Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea
The marine-terminating glaciers of the Amundsen Sea are experiencing increased basal melting associated with an inflow of warm and salty water from the deep ocean onto the shelf via submarine glacial troughs. Modelling work suggests that variability in the transport of this source of heat across the...
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2023
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017938 2023-08-27T04:03:51+02:00 Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea Dragomir, O. Silvano, A. Hogg, A. Meredith, M. Nurser, G. Naveira Garabato, A. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017938 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1663 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017938 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1663 2023-08-06T23:41:22Z The marine-terminating glaciers of the Amundsen Sea are experiencing increased basal melting associated with an inflow of warm and salty water from the deep ocean onto the shelf via submarine glacial troughs. Modelling work suggests that variability in the transport of this source of heat across the shelf-break and onto the Dotson Trough in the western Amundsen Sea is regulated by wind-driven changes in an eastward undercurrent that flows along the continental slope. What controls the strength and variability of the undercurrent, however, is not well documented due to a lack of observations in the region. Here, we use mooring records of undercurrent velocity near the shelf break in the Amundsen Sea throughs in conjunction with a novel 5-year altimetric sea level product that includes measurements in regions of near-perennial ice cover to describe the connection between undercurrent variability and climate on seasonal to interannual time scales. We find a robust signature of the undercurrent variability that is linked to both a circumpolar coastal sea level signal as well as to the sea level in a region offshore in the Amundsen Sea. We discuss the implications of the undercurrent-sea level covariability in the context of local and remote atmospheric forcing. Our study provides a nexus between intra-seasonal barotropic dynamics and timescales when the baroclinicity of the flow becomes dominant. Conference Object Amundsen Sea GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Amundsen Sea |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The marine-terminating glaciers of the Amundsen Sea are experiencing increased basal melting associated with an inflow of warm and salty water from the deep ocean onto the shelf via submarine glacial troughs. Modelling work suggests that variability in the transport of this source of heat across the shelf-break and onto the Dotson Trough in the western Amundsen Sea is regulated by wind-driven changes in an eastward undercurrent that flows along the continental slope. What controls the strength and variability of the undercurrent, however, is not well documented due to a lack of observations in the region. Here, we use mooring records of undercurrent velocity near the shelf break in the Amundsen Sea throughs in conjunction with a novel 5-year altimetric sea level product that includes measurements in regions of near-perennial ice cover to describe the connection between undercurrent variability and climate on seasonal to interannual time scales. We find a robust signature of the undercurrent variability that is linked to both a circumpolar coastal sea level signal as well as to the sea level in a region offshore in the Amundsen Sea. We discuss the implications of the undercurrent-sea level covariability in the context of local and remote atmospheric forcing. Our study provides a nexus between intra-seasonal barotropic dynamics and timescales when the baroclinicity of the flow becomes dominant. |
format |
Conference Object |
author |
Dragomir, O. Silvano, A. Hogg, A. Meredith, M. Nurser, G. Naveira Garabato, A. |
spellingShingle |
Dragomir, O. Silvano, A. Hogg, A. Meredith, M. Nurser, G. Naveira Garabato, A. Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
author_facet |
Dragomir, O. Silvano, A. Hogg, A. Meredith, M. Nurser, G. Naveira Garabato, A. |
author_sort |
Dragomir, O. |
title |
Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
title_short |
Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
title_full |
Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
title_fullStr |
Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
title_full_unstemmed |
Coastal and offshore controls on the variability of the Undercurrent in the Amundsen Sea |
title_sort |
coastal and offshore controls on the variability of the undercurrent in the amundsen sea |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017938 |
geographic |
Amundsen Sea |
geographic_facet |
Amundsen Sea |
genre |
Amundsen Sea |
genre_facet |
Amundsen Sea |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1663 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017938 |
op_doi |
https://doi.org/10.57757/IUGG23-1663 |
_version_ |
1775347142647349248 |