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Free Content A model for the inertial recirculation of a gyre

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Abstract:

This paper considers the "time-mean" circulation of wind-driven ocean gyres in the limit referred to as "inertial" or "almost-free." In this limit, potential vorticity is conserved following the flow with sources and sinks of potential vorticity balancing in an integral sense around the gyre. Approximate analytic solutions are obtained for a continuously stratified quasi-geostrophic ocean by neglecting the relative vorticity in the gyre interiors. The solutions have features similar to those found in the western part of ocean basins both in eddy-resolving numerical models and in observations. In particular, a deep westward recirculation, such as proposed by Worthington (1976) for the Gulf Stream system, arises naturally from the analysis as an enhanced barotropic flow inside the region where the "bowl" containing the circulation has intersected the ocean floor. This flow, which is driven by eddies and dissipated by bottom friction, leads to a sudden increase in westward velocity similar to that found between 35N and 36N in the long-term current records along 55W discussed by Schmitz (1977, 1978, 1980).

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/002224087788326821

Publication date: August 1, 1987

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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jmr/jmr/1987/00000045/00000003/art00005
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