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An air-sea feedback mechanism for quasi-geostrophic water movement near a fast shelf ice edge with a small curvature

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Author
Chu, Peter C.
Date
1987
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Abstract
An air-sea coupled model developed in this paper is intended to depict the generation of unstable coastal water waves near a fast shelf-ice edge with small curvature. Without any external forcing of the system, the unstable models are excited by the air-sea feedback mechanism. Thermally forced surface winds, generated by surface temperature gradient that is related to the vertical displacement by a surface temperature gradient that is related to the vertical displacement of the pycnocline, in turn produce a surface water current that further changes the vertical displacement of the pycnocline. The model consists of two elements: thermally forced surface air flow and mechanically driven coast water waves (Clarke). The two components are linked through the surface temperature gradient and surface wind stress. The coupled air-sea model is solved as an eigenvalue problem. It is found that the iceward convex ice-age, relatively thin ice, and small upper-layer water depth favor the generation of very unstable models. The influence of the coupling on the wave velocity is also discussed.
Description
Chinese Journal of the Atmospheric Sciences
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/36097
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