Effects of topography on the beta-drift of a baroclinic vortex
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ID: 308427
2001
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Abstract
The propagation of compact, surface-intensie ed vortices over a topographic slope on the beta-plane is studied in the framework of a two-layer model. A perturbation theory is derived for a circular vortex in the upper layer with the lower layer at rest as a basic state. An integral momentum balance for the upper layer is used to obtain expressions for the velocity of the vortex center assuming the e ow is quasi-stationary to leading order. This approach allows the calculation of the lower-layer e ow pattern as a function of the interface shape and the slope orientation. The essential part of the lower-layer e ow pattern is elongated dipolar gyres generated by the cross-slope vortex drift which remains nearly the same as in the reduced-gravity approximation, although it is slightly modie ed when the slope is not constant. Therefore, the major effect of the lower-layer e ow is an additional along-slope propagation which is proportional to the cross-slope speed and the ratio of the interface slope to the topographic slope. Both along-slope and cross-slope drift components are found to be also affected by the slope variation.
| Reference Key |
openalex_W1995366678
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|---|---|
| Authors | G. G. Sutyrin |
| Journal | journal of marine research |
| Year | 2001 |
| DOI |
10.1357/00222400160497733
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| URL | |
| Keywords | Keywords not found |
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