台风外围暴雨成因及其增幅的一种动力学机理

ON DYNAMIC MECHANISM FOR TYPHOON RAINSTORM CAUSE AND ENHANCEMENT

通过对９２１６号台风外围暴雨的诊断分析，发现暴雨是由低层低压气旋流场系统、与高层高压反气旋流场系统以及深厚的饱和湿度层所组成的一种高层抽吸作用所形成。暴雨的增幅原因，是通过台风和东风波系统与西风带的低涡低槽系统合并加深后，导致暴雨区上空暖平流因子增强和高层抽吸作用增强所形成。最后对预报和研究这类暴雨提出了几点看法。

Diagnosis is performed of the rainstorm from Typhcon 16 of 1992,indicating that the rainfall is generated through high-level pump ing operated with a low-level cyclon ic flowfield,a high-level anticyclonic flowfield, and a deep vapor-saturated layer available,and that the raingush enhancement is attributed to the typhcon moving into the easterly wave system or a vortex or trough in westerlies,thus leading to intensified warTn advection over the rainband and increased pumping at high levels. Eventually, some remarks are given as to the research and prediction in the scope of typhoon rainstorm.