登陆台风后部局域强降水的个例分析

本文以2000年第10号台风“碧丽斯”为例,得出特殊流场条件下登陆台风后部局域性强降雨产生的原因.它是发生在低层流场中变形场的辐合渐近线的一端附近,由于较强的偏北气流对暖湿的西南气流起到触发抬升作用,使原本水汽充沛、层结不稳定的气层对流发展,形成中尺度强对流云团,从而产生强降水.由于满足这种流场条件的区域很小,暴雨落点附近气流本身不强,因此暴雨范围不大,降雨强度也不太强,但由于流场维持时间较长,降雨历时也较长.

A Case Study on Severe Local Heavy Rain over the Rearward of a Landed Typhoon

This paper takes the Typhoon Bilis (No 200010) as a case After analysing the rain pattern, the synoptic evolvement, the humid and dynamic condition of the heavy rain, a concept model is developed to explain the causation of the heavy rain over the rearward of a landed typhoon The heavy rain was triggered by a special flow pattern over the rearward of the typhoon At the lower level there was a deformation field The heavy rain occurred at the southeast corner of the deformation field, where the northern flow played as the lifting force for the warm humid southwest flow It caused the development of a MCC, which resulted in the heavy rain The rainfall was not strong,but lasted relatively longer with stable favourable flow field