Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre
Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre
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.
AABW, ACC, Southern Ocean, Cape Darnley
2755-2760
Couldrey, Matthew P.
8b4a79ca-0ba6-4c2f-b4e0-8934242497b5
Jullion, Loïc
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Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Rye, Craig
8aa2034e-ef54-4dcc-bddb-a6d481ea29e9
Herraiz-Borreguero, Laura
faa962ba-19f8-4cf3-83be-ee4972fdbe9f
Brown, Peter J.
29f4e81e-e0c4-4147-984b-0215571fb2ca
Meredith, Michael P.
25fd5f1c-f3ed-40a2-af59-5a7074a25fcd
Speer, Kevin L.
ea8bbf99-6ecf-4ada-aac3-84e779f2fb09
16 June 2013
Couldrey, Matthew P.
8b4a79ca-0ba6-4c2f-b4e0-8934242497b5
Jullion, Loïc
e72025ed-bc3d-4c9f-a78e-4b41cb1c6da9
Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Rye, Craig
8aa2034e-ef54-4dcc-bddb-a6d481ea29e9
Herraiz-Borreguero, Laura
faa962ba-19f8-4cf3-83be-ee4972fdbe9f
Brown, Peter J.
29f4e81e-e0c4-4147-984b-0215571fb2ca
Meredith, Michael P.
25fd5f1c-f3ed-40a2-af59-5a7074a25fcd
Speer, Kevin L.
ea8bbf99-6ecf-4ada-aac3-84e779f2fb09
Couldrey, Matthew P., Jullion, Loïc, Naveira Garabato, Alberto C., Rye, Craig, Herraiz-Borreguero, Laura, Brown, Peter J., Meredith, Michael P. and Speer, Kevin L.
(2013)
Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre.
Geophysical Research Letters, 40 (11), .
(doi:10.1002/grl.50526).
Abstract
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.
Text
grl50526.pdf
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Published date: 16 June 2013
Keywords:
AABW, ACC, Southern Ocean, Cape Darnley
Organisations:
Physical Oceanography
Identifiers
Local EPrints ID: 355047
URI: http://eprints.soton.ac.uk/id/eprint/355047
ISSN: 0094-8276
PURE UUID: 4ef55a4d-824e-4dd3-a646-bf7414d53543
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Date deposited: 26 Jul 2013 09:07
Last modified: 15 Mar 2024 03:24
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Contributors
Author:
Matthew P. Couldrey
Author:
Loïc Jullion
Author:
Craig Rye
Author:
Laura Herraiz-Borreguero
Author:
Peter J. Brown
Author:
Michael P. Meredith
Author:
Kevin L. Speer
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