Circulation characteristics in three eddy-permitting models of the North Atlantic

Willebrand, Jürgen; Barnier, Bernard; Böning, Claus; Dieterich, Christian; Killworth, Peter D.; Le Provost, Christian; Jia, Yanli; Molines, Jean-Marc; New, Adrian L.. 2001 Circulation characteristics in three eddy-permitting models of the North Atlantic. Progress in Oceanography, 48 (2/3). 123-161.

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A systematic intercomparison of three realistic eddy-permitting models of the North Atlantic circulation has been performed. The models use different concepts for the discretization of the vertical coordinate, namely geopotential levels, isopycnal layers, terrain-following (sigma) coordinates, respectively. Although these models were integrated under nearly identical conditions, the resulting large-scale model circulations show substantial differences. The results demonstrate that the large-scale thermohaline circulation is very sensitive to the model representation of certain localised processes, in particular to the amount and water mass properties of the overflow across the Greenland-Scotland region, to the amount of mixing within a few hundred kilometers south of the sills, and to several other processes at small or sub-grid scales. The different behaviour of the three models can to a large extent be explained as a consequence of the different model representation of these processes.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0079-6611
Date made live: 26 Jan 2004 +0 (UTC)

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