“6.12”华南局地暴雨中β和γ结构的双多普勒雷达反演试验

STRUCTURE OF MESO-βAND-γ-SCALE ON SOUTH CHINA HEAVY RAINFALL ON JUNE 12～13, 2005 USING DUAL-DOPPLER RADAR

使用双多普勒雷达三维风场反演技术对2005年6月12～13日广东省梅州和汕头多普勒天气雷达探测到的华南局地暴雨资料进行了三维风场反演,对暴雨系统的中尺度三维动力结构进行了分析。此次暴雨主要是由中低层的中β和中γ尺度辐合线造成的,强回波带与速度辐合带有较好的对应关系。辐合线对暴雨的触发、维持、持续具有重要作用,随着辐合线的减弱消散,强回波带也逐渐减弱,地面降水也随之减弱。最后,给出了此次暴雨的三维动力结构模型。

The three-dimensional wind fields of a heavy rain from June 12to 13, 2005 in Guangdong province were retrieved and studied, using the volume scan data of the dual-Doppler radar located in Meizhou and Shantou cities. It was shown that the meso-β-scale and meso- γ-scale convergence line locating in the convective system in the low and middle layer played an important role in the heavy rainfall. The convergence line is the initiating and maintaining mechanism of the rain. The echo band corresponded with the convergence line. The three-dimensional kinematic structure model was also given.