“7·23”大暴雨动力机理的双多普勒雷达反演

Three-Dimensional Kinematic Structure of "7·23" Heavy Rain Revealed by Dual-Doppler Radar

摘要:

使用地基双多普勒雷达MUSCAT三维风场反演技术,利用宜昌和荆州双多普勒雷达同步体积扫描资料,对2002年7月22-23日湖北省境内的一次混合型大暴雨进行了三维风场的反演。分析表明,中低层的中尺度气旋和气旋性切变线是触发和维持此次大暴雨的重要动力因素;低层辐合,高层辐散的动力配置也有利于强降水系统的发生和发展。

关键词:暴雨;三维风场;双多普勒天气雷达;风场反演

Abstract:

This paper retrieves and studies the three-dimensional kinematic structure and dynamic mechanism of the heavy rain on 22nd-23rd July 2002 in Hubei Province,using the volume scan data of the dual-Doppler radar located in Yichang and Jingzhