more likely of sub-Arctic rather than Arctic origins, and the ... -
Virvler i havet skaper oaser av liv
Samuelsen, Annette; Hjøllo, Solfrid Sætre (Chronicle, 2012-03-31) -
Why do regional biogeochemical models produce contrasting future projections of primary production in the Barents Sea?
Mousing, Erik Askov; Ellingsen, Ingrid Helene; Hjøllo, Solfrid Sætre; Husson, Berengere; Skogen, Morten D.; Wallhead, Philip (Peer reviewed; Journal article, 2023)Projected future changes in primary production in the Barents Sea vary among different regional biogeochemical models, with some showing an increase, some a decrease, and some no change. This variability has been attributed ...