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

journal contribution
posted on 2023-05-17, 17:57 authored by Couldrey, MP, Jullion, L, Garabato, AC, Rye, C, Laura Herraiz-BorregueroLaura Herraiz-Borreguero, Brown, PJ, Meredith, MP, Speer, KL
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.

History

Publication title

Geophysical Research Letters

Volume

40

Issue

11

Pagination

2755-2760

ISSN

0094-8276

Department/School

Institute for Marine and Antarctic Studies

Publisher

Wiley-Blackwell Publishing, Inc.

Place of publication

United States

Rights statement

Copyright 2013 American Geophysical Union

Repository Status

  • Restricted

Socio-economic Objectives

Understanding climate change not elsewhere classified

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