Two layer model of the steady ocean response to large-scale heating and cooling |
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| Authors: | Shinya Minato |
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| Institution: | (1) Meteorological Research Institute, Nagamine 1-1, 305 Tsukuba-shi, Ibaraki, Japan |
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| Abstract: | Steady response of a linear, two-layer baroclinic ocean to a steady thermal forcing was investigated on a mid-latitude  -plane. Surface heat flux and its relaxation processes were parametrized as a form of heating function and Newtonian cooling term of cross interfacial velocityw in the continuity equation. Ageostrophic linear drag terms were employed to represent the western boundary layer for accomplishment of the steady circulation in the closed domain. In the interior, the dynamics belongs to thef-plane regime. The flow in the upper layer is zonal and eastward, which is the same as that expected in the channel without meridional boundary. The eastern boundary region is the so called  Sverdrup region , in which the vortex stretching balances the term, thoughw contains a damping term. It directs the zonal flow southward (northward) in the south (north) followed by upwelling (downwelling) and forms the two gyres. Western boundary region is of the Stommel type except the upwelling (downwelling) in the south (north). The meridional circulation is similar to the Hadley Cell except southern and northern boundary layers. However, its strength is much greater than the latters. |
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