Modelling the Overflows Across the Greenland–Scotland Ridge.

Jungclaus, Johann H., Macrander, Andreas and Käse, Rolf H. (2008) Modelling the Overflows Across the Greenland–Scotland Ridge. In: Arctic–Subarctic Ocean Fluxes. , ed. by Dickson, Robert R., Meincke, Jens and Rhines, Peter. Springer, Heidelberg, Germany, pp. 527-549. ISBN 978-1-4020-6773-0 DOI 10.1007/978-1-4020-6774-7_23.

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Abstract

The Atlantic Meridional Overturning Circulation (AMOC) is part of a global redistribution system in the ocean that carries vast amounts of mass, heat, and freshwater. Within the AMOC, water mass transformations in the Nordic Seas (NS) and the overflows across the Greenland-Scotland Ridge (GSR) contribute significantly to the overturning mass transport. The deep NS are separated by the GSR from direct exchange with the subpolar North Atlantic. Two deeper passages, Denmark Strait (DS, sill depth 630 m) and Faroe Bank Channel (FBC, sill depth 840 m), constrain the deep outflow. The outflow transports are assumed to be governed by hydraulic control (Whitehead 1989, 1998). According to the circulation scheme by Dickson and Brown (1994), there is an overflow of 2.9 Sv (1 Sv = 1 Sverdrup = 106 m3 s–1) through DS, 1.7 Sv through FBC and another 1 Sv from flow across the Iceland%Faroe Ridge (IFR). To the south of the GSR, the overflows sink to depth and then spread along the topography, eventually merging to form a deep boundary current in the western Irminger Sea. During the descent, the dense bottom water flow doubles its volume by entrainment of ambient waters (e.g. Price and Baringer 1994) so that there is a deep water transport of 13.3 Sv once the boundary current reaches Cape Farvel (Dickson and Brown 1994). Thus the overflows and the overflow-related part of the AMOC account for more than 70% of the maximum total overturning, which is estimated from observations to be about 18 Sv (e.g. Macdonald 1998)

Document Type: Book chapter
Keywords: POS262; POSEIDON
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
AWI
Open Access Journal?: No
DOI etc.: 10.1007/978-1-4020-6774-7_23
Expeditions/Models/Experiments:
Date Deposited: 23 Sep 2015 10:04
Last Modified: 23 Sep 2015 10:04
URI: http://oceanrep.geomar.de/id/eprint/29769

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