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 R., Kimura, Satoshi, Tsamados, Michel, Herraiz-Borreguero, Laura, Kalén, Ola and Jenkins, Adrian (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). ISSN 2169-9275

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Abstract

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 multiyear 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 analyzed, 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.

Item Type: Article
Uncontrolled Keywords: circumpolar deep water,southern ocean,west antarctic ice shelves,atmospheric teleconnections,open ocean-shelf exchange,geochemistry and petrology,geophysics,earth and planetary sciences (miscellaneous),space and planetary science,oceanography ,/dk/atira/pure/subjectarea/asjc/1900/1906
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 27 Jul 2021 00:04
Last Modified: 08 Sep 2021 01:59
URI: https://ueaeprints.uea.ac.uk/id/eprint/80766
DOI: 10.1029/2020JC016113

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