Observed and modelled stability of overflow across the Greenland–Scotland ridge

Steffen M. Olsen (), Bogi Hansen, Detlef Quadfasel and Svein Østerhus
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Steffen M. Olsen: Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark
Bogi Hansen: Faroese Fisheries Laboratory, Box 3051, FO-110 Tórshavn, Faroe Islands
Detlef Quadfasel: Universität Hamburg, Zentrum für Meeres- und Klimaforschung, Bundesstrasse 53, D-20146 Hamburg, Germany
Svein Østerhus: Bjerknes Centre for Climate Research, University of Bergen

Nature, 2008, vol. 455, issue 7212, 519-522

Abstract: North Atlantic flows: steady as she goes The continuous flow, or 'overflow' of cold dense water from the Nordic seas, across the Greenland–Scotland ridge and into the Atlantic Ocean is a substantial contributor to the production of the North Atlantic 'deep water' that feeds the lower limb of the Atlantic meridional overturning circulation. The two main overflow branches pass the Denmark strait and the Faroe Bank channel. Steffen Olsen et al. present the results of direct current measurements in the Faroe Bank channel between 1995 and 2005, combined with ocean general circulation model simulations. In contrast to earlier reports that the overflow has weakened in the past 50 years, they find that overflow of the Faroe Bank channel, and also the total overflow, are in fact stable, though the model does show a weakening total Atlantic meridional overturning circulation due to changes south of the Greenland-Scotland Ridge.

Date: 2008
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DOI: 10.1038/nature07302

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