Mechanisms of Ocean Heat Anomalies in the Norwegian Sea
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 climate. It nevertheless remains unknown to what extent such heat anomalies are p...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hdl.handle.net/1956/20665 https://doi.org/10.1029/2018jc014649 |
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ftunivbergen:oai:bora.uib.no:1956/20665 2023-05-15T15:09:36+02:00 Mechanisms of Ocean Heat Anomalies in the Norwegian Sea Asbjørnsen, Helene Årthun, Marius Skagseth, Øystein Eldevik, Tor 2019-06-12T12:16:37Z application/pdf https://hdl.handle.net/1956/20665 https://doi.org/10.1029/2018jc014649 eng eng Wiley Norges forskningsråd: 263223 Trond Mohn stiftelse: BFS2018TMT01 EC/H2020: 727852 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/20665 https://doi.org/10.1029/2018jc014649 cristin:1702862 Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Authors Journal of Geophysical Research - Oceans Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.1029/2018jc014649 2023-03-14T17:43:32Z 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 climate. It nevertheless remains unknown to what extent such heat anomalies are produced locally within the Norwegian Sea, and to what extent the region is more of a passive receiver of anomalies formed elsewhere. A main practical challenge has been the lack of closed heat budget diagnostics. In order to address this issue, a regional heat budget is calculated for the Norwegian Sea using the ECCOv4 ocean state estimate—a dynamically and kinematically consistent model framework fitted to ocean observations for the period 1992–2015. The depth‐integrated Norwegian Sea heat budget shows that both ocean advection and air‐sea heat fluxes play an active role in the formation of interannual heat content anomalies. A spatial analysis of the individual heat budget terms shows that ocean advection is the primary contributor to heat content variability in the Atlantic domain of the Norwegian Sea. Anomalous heat advection furthermore depends on the strength of the Atlantic water inflow, which is related to large‐scale circulation changes in the subpolar North Atlantic. This result suggests a potential for predicting Norwegian Sea heat content based on upstream conditions. However, local surface forcing (air‐sea heat fluxes and Ekman forcing) within the Norwegian Sea substantially modifies the phase and amplitude of ocean heat anomalies along their poleward pathway, and, hence, acts to limit predictability. publishedVersion Article in Journal/Newspaper Arctic North Atlantic Norwegian Sea Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Norwegian Sea Journal of Geophysical Research: Oceans 124 4 2908 2923 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
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 climate. It nevertheless remains unknown to what extent such heat anomalies are produced locally within the Norwegian Sea, and to what extent the region is more of a passive receiver of anomalies formed elsewhere. A main practical challenge has been the lack of closed heat budget diagnostics. In order to address this issue, a regional heat budget is calculated for the Norwegian Sea using the ECCOv4 ocean state estimate—a dynamically and kinematically consistent model framework fitted to ocean observations for the period 1992–2015. The depth‐integrated Norwegian Sea heat budget shows that both ocean advection and air‐sea heat fluxes play an active role in the formation of interannual heat content anomalies. A spatial analysis of the individual heat budget terms shows that ocean advection is the primary contributor to heat content variability in the Atlantic domain of the Norwegian Sea. Anomalous heat advection furthermore depends on the strength of the Atlantic water inflow, which is related to large‐scale circulation changes in the subpolar North Atlantic. This result suggests a potential for predicting Norwegian Sea heat content based on upstream conditions. However, local surface forcing (air‐sea heat fluxes and Ekman forcing) within the Norwegian Sea substantially modifies the phase and amplitude of ocean heat anomalies along their poleward pathway, and, hence, acts to limit predictability. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Asbjørnsen, Helene Årthun, Marius Skagseth, Øystein Eldevik, Tor |
spellingShingle |
Asbjørnsen, Helene Årthun, Marius Skagseth, Øystein Eldevik, Tor Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
author_facet |
Asbjørnsen, Helene Årthun, Marius Skagseth, Øystein Eldevik, Tor |
author_sort |
Asbjørnsen, Helene |
title |
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
title_short |
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
title_full |
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
title_fullStr |
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
title_full_unstemmed |
Mechanisms of Ocean Heat Anomalies in the Norwegian Sea |
title_sort |
mechanisms of ocean heat anomalies in the norwegian sea |
publisher |
Wiley |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/20665 https://doi.org/10.1029/2018jc014649 |
geographic |
Arctic Norwegian Sea |
geographic_facet |
Arctic Norwegian Sea |
genre |
Arctic North Atlantic Norwegian Sea Sea ice |
genre_facet |
Arctic North Atlantic Norwegian Sea Sea ice |
op_source |
Journal of Geophysical Research - Oceans |
op_relation |
Norges forskningsråd: 263223 Trond Mohn stiftelse: BFS2018TMT01 EC/H2020: 727852 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/20665 https://doi.org/10.1029/2018jc014649 cristin:1702862 |
op_rights |
Attribution-Non Commercial-No Derivatives CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2019 The Authors |
op_doi |
https://doi.org/10.1029/2018jc014649 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
4 |
container_start_page |
2908 |
op_container_end_page |
2923 |
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1766340767158108160 |