Blar i Geophysical Institute på forfatter "Eldevik, Tor"
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Arctic/Atlantic exchanges via the Subpolar Gyre
Langehaug, Helene Reinertsen; Medhaug, Iselin; Eldevik, Tor; Otterå, Odd Helge (Peer reviewed; Journal article, 2012)In the present study we investigate the decadal variability in the strength and shape of the Subpolar Gyre (SPG) in a 600-year pre-industrial simulation using the Bergen Climate Model. The atmospheric influence on the SPG ... -
Barents Sea ice cover reflects Atlantic inflow
Årthun, Marius; Eldevik, Tor; Smedsrud, Lars Henrik; Skagseth, Øystein (Working paper, 2011)The recent Arctic winter sea-ice retreat is most pronounced in the Barents Sea. Using available observations of the Atlantic inflow to the Barents Sea and results from a regional ice-ocean model we assess the role of ... -
A brief history of climate – the northern seas from the Last Glacial Maximum to global warming
Eldevik, Tor; Risebrobakken, Bjørg; Bjune, Anne Elisabeth; Andersson, Carin; Birks, Harry John Betteley; Dokken, Trond Martin; Drange, Helge; Glessmer, Mirjam Sophia; Li, Camille; Nilsen, Jan Even Øie; Otterå, Odd Helge; Richter, Kristin; Skagseth, Øystein (Peer reviewed; Journal article, 2014-12)The understanding of climate and climate change is fundamentally concerned with two things: a well-defined and sufficiently complete climate record to be explained, for example of observed temperature, and a relevant ... -
Convective chimneys and plumes in the Northern Greenland Sea
Johannessen, Ola M.; Lygre, Kjetil; Eldevik, Tor (Geophysical Monograph Series;30, Chapter, 2005)In the Boreas Basin in the northern Greenland Sea, convection has been observed to be localized as narrow structures - chimneys - in which the water masses may be homogeneous from the surface through great depths. An ... -
Expanding Influence of Atlantic and Pacific Ocean Heat Transport on Winter Sea-Ice Variability in a Warming Arctic
Dörr, Jakob Simon; Årthun, Marius; Eldevik, Tor; Sandø, Anne Britt (Journal article; Peer reviewed, 2024)The gradual anthropogenic-driven retreat of Arctic sea ice is overlaid by large natural (internal) year-to-year variability. In winter, sea-ice loss and variability are currently most pronounced in the Barents Sea. As the ... -
How northern freshwater input can stabilise thermohaline circulation
Lambert, Erwin; Eldevik, Tor; Haugan, Peter M. (Peer reviewed; Journal article, 2016)The North Atlantic thermohaline circulation (THC) carries heat and salt towards the Arctic. This circulation is partly sustained by buoyancy loss and is generally believed to be inhibited by northern freshwater input as ... -
Impact of initialization methods on the predictive skill in NorCPM: an Arctic–Atlantic case study
Passos, Leilane G.; Langehaug, Helene R.; Årthun, Marius; Eldevik, Tor; Bethke, Ingo; Kimmritz, Madlen (Journal article; Peer reviewed, 2022)The skilful prediction of climatic conditions on a forecast horizon of months to decades into the future remains a main scientific challenge of large societal benefit. Here we assess the hindcast skill of the Norwegian ... -
Intermediate water from the Greenland Sea in the Faroe Bank Channel : spreading of released sulphur hexafluoride
Olsson, K. Anders; Jeansson, Emil; Anderson, Leif G.; Hansen, Bogi; Eldevik, Tor; Kristiansen, Regin; Messias, Marie-José; Johannessen, Truls; Watson, Andrew J. (Journal article, 2005-02)The Faroe Bank Channel is the deepest passage for dense water leaving the Nordic Seas into the North Atlantic. The contribution to this part of the Greenland-Scotland Overflow by intermediate water from the Greenland Sea ... -
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation
Medhaug, Iselin; Langehaug, Helene Reinertsen; Eldevik, Tor; Furevik, Tore; Bentsen, Mats (Peer reviewed; Journal article, 2011-06-25)Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 ... -
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea
Asbjørnsen, Helene; Årthun, Marius; Skagseth, Øystein; Eldevik, Tor (Peer reviewed; Journal article, 2019-04)Ocean heat content in the Norwegian Sea exhibits pronounced variability on interannual to decadal time scales. These ocean heat anomalies are known to influence Arctic sea ice extent, marine ecosystems, and continental ... -
Mechanisms of regional winter sea-ice variability in a warming arctic
