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Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre

Citation

Couldrey, MP and Jullion, L and Garabato, AC and Rye, C and Herraiz Borreguero, L and Brown, PJ and Meredith, MP and Speer, KL, Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre, Geophysical Research Letters, 40, (11) pp. 2755-2760. ISSN 0094-8276 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 American Geophysical Union

DOI: doi:10.1002/grl.50526

Abstract

Four repeat hydrographic sections across the eastern Weddell gyre at 30ºE reveal a warming (by ~0.1°C) and lightening (by ~0.02-0.03 kg m-3) of the Antarctic Bottom Water (AABW) entering the gyre from the Indian sector of the Southern Ocean between the mid-1990s and late 2000s.Historical hydrographic and altimetric measurements in the region suggest that the most likely explanation for the change is increased entrainment of warmer mid-depth Circumpolar Deep Water by cascading shelf water plumes close to Cape Darnley, where the Indian-sourced AABW entering the Weddell gyre from the east is ventilated. This change in entrainment is associated with a concurrent southward shift of the Antarctic Circumpolar Current’s (ACC) southern boundary in the region. This mechanism of AABW warming may affect wherever the ACC flows close to Antarctica.

Item Details

Item Type:Refereed Article
Keywords:Antarctic, bottom water, Weddell gyre
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
Author:Herraiz Borreguero, L (Dr Laura Herraiz Borreguero)
ID Code:84736
Year Published:2013
Web of Science® Times Cited:16
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-05-29
Last Modified:2015-07-24
Downloads:0

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