应用单多普勒雷达资料反演风场作暴雨中尺度分析

针对2002年6月23日发生在安徽西部的一次暴雨过程，以有限的探空资料作为大尺度背景场，应用合肥CINRAD-98D多普勒雷达资料，通过准四维变分分析方法进行反演，获得了不易被常规探测到的中小尺度三维风场，由此分析了引起强降水的中尺度天气系统。指出暴雨中心位于风速切变的下方，同时上空也伴随辐合中心，以及正涡度极大值。分析结果表明，变分法是一种较为准确的从雷达资料中提取三维风场的方法。利用雷达资料反映中尺度天气系统，同时又加入大尺度的背景场作为基础，两者相互弥补，能较真实地反映实际天气状况。在气象预报中有效地应用多普勒雷达资料，有助于研究更为细致的中小尺度天气系统结构，而且也可为中小尺度数值预报模式提供准确的初始场。

Meso-scale Rainstorm Analysis by Using Retrieved Wind Field from Single Doppler Radar

Studied is a rainstorm event,which occurs in the west of Anhui Province on June 23,2002.By taking the finite sonde data as large-scale background field,the 3-D small and meso-scale wind field,which is very difficult to be acquired by regular sonde data,are retrived in use of quasi-4-D variation analysis together with the aid of CINRAD-98D Doppler radar data in Heifei.Then the meso-scale weather system inducing strong precipitation is investigated.It is pointed out that the rainstorm center is under the wind shear,above which convergence center and the maximum positive vorticity exist.Results show that the variation method is a efficient way to retrieve 3-D wind field data from Doppler radar data.Using the radar data to reflect the meso-scale synopic system and taking large-scale background fields into consideration,the method embodies the practical weather very well through the mutual implementing between them.The effective appalication of Doppler radar data into weather forecast is very helpful to explore the more detailed struture of meso-scale synoptic system and provide more exact initial field for meso-scale numerical forecast model.