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Changes in MOC and gyre-induced Atlantic Ocean heat transport

Changes in MOC and gyre-induced Atlantic Ocean heat transport
Changes in MOC and gyre-induced Atlantic Ocean heat transport
Anthropogenic change of the Atlantic meridional ocean heat transport (AOHT) is diagnosed from a large ensemble of climate simulations over the period 1940–2080, as well as its relation to changes in the Meridional Overturning Circulation (MOC) and the gyre circulation in the Atlantic. Internal variability in AOHT is closely associated with MOC variability. The anthropogenic change in AOHT, however, does not follow the forced decrease in the MOC. Thermohaline changes in the intermediate and deep water masses that are formed in the subpolar gyre cause the vertical temperature gradient near the western boundary to increase. As a result, the heat transport by the baroclinic gyre component largely compensates the decreased heat transport by the MOC.
0094-8276
L07707-[4pp]
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Hazeleger, W.
0bd826a1-4713-43ab-aace-3ea59d2fc37e
Drijfhout, S.S.
a5c76079-179b-490c-93fe-fc0391aacf13
Hazeleger, W.
0bd826a1-4713-43ab-aace-3ea59d2fc37e

Drijfhout, S.S. and Hazeleger, W. (2006) Changes in MOC and gyre-induced Atlantic Ocean heat transport. Geophysical Research Letters, 33 (7), L07707-[4pp]. (doi:10.1029/2006GL025807).

Record type: Article

Abstract

Anthropogenic change of the Atlantic meridional ocean heat transport (AOHT) is diagnosed from a large ensemble of climate simulations over the period 1940–2080, as well as its relation to changes in the Meridional Overturning Circulation (MOC) and the gyre circulation in the Atlantic. Internal variability in AOHT is closely associated with MOC variability. The anthropogenic change in AOHT, however, does not follow the forced decrease in the MOC. Thermohaline changes in the intermediate and deep water masses that are formed in the subpolar gyre cause the vertical temperature gradient near the western boundary to increase. As a result, the heat transport by the baroclinic gyre component largely compensates the decreased heat transport by the MOC.

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Published date: April 2006
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 349157
URI: http://eprints.soton.ac.uk/id/eprint/349157
ISSN: 0094-8276
PURE UUID: 70118094-fe84-4204-85ab-5adf29c64ae6

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Date deposited: 26 Feb 2013 10:54
Last modified: 27 Apr 2022 06:15

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Contributors

Author: S.S. Drijfhout
Author: W. Hazeleger

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