Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low
The changing supply of warm Circumpolar Deep Water (CDW) to the West Antarctic continental shelf is responsible for the basal melting and thinning of the West Antarctic ice shelves that has occurred in recent decades. Here, we assess the variability in CDW supply, and its drivers, from a multi‐year...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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American Geophysical Union
2020
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Online Access: | http://nora.nerc.ac.uk/id/eprint/528346/ https://nora.nerc.ac.uk/id/eprint/528346/1/2020JC016113.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016113 |
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ftnerc:oai:nora.nerc.ac.uk:528346 2024-02-11T09:55:17+01:00 Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low Dotto, Tiago S. Naveira Garabato, Alberto C. Wåhlin, Anna K. Bacon, Sheldon Holland, Paul Kimura, Satoshi Tsamados, Michel Herraiz‐Borreguero, Laura Kalén, Ola Jenkins, Adrian 2020-08-18 text http://nora.nerc.ac.uk/id/eprint/528346/ https://nora.nerc.ac.uk/id/eprint/528346/1/2020JC016113.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016113 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/528346/1/2020JC016113.pdf Dotto, Tiago S.; Naveira Garabato, Alberto C.; Wåhlin, Anna K.; Bacon, Sheldon orcid:0000-0002-2471-9373 Holland, Paul orcid:0000-0001-8370-289X Kimura, Satoshi; Tsamados, Michel; Herraiz‐Borreguero, Laura; Kalén, Ola; Jenkins, Adrian orcid:0000-0002-9117-0616 . 2020 Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low. Journal of Geophysical Research: Oceans, 125 (8), e2020JC016113. 19, pp. https://doi.org/10.1029/2020JC016113 <https://doi.org/10.1029/2020JC016113> cc_by_4 Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1029/2020JC016113 2024-01-19T00:03:17Z The changing supply of warm Circumpolar Deep Water (CDW) to the West Antarctic continental shelf is responsible for the basal melting and thinning of the West Antarctic ice shelves that has occurred in recent decades. Here, we assess the variability in CDW supply, and its drivers, from a multi‐year mooring deployed in, and a regional ocean model spanning, the Getz‐Dotson Trough, Amundsen Sea. Between 2010 to 2015, the CDW within the trough underwent a pronounced cooling and freshening, associated with changes in thermohaline properties on isopycnals. Variability in the rate of CDW inflow is controlled by local wind forcing of a shelf break undercurrent, which determines the hydrographic properties of inflowing CDW via tilting of density surfaces above the continental slope. Local wind is coupled to the Amundsen Sea Low (ASL) low‐pressure system, which is modulated by large‐scale climatic modes via atmospheric teleconnections. For the period analysed, a deeper ASL was associated with westward wind anomaly at the shelf break. Changes in the sea surface slope decelerated the shelf break undercurrent, resulting in less heat accessing the continental shelf and, consequently, a cooling of the Getz‐Dotson Trough. Therefore, the present work suggests that the fate of the West Antarctic ice shelves is closely tied to the future evolution of the ASL. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Shelves Natural Environment Research Council: NERC Open Research Archive Antarctic Amundsen Sea Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Journal of Geophysical Research: Oceans 125 8 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The changing supply of warm Circumpolar Deep Water (CDW) to the West Antarctic continental shelf is responsible for the basal melting and thinning of the West Antarctic ice shelves that has occurred in recent decades. Here, we assess the variability in CDW supply, and its drivers, from a multi‐year mooring deployed in, and a regional ocean model spanning, the Getz‐Dotson Trough, Amundsen Sea. Between 2010 to 2015, the CDW within the trough underwent a pronounced cooling and freshening, associated with changes in thermohaline properties on isopycnals. Variability in the rate of CDW inflow is controlled by local wind forcing of a shelf break undercurrent, which determines the hydrographic properties of inflowing CDW via tilting of density surfaces above the continental slope. Local wind is coupled to the Amundsen Sea Low (ASL) low‐pressure system, which is modulated by large‐scale climatic modes via atmospheric teleconnections. For the period analysed, a deeper ASL was associated with westward wind anomaly at the shelf break. Changes in the sea surface slope decelerated the shelf break undercurrent, resulting in less heat accessing the continental shelf and, consequently, a cooling of the Getz‐Dotson Trough. Therefore, the present work suggests that the fate of the West Antarctic ice shelves is closely tied to the future evolution of the ASL. |
format |
Article in Journal/Newspaper |
author |
Dotto, Tiago S. Naveira Garabato, Alberto C. Wåhlin, Anna K. Bacon, Sheldon Holland, Paul Kimura, Satoshi Tsamados, Michel Herraiz‐Borreguero, Laura Kalén, Ola Jenkins, Adrian |
spellingShingle |
Dotto, Tiago S. Naveira Garabato, Alberto C. Wåhlin, Anna K. Bacon, Sheldon Holland, Paul Kimura, Satoshi Tsamados, Michel Herraiz‐Borreguero, Laura Kalén, Ola Jenkins, Adrian Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
author_facet |
Dotto, Tiago S. Naveira Garabato, Alberto C. Wåhlin, Anna K. Bacon, Sheldon Holland, Paul Kimura, Satoshi Tsamados, Michel Herraiz‐Borreguero, Laura Kalén, Ola Jenkins, Adrian |
author_sort |
Dotto, Tiago S. |
title |
Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
title_short |
Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
title_full |
Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
title_fullStr |
Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
title_full_unstemmed |
Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low |
title_sort |
control of the oceanic heat content of the getz‐dotson trough, antarctica, by the amundsen sea low |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528346/ https://nora.nerc.ac.uk/id/eprint/528346/1/2020JC016113.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016113 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) ENVELOPE(-145.217,-145.217,-76.550,-76.550) |
geographic |
Antarctic Amundsen Sea Tilting Getz |
geographic_facet |
Antarctic Amundsen Sea Tilting Getz |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelves |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelves |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528346/1/2020JC016113.pdf Dotto, Tiago S.; Naveira Garabato, Alberto C.; Wåhlin, Anna K.; Bacon, Sheldon orcid:0000-0002-2471-9373 Holland, Paul orcid:0000-0001-8370-289X Kimura, Satoshi; Tsamados, Michel; Herraiz‐Borreguero, Laura; Kalén, Ola; Jenkins, Adrian orcid:0000-0002-9117-0616 . 2020 Control of the oceanic heat content of the Getz‐Dotson Trough, Antarctica, by the Amundsen Sea Low. Journal of Geophysical Research: Oceans, 125 (8), e2020JC016113. 19, pp. https://doi.org/10.1029/2020JC016113 <https://doi.org/10.1029/2020JC016113> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1029/2020JC016113 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
8 |
_version_ |
1790594867899924480 |