Decadal variability of subpolar gyre transport and its reveberation in the North Atlantic overturning..

Böning, Claus W. , Scheinert, Markus , Dengg, Joachim, Biastoch, Arne and Funk, Andreas (2006) Decadal variability of subpolar gyre transport and its reveberation in the North Atlantic overturning.. Open Access Geophysical Research Letters, 33 (L21S01). DOI 10.1029/2006GL026906.

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Supplementary data:

Abstract

Analyses of sea surface height (SSH) records based on satellite altimeter data and hydrographic properties have suggested a considerable weakening of the North Atlantic subpolar gyre during the 1990s. Here we report hindcast simulations with high-resolution ocean circulation models that demonstrate a close correspondence of the SSH changes with the volume transport of the boundary current system in the Labrador Sea. The 1990s-decline, of about 15% of the long-term mean, appears as part of a decadal variability of the gyre transport driven by changes in both heat flux and wind stress associated with the North Atlantic Oscillation (NAO). The changes in the subpolar gyre, as manifested in the deep western boundary current off Labrador, reverberate in the strength of the meridional overturning circulation (MOC) in the subtropical North Atlantic, suggesting the potential of a subpolar transport index as an element of a MOC monitoring system.

Document Type: Article
Keywords: subpolar gyre transport and its reveberation in the North Atlantic overturning
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2006GL026906
ISSN: 0094-8276
Projects: SFB460, DEKLIM
Date Deposited: 03 Dec 2008 16:52
Last Modified: 19 Feb 2018 12:52
URI: http://oceanrep.geomar.de/id/eprint/2517

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