上海“8.5”特大暴雨的成因和特点  

Mechanism and Characteristics of the Severe Heavy Rainfall in Shanghai on 5 August 2001

作　　者：邵玲玲[1] 黄炎[1] 

机构地区：[1]上海中心气象台,200030

出　　处：《气象》2002年第8期47-50,共4页Meteorological Monthly

摘　　要：利用WSR 88D多普勒雷达资料 ,通过分析 2 0 0 1年 8月 5日到 8月 6日产生于上海地区的特大暴雨过程的雷达回波特征 ,研究探讨这次过程的降水成因和降水特点。发现副热带高压边缘偏南气流的风速辐合、螺旋雨带中强回波短带的合并加强、风的垂直切变产生的辐合以及热带系统的高效率降水作用是这次暴雨过程的降水成因和降水特点。并提出了预报这类暴雨系统需要注意的要点 :强降水回波的发生和发展加强往往和风场中的局地强辐合区相联系 ,利用多普勒雷达连续演变的风场资料 ,可及时了解辐合区的形成和演变过程 。Based on WSR 88D radar data, the radar echo′s characteristics of the torrential rain in Shanghai on the night of August 5th 2001 are analyzed to find out its precipitation mechanism and characteristic.It is found that a south wind velocity convergence on the side of subtropical high,the echo′s consolidation in the spiral rain band,convergence caused by wind′s perpendicular shear and high precipitation rate of tropical system are the precipitation mechanism and characteristic of the rain event.Some key points are presented about forecasting this kind of heavy rain events:heavy precipitation echo′s appearance and development are always related with local strong convergence in wind field,local convergence′s appearance and evolution can be found from the continuous change of Doppler radar wind data,thus,the forecast of heavy precipitation′s probability can be made.

关 键 词：上海 回波特征 特大暴雨 成因 降水 垂直切变 风场 风速辐合 

分 类 号：P458.121.1[天文地球—大气科学及气象学]