Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change
This work was funded by NSF's Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under NSF Award PLR-1425989, with additional support from NOAA and NASA. Logistical support for SOCCOM in the Antarctic was provided by the U.S. NSF through the U.S. Antarctic Program. Thi...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | http://hdl.handle.net/10023/26404 https://doi.org/10.1029/2021JC017608 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/26404 |
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openpolar |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Antarctic Slope Current Climate modeling Southern Ocean Ocean circulation GE Environmental Sciences DAS SDG 13 - Climate Action GE |
spellingShingle |
Antarctic Slope Current Climate modeling Southern Ocean Ocean circulation GE Environmental Sciences DAS SDG 13 - Climate Action GE Beadling, R. L. Krasting, J. P. Griffies, S. M. Hurlin, W. J. Bronselaer, B. Russell, J. L. MacGilchrist, G. A. Tesdal, J. -E. Winton, M. Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
topic_facet |
Antarctic Slope Current Climate modeling Southern Ocean Ocean circulation GE Environmental Sciences DAS SDG 13 - Climate Action GE |
description |
This work was funded by NSF's Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under NSF Award PLR-1425989, with additional support from NOAA and NASA. Logistical support for SOCCOM in the Antarctic was provided by the U.S. NSF through the U.S. Antarctic Program. This work was also supported by the U.S. DOE Subcontract no. B640108 under Prime Contract no. DE-AC52-07NA27344. RLB was additionally supported by the NOAA Climate and Global Change Postdoctoral Fellowship Award. Computational resources for the SOSE were provided by NSF XSEDE resource grant OCE130007. We use two coupled climate models, GFDL-CM4 and GFDL-ESM4, to investigate the physical response of the Southern Ocean to changes in surface wind stress, Antarctic meltwater, and the combined forcing of the two in a pre-industrial control simulation. The meltwater cools the ocean surface in all regions except the Weddell Sea, where the wind stress warms the near-surface layer. The limited sensitivity of the Weddell Sea surface layer to the meltwater is due to the spatial distribution of the meltwater fluxes, regional bathymetry, and large-scale circulation patterns. The meltwater forcing dominates the Antarctic shelf response and the models yield strikingly different responses along West Antarctica. The disagreement is attributable to the mean-state representation and meltwater-driven acceleration of the Antarctic Slope Current (ASC). In CM4, the meltwater is efficiently trapped on the shelf by a well resolved, strong, and accelerating ASC which isolates the West Antarctic shelf from warm offshore waters, leading to strong subsurface cooling. In ESM4, a weaker and diffuse ASC allows more meltwater to escape to the open ocean, the West Antarctic shelf does not become isolated, and instead strong subsurface warming occurs. The CM4 results suggest a possible negative feedback mechanism that acts to limit future melting, while the ESM4 results suggest a possible positive feedback mechanism that acts to accelerate melt. Our results ... |
author2 |
University of St Andrews. School of Earth & Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Beadling, R. L. Krasting, J. P. Griffies, S. M. Hurlin, W. J. Bronselaer, B. Russell, J. L. MacGilchrist, G. A. Tesdal, J. -E. Winton, M. |
author_facet |
Beadling, R. L. Krasting, J. P. Griffies, S. M. Hurlin, W. J. Bronselaer, B. Russell, J. L. MacGilchrist, G. A. Tesdal, J. -E. Winton, M. |
author_sort |
Beadling, R. L. |
title |
Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
title_short |
Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
title_full |
Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
title_fullStr |
Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
title_full_unstemmed |
Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change |
title_sort |
importance of the antarctic slope current in the southern ocean response to ice sheet melt and wind stress change |
publishDate |
2022 |
url |
http://hdl.handle.net/10023/26404 https://doi.org/10.1029/2021JC017608 |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Weddell Sea West Antarctica |
op_relation |
