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

Couldrey, Matthew P.; Jullion, Loic; Naveira Garabato, Alberto C.; Rye, Craig; Herraiz-Borreguero, Laura; Brown, Peter J.; Meredith, Michael P.; Speer, Kevin L.. 2013 Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre. Geophysical Research Letters, 40 (11). 2755-2760. 10.1002/grl.50526

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Abstract/Summary

Four repeat hydrographic sections across the eastern Weddell gyre at 30°E 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 Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/grl.50526
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Polar Oceans
ISSN: 0094-8276
Date made live: 25 Jul 2013 16:52 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/500831

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