An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf
Mass loss from the Antarctic Ice Sheet is dominated by basal melting–induced warm ocean water. Ice-sheet mass loss and thinning of buttressing ice shelves occur primarily in the Amundsen and Bellingshausen Seas. Here, we show that in a global ocean simulation using the 0.25° Nucleus for European Mod...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/536331/ https://nora.nerc.ac.uk/id/eprint/536331/1/s10236-023-01587-3.pdf https://link.springer.com/article/10.1007/s10236-023-01587-3 |
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ftnerc:oai:nora.nerc.ac.uk:536331 2024-02-11T09:55:17+01:00 An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf Drijfhout, S.S. Bull, C.Y.S. Hewitt, H. Holland, P.R. Jenkins, A. Mathiot, P. Garabato, A.N. 2024-01 text http://nora.nerc.ac.uk/id/eprint/536331/ https://nora.nerc.ac.uk/id/eprint/536331/1/s10236-023-01587-3.pdf https://link.springer.com/article/10.1007/s10236-023-01587-3 en eng Springer https://nora.nerc.ac.uk/id/eprint/536331/1/s10236-023-01587-3.pdf Drijfhout, S.S.; Bull, C.Y.S.; Hewitt, H.; Holland, P.R. orcid:0000-0001-8370-289X Jenkins, A.; Mathiot, P.; Garabato, A.N. 2024 An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf. Ocean Dynamics, 74. 37-52. https://doi.org/10.1007/s10236-023-01587-3 <https://doi.org/10.1007/s10236-023-01587-3> cc_by_4 Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1007/s10236-023-01587-3 2024-01-12T00:03:13Z Mass loss from the Antarctic Ice Sheet is dominated by basal melting–induced warm ocean water. Ice-sheet mass loss and thinning of buttressing ice shelves occur primarily in the Amundsen and Bellingshausen Seas. Here, we show that in a global ocean simulation using the 0.25° Nucleus for European Modeling of Ocean (NEMO) model driven by the JRA55 reanalysis from 1982 to 2017, the Amundsen sector of the Antarctic continental shelf acts as a gateway, regulating the on-shelf access of warm Circumpolar Deep Water (CDW) from the deep ocean and its westward transfer to other sectors up to ca. 90° E, particularly the Ross Sea. As a result, anomalies in Antarctic-shelf-averaged temperature mainly originate in the Amundsen sector. These changes are primarily governed by shifts in the Amundsen Sea Low associated with tropical climate variability, modulating the on-shelf transport of CDW via wind-driven perturbations to ocean currents. The ensuing temperature anomalies progress westward from the Amundsen Sea via three distinct routes: a slow, convoluted westward pathway on the shelf via the Antarctic Coastal Current; a faster westward pathway along the shelf break via the Antarctic Slope Current and then onto the shelf along topographic troughs; and a third, eastward route toward the Bellingshausen sector, whereby temperature anomalies are transported into a region of local wind-generated changes farther north. These results emphasize the importance of the Amundsen sector for climate variability over the Antarctic shelves. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Ross Sea Natural Environment Research Council: NERC Open Research Archive Amundsen Sea Antarctic Ross Sea The Antarctic Ocean Dynamics |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Mass loss from the Antarctic Ice Sheet is dominated by basal melting–induced warm ocean water. Ice-sheet mass loss and thinning of buttressing ice shelves occur primarily in the Amundsen and Bellingshausen Seas. Here, we show that in a global ocean simulation using the 0.25° Nucleus for European Modeling of Ocean (NEMO) model driven by the JRA55 reanalysis from 1982 to 2017, the Amundsen sector of the Antarctic continental shelf acts as a gateway, regulating the on-shelf access of warm Circumpolar Deep Water (CDW) from the deep ocean and its westward transfer to other sectors up to ca. 90° E, particularly the Ross Sea. As a result, anomalies in Antarctic-shelf-averaged temperature mainly originate in the Amundsen sector. These changes are primarily governed by shifts in the Amundsen Sea Low associated with tropical climate variability, modulating the on-shelf transport of CDW via wind-driven perturbations to ocean currents. The ensuing temperature anomalies progress westward from the Amundsen Sea via three distinct routes: a slow, convoluted westward pathway on the shelf via the Antarctic Coastal Current; a faster westward pathway along the shelf break via the Antarctic Slope Current and then onto the shelf along topographic troughs; and a third, eastward route toward the Bellingshausen sector, whereby temperature anomalies are transported into a region of local wind-generated changes farther north. These results emphasize the importance of the Amundsen sector for climate variability over the Antarctic shelves. |
format |
Article in Journal/Newspaper |
author |
Drijfhout, S.S. Bull, C.Y.S. Hewitt, H. Holland, P.R. Jenkins, A. Mathiot, P. Garabato, A.N. |
spellingShingle |
Drijfhout, S.S. Bull, C.Y.S. Hewitt, H. Holland, P.R. Jenkins, A. Mathiot, P. Garabato, A.N. An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
author_facet |
Drijfhout, S.S. Bull, C.Y.S. Hewitt, H. Holland, P.R. Jenkins, A. Mathiot, P. Garabato, A.N. |
author_sort |
Drijfhout, S.S. |
title |
An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
title_short |
An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
title_full |
An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
title_fullStr |
An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
title_full_unstemmed |
An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf |
title_sort |
amundsen sea source of decadal temperature changes on the antarctic continental shelf |
publisher |
Springer |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/536331/ https://nora.nerc.ac.uk/id/eprint/536331/1/s10236-023-01587-3.pdf https://link.springer.com/article/10.1007/s10236-023-01587-3 |
geographic |
Amundsen Sea Antarctic Ross Sea The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Ross Sea The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Ross Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelves Ross Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/536331/1/s10236-023-01587-3.pdf Drijfhout, S.S.; Bull, C.Y.S.; Hewitt, H.; Holland, P.R. orcid:0000-0001-8370-289X Jenkins, A.; Mathiot, P.; Garabato, A.N. 2024 An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf. Ocean Dynamics, 74. 37-52. https://doi.org/10.1007/s10236-023-01587-3 <https://doi.org/10.1007/s10236-023-01587-3> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1007/s10236-023-01587-3 |
container_title |
Ocean Dynamics |
_version_ |
1790594874229129216 |