【摘要】 本文利用1960—1969年10年平均高空风资料,对青藏高原及其邻近地区1、4、7、10月的平均流场、涡度场、散度场及垂直速度场进行了计算。文中还讨论了高原边界层内摩擦作用对这些物理量分布的影响;发现垂直速度与降水量分布配合得很好。作者初步认为青藏高原的动力作用对西北干旱气候的形成有重要影响。更多还原

【Abstract】 In this paper, using monthly mean upper wind data ( 1961-1970 ) , we calculate the mean fields of stream,vorticity,divergence and vertical velocity over Qinghai-Xizang and its surrouudings during January, April, July and October.It is found that in the inside of the boundary layer over the north part of the plateau and to the north of its, anticyclonic vorticity, divergence and downdraft are caused and maintained because of the dynamical friction effect over the lateral boundary of the plateau and the surface of the principal part of the plateau and dynamical rounding flow effect to the E of Tian-Shan mountain and the NE of the plateau.We think that the dynamical effect of Qinghai-Xizang plateau has important influence for the formation of dry climate over the NW of China.更多还原