| EFFECTS OF OROGRAPHY AND AIR FLOW IN EKMAN BOUNDARY LAYER |
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| 作者姓名： | 伍荣生 |
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| 作者单位： | Department of |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China under Contract 4860222. |
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| 摘 要： | It is convenient to use σ-coordinates to discuss the dynamic effect of orography and the flow inEkman boundary layer.In this paper,the theory of mixing length is generalized to the σ-coordinate system.Then the governing equations,describing the motion in the boundary layer over the mountain regions arederived.The features of flow in the boundary layer,especially the effects of Ekman pumping,are discussed indetails.It is pointed out that there are three factors affecting the vertical motion at the top of the boun-dary layer:(1)vorticity distribution in the boundary layer,which is directly related to the divergence andconvergence of air flow caused by friction,(2)the upslope or downslope motion of flow over the mountainslopes,and(3)the mutual effect of orography and friction induced by the ageostrophic component climbing up-ward or downward in the boundary layer over mountain regions.
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EFFECTS OF OROGRAPHY AND AIR FLOW IN EKMAN BOUNDARY LAYER |
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| Wu Rongsheng.EFFECTS OF OROGRAPHY AND AIR FLOW IN EKMAN BOUNDARY LAYER[J].Acta Meteorologica Sinica,1991(1). |
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| Authors: | Wu Rongsheng |
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| Institution: | Wu Rongsheng Department of Atmospheric Sciences,Nanjing University,Nanjing |
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| Abstract: | |
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| Keywords: | effects of orography air flow boundary layer Ekman pumping |
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