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South Atlantic overturning circulation at 24°S

South Atlantic overturning circulation at 24°S
South Atlantic overturning circulation at 24°S
To estimate the size of the meridional overturning circulation and the meridional heat and freshwater transports in the South Atlantic, we made a new transatlantic hydrographic section along 24°S in 2009 and we compare the resulting transports with those estimated for a historical section made in 1983. For the two sections, the overturning is estimated to be 21.5 Sv (2009) or 16.5 Sv (1983), the heat transport is northward at 0.7 PW (2009) or 0.4 PW (1983), and the freshwater transport is small but northward at 0.04 Sv (2009) or 0.17 Sv (1983). The differences in transports are primarily due to the different strengths of the southward Brazil Current transport during the occupation of the sections, 4.9 Sv (2009) or 12.3 Sv (1983). The freshwater transport associated with the meridional overturning circulation is estimated by two different methods for each of the two sections and is always southward ranging from -0.09 Sv to -0.34 Sv which means that the Atlantic meridional overturning circulation transports freshwater southward at 24°S. On the basis of theoretical studies, such southward freshwater transport at the southern boundary of the Atlantic Ocean means that the present Atlantic circulation has multiple equilibrium states, and that the one it occupies at present may be unstable to a sufficiently large freshwater event.
0022-2402
38-56
Bryden, Harry L.
7f823946-34e8-48a3-8bd4-a72d2d749184
King, Brian A.
960f44b4-cc9c-4f77-b3c8-775530ac0061
McCarthy, Gerard D.
99241bcb-5667-469d-b7ae-4d308d516bd6
Bryden, Harry L.
7f823946-34e8-48a3-8bd4-a72d2d749184
King, Brian A.
960f44b4-cc9c-4f77-b3c8-775530ac0061
McCarthy, Gerard D.
99241bcb-5667-469d-b7ae-4d308d516bd6

Bryden, Harry L., King, Brian A. and McCarthy, Gerard D. (2011) South Atlantic overturning circulation at 24°S. Journal of Marine Research, 69 (1), 38-56. (doi:10.1357/002224011798147633).

Record type: Article

Abstract

To estimate the size of the meridional overturning circulation and the meridional heat and freshwater transports in the South Atlantic, we made a new transatlantic hydrographic section along 24°S in 2009 and we compare the resulting transports with those estimated for a historical section made in 1983. For the two sections, the overturning is estimated to be 21.5 Sv (2009) or 16.5 Sv (1983), the heat transport is northward at 0.7 PW (2009) or 0.4 PW (1983), and the freshwater transport is small but northward at 0.04 Sv (2009) or 0.17 Sv (1983). The differences in transports are primarily due to the different strengths of the southward Brazil Current transport during the occupation of the sections, 4.9 Sv (2009) or 12.3 Sv (1983). The freshwater transport associated with the meridional overturning circulation is estimated by two different methods for each of the two sections and is always southward ranging from -0.09 Sv to -0.34 Sv which means that the Atlantic meridional overturning circulation transports freshwater southward at 24°S. On the basis of theoretical studies, such southward freshwater transport at the southern boundary of the Atlantic Ocean means that the present Atlantic circulation has multiple equilibrium states, and that the one it occupies at present may be unstable to a sufficiently large freshwater event.

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More information

Published date: January 2011
Organisations: Physical Oceanography, Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 205557
URI: https://eprints.soton.ac.uk/id/eprint/205557
ISSN: 0022-2402
PURE UUID: 92a7a086-ed1b-405a-97c0-6be3406c186e
ORCID for Harry L. Bryden: ORCID iD orcid.org/0000-0002-8216-6359

Catalogue record

Date deposited: 08 Dec 2011 14:11
Last modified: 01 Oct 2019 00:59

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