1983年梅雨期季风流管合成分析

COMPOSITE ANALYSIS OF MONSOON STREAM TUBE DURING SUMMER 1983

中文摘要:

      本文采用合成方法对1983年初夏季风流管进行分析。指出在洪涝灾害严重的长江中下游地区,存在一个较稳定的季风流管,它的变化不仅和江淮地区雨带位置有好的对应关系,而且对降水的强度也有直接的影响。分类合成结果表明,上升支强的流管对应强降水,上升支弱的流管对应弱降水。热源计算表明,驱动季风流管运动的主要因子,是低层潜热和高层感热,季风流管的上升支为热源,下沉支为热汇,构成一个简单的热机,对季风流管的形成有着重要意义。

英文摘要:

      Using composite method, the monsoon stream tube(MST)of early summer in 1983 has been analysed. It is indicated that over flood basins in the middle and lower Changjiang River and Huaihe River, a quite stable MST exists. It's variation is closely related not only to the position of the rainfall belt over Changjiang and Huaihe River, but also to the rainfall intensity. The classified composite analysis and the weak MST shows that the strong MST corresponds to the heavy rain corresponds to the weak rain.The calculation of heat sources indicates that the major motive forces which drive the MST are latent heat in the lower layar and sensible heat in the upper layer. The heat source is found at the ascending branch of the MST and the heat sink at the descending branch, consisting of a simple heat engine. It is significant to the formation of MST.