一次台风暴雨的多普勒速度图像分析

DOPPLER VELOCITY ANALYSIS OF A TYPHOON HEAVY RAINFALL

关键词:  台风  暴雨  多普勒速度图像分析

Key words:  Typhoon  Heavy rain  Image analysis of velocity by Doppler radar

摘要:

利用国产第一部714SD多普勒天气雷达加密观测资料对发生在厦门及附近县、市的一次台风暴雨过程的多普勒速度图像进行分析。结果表明,这次暴雨过程由两场暴雨组成,低层切变线侵入高能区触发第一场暴雨,此时对流层低层存在三支气流,而第二场暴雨则主要由切变线上生成的边界层气旋和低空西南急流的脉动造成。虽然造成两场暴雨的中尺度系统以及流场特征有很大差异,但两场暴雨的发生有其内在联系。

Abstract:

This research is focused on Doppler velocity ayalysis of a heavy rain process,which was closely observed by Xiamen 714SD Doppler radar——the first one made in China.The process consisted of two heavy rainfall.The first one was caused by a low level shear line that invaded high energy area.When the first heavy rainfall occurred there were three air streams at the low level.The second one was produced by a cyclonic vortex,which developed along the shear line,and the fluctuation of low level SW jet stream in PBL.Although the two heavy rainfalls differed in mesoscale systems and flow features which accompanied them,there may be some relationship between them.