Dörr, Jakob Simon; Årthun, Marius; Eldevik, Tor; Madonna, Erica (Journal article; Peer reviewed, 2021)The Arctic winter sea ice cover is in retreat overlaid by large internal variability. Changes to sea ice are driven by exchange of heat, momentum, and freshwater within and between the ocean and the atmosphere. Using a ... -
Mechanisms underlying recent Arctic atlantification
Asbjørnsen, Helene; Årthun, Marius; Skagseth, Øystein; Eldevik, Tor (Journal article; Peer reviewed, 2020-06-20)Recent warming and reduced sea ice concentrations in the Atlantic sector of the Arctic Ocean are the main signatures of ongoing Arctic “Atlantification.” The mechanisms driving the warming trends are nevertheless still ... -
NorCPM1 and its contribution to CMIP6 DCPP
Bethke, Ingo; Wang, Yiguo; Counillon, Francois Stephane; Keenlyside, Noel Sebastian; Kimmritz, Madlen; Fransner, Filippa; Samuelsen, Annette; Langehaug, Helene R.; Svendsen, Lea; Chiu, Ping-Gin; Passos, Leilane G.; Bentsen, Mats; Guo, Chuncheng; Gupta, Alok Kumar; Tjiputra, Jerry; Kirkevåg, Alf; Oliviè, Dirk Jan Leo; Seland, Øyvind; Vågane, Julie Solsvik; Fan, Yuanchao; Eldevik, Tor (Journal article; Peer reviewed, 2021)The Norwegian Climate Prediction Model version 1 (NorCPM1) is a new research tool for performing climate reanalyses and seasonal-to-decadal climate predictions. It combines the Norwegian Earth System Model version 1 (NorESM1) ... -
Nordic Seas Heat Loss, Atlantic Inflow, and Arctic Sea Ice cover over the last century
Smedsrud, Lars Henrik; Muilwijk, Morven; Eldevik, Tor; Årthun, Marius; Brakstad, Ailin; Madonna, Erica; Lauvset, Siv Kari; Spensberger, Clemens; Born, Andreas; Drange, Helge; Jeansson, Emil; Li, Camille; Olsen, Are; Skagseth, Øystein; Slater, Donald; Straneo, Fiammetta; Våge, Kjetil (Journal article; Peer reviewed, 2021)Poleward ocean heat transport is a key process in the earth system. We detail and review the northward Atlantic Water (AW) flow, Arctic Ocean heat transport, and heat loss to the atmosphere since 1900 in relation to sea ... -
Observed change and the extent of coherence in the Gulf Stream system
Asbjørnsen, Helene; Eldevik, Tor; Skrefsrud, Johanne; Johnson, Helen L.; Sanchez-Franks, Alejandra (Journal article; Peer reviewed, 2024)By transporting warm and salty water poleward, the Gulf Stream system maintains a mild climate in northwestern Europe while also facilitating the dense water formation that feeds the deep ocean. The sensitivity of North ... -
On radar imaging of current features: 2. Mesoscale eddy and current front detection
Johannessen, Johnny A.; Kudryavtsev, Vladimir; Akimov, D.; Eldevik, Tor; Winther, Nina Gjerde; Chapron, B. (Peer reviewed; Journal article, 2005-07-22)The surface signatures of meandering fronts and eddies have been regularly observed and documented in synthetic aperture radar (SAR) images. Wave-current interactions, the suppression of short wind waves by natural film, ... -
On the Dynamics and Water Mass Transformation of a Boundary Current Connecting Alpha and Beta Oceans
Lambert, Erwin; Eldevik, Tor; Spall, Michael A. (Peer reviewed; Journal article, 2018-10-19)A subpolar marginal sea, like the Nordic seas, is a transition zone between the temperature-stratified subtropics (the alpha ocean) and the salinity-stratified polar regions (the beta ocean). An inflow of Atlantic Water ... -
Pathways and export of Greenland Sea Water. In: The Nordic Seas: an integrated perspective
Eldevik, Tor; Straneo, Fiammetta; Sandø, Anne Britt; Furevik, Tore (Geophysical Monograph Series;158, Chapter, 2005) -
The Role of Atlantic Heat Transport in Future Arctic Winter Sea Ice Loss
Årthun, Marius; Eldevik, Tor; Smedsrud, Lars H. (Peer reviewed; Journal article, 2019-05-14)During recent decades Arctic sea ice variability and retreat during winter have largely been a result of variable ocean heat transport (OHT). Here we use the Community Earth System Model (CESM) large ensemble simulation ... -
The Seasonal and Regional Transition to an Ice-Free Arctic
Årthun, Marius; Onarheim, Ingrid H.; Dörr, Jakob; Eldevik, Tor (Journal article; Peer reviewed, 2021)The Arctic sea ice cover is currently retreating and will continue its retreat in a warming world. However, the loss of sea ice is neither regionally nor seasonally uniform. Here, we present the first regional and seasonal ...