Journal of Geophysical Research: Oceans Beadling , R L , Krasting , J P , Griffies , S M , Hurlin , W J , Bronselaer , B , Russell , J L , MacGilchrist , G A , Tesdal , J -E & Winton , M 2022 , ' Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change ' , Journal of Geophysical Research: Oceans , vol. 127 , no. 5 , e2021JC017608 . https://doi.org/10.1029/2021JC017608 2169-9275 PURE: 281879061 PURE UUID: d53034b4-7db3-4162-bfdd-b8fa6c957a8b WOS: 000798227700001 Scopus: 85130601706 ORCID: /0000-0003-1409-8937/work/121754028 http://hdl.handle.net/10023/26404 https://doi.org/10.1029/2021JC017608 |
op_rights |
Copyright © 2022. American Geophysical Union. All Rights Reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2021JC017608. |
op_doi |
https://doi.org/10.1029/2021JC017608 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
5 |
_version_ |
1770274616287166464 |
spelling |
ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/26404 2023-07-02T03:30:25+02:00 Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change Beadling, R. L. Krasting, J. P. Griffies, S. M. Hurlin, W. J. Bronselaer, B. Russell, J. L. MacGilchrist, G. A. Tesdal, J. -E. Winton, M. University of St Andrews. School of Earth & Environmental Sciences 2022-11-16 33 application/pdf http://hdl.handle.net/10023/26404 https://doi.org/10.1029/2021JC017608 eng eng Journal of Geophysical Research: Oceans Beadling , R L , Krasting , J P , Griffies , S M , Hurlin , W J , Bronselaer , B , Russell , J L , MacGilchrist , G A , Tesdal , J -E & Winton , M 2022 , ' Importance of the Antarctic Slope Current in the Southern Ocean response to ice sheet melt and wind stress change ' , Journal of Geophysical Research: Oceans , vol. 127 , no. 5 , e2021JC017608 . https://doi.org/10.1029/2021JC017608 2169-9275 PURE: 281879061 PURE UUID: d53034b4-7db3-4162-bfdd-b8fa6c957a8b WOS: 000798227700001 Scopus: 85130601706 ORCID: /0000-0003-1409-8937/work/121754028 http://hdl.handle.net/10023/26404 https://doi.org/10.1029/2021JC017608 Copyright © 2022. American Geophysical Union. All Rights Reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2021JC017608. Antarctic Slope Current Climate modeling Southern Ocean Ocean circulation GE Environmental Sciences DAS SDG 13 - Climate Action GE Journal article 2022 ftstandrewserep https://doi.org/10.1029/2021JC017608 2023-06-13T18:28:17Z This work was funded by NSF's Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under NSF Award PLR-1425989, with additional support from NOAA and NASA. Logistical support for SOCCOM in the Antarctic was provided by the U.S. NSF through the U.S. Antarctic Program. This work was also supported by the U.S. DOE Subcontract no. B640108 under Prime Contract no. DE-AC52-07NA27344. RLB was additionally supported by the NOAA Climate and Global Change Postdoctoral Fellowship Award. Computational resources for the SOSE were provided by NSF XSEDE resource grant OCE130007. We use two coupled climate models, GFDL-CM4 and GFDL-ESM4, to investigate the physical response of the Southern Ocean to changes in surface wind stress, Antarctic meltwater, and the combined forcing of the two in a pre-industrial control simulation. The meltwater cools the ocean surface in all regions except the Weddell Sea, where the wind stress warms the near-surface layer. The limited sensitivity of the Weddell Sea surface layer to the meltwater is due to the spatial distribution of the meltwater fluxes, regional bathymetry, and large-scale circulation patterns. The meltwater forcing dominates the Antarctic shelf response and the models yield strikingly different responses along West Antarctica. The disagreement is attributable to the mean-state representation and meltwater-driven acceleration of the Antarctic Slope Current (ASC). In CM4, the meltwater is efficiently trapped on the shelf by a well resolved, strong, and accelerating ASC which isolates the West Antarctic shelf from warm offshore waters, leading to strong subsurface cooling. In ESM4, a weaker and diffuse ASC allows more meltwater to escape to the open ocean, the West Antarctic shelf does not become isolated, and instead strong subsurface warming occurs. The CM4 results suggest a possible negative feedback mechanism that acts to limit future melting, while the ESM4 results suggest a possible positive feedback mechanism that acts to accelerate melt. Our results ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Weddell Sea West Antarctica University of St Andrews: Digital Research Repository Antarctic Southern Ocean The Antarctic Weddell Weddell Sea West Antarctica Journal of Geophysical Research: Oceans 127 5 |