南半球冷空气活动影响北半球夏季风的对比试验

CONTRAST EXPERIMENTS ON THEEFFECT OF THE SH COLD AIR ACTIVITY ON THE SH SUMMER MONSOON

本文基于诊断分析结果,使用郭晓岚—钱永甫的p—σ坐标5层原始方程球带模式做了南半球冷空气活动影响北半球夏季风的对比试验。文章着重分析了北半球亚洲夏季风地区(特别是东亚地区)的流场、气压场、降水场以及非绝热加热场对澳大利亚地区有、无冷空气活动的不同响应。结果指出,南半球澳大利亚地区的冷空气活动能够引起东亚地区夏季风的加强和北进,但会使印度季风减弱或中断。在其影响过程中,经向风扰动呈现出由南向北的传播,其时间滞后约12天左右。

contrast experiments are performed by diagnostic analysis on the effect of the southern hemisphere cold air activity on the northernhemisphere summer monsoon in terms of Kuo-Qian p-σ incorporated coordinate five-layered primitive equation spheric band model. Emphasis is laid on analysis of the different responses of the flow, pressure and rainfall fields as well as the dibatic heating in the Asian monsoon area, especially in East Asia, to the presence and absence of the cold air activity in the Australian area .Results suggest that the Australian cold air can make the East Asian summer monsoon enhanced and move northward, but the Indian monsoon may become weakened or interrupted. In the process the meridional wind disturbance exhibits a south north pro pagation with a time lag of ten to fifteen days.