EFFECTS OF OROGRAPHY AND AIR FLOW IN EKMAN BOUNDARY LAYER

作     者：伍荣生 

作者机构：Department of Atmospheric SciencesNanjing UniversityNanjing 

出 版 物：《Acta meteorologica Sinica》 (气象学报(英文版))

年 卷 期：1991年第5卷第1期

页      面：62-70页

学科分类：07[理学] 0707[理学-海洋科学] 070601[理学-气象学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0824[工学-船舶与海洋工程] 0825[工学-航空宇航科学与技术] 

基　　金：This work was supported by the National Natural Science Foundation of China under Contract 4860222 

主　　题：effects of orography air flow boundary layer Ekman pumping 

摘      要：It is convenient to use σ-coordinates to discuss the dynamic effect of orography and the flow in Ekman boundary *** 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 are *** features of flow in the boundary layer,especially the effects of Ekman pumping,are discussed in *** 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 and convergence of air flow caused by friction,(2)the upslope or downslope motion of flow over the mountain slopes,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.