An air-sea feedback mechanism for quasi-geostrophic water movement near a fast shelf ice edge with a small curvature
Chu, Peter C.
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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.
Chinese Journal of the Atmospheric Sciences
RightsThis 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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