南亚夏季风系统双周振荡机制的探讨

本文用ECMWF以及OLR资料,分析印度和东亚两个季风子系统之间的相互作用,提出一个关于南亚季风系统双周振荡的机制。机制的主要内容是:(1)南亚季风系统的双周振荡以澳大利亚高压为启动系统,通过两条途径影响北半球;(2)印度季风槽的振荡通过自西向东传播影响ITCZ,使两者活动存在一定的位相差;(3)季风向大陆的水汽输送制约着东亚副热带地区环流系统的变化,影响到南亚高压的东西振荡,最终通过东亚季风环流圈影响澳大利亚高压。

A RESEARCH ON MECHANISM ABOUT THE QAUSI-BEWEEKLY OSCILLATIONS OF SOUTH ASIA MONSOON SYSTEM

In this paper, we put forward a mechanism about the Qausi Beweekly oscillations of South Asian monsoon system. Its main opinions are as follows :(1) In southern hemisphere, the oscillations of Australia high not only affect South China sea monsoon trough, but also affect the actions of Mascarene high by propagating westward. So it plays an important role in the oscillations of South Asia monsoon system.(2) In northern hemisphere, the oscillations of Indian monsoon trough propagate eastward to result in the South China sea monsoon trough, and sequentially, to cause the active break circle of the rain belt in Chinse continent, the oscillations of South Asia high and West Pacific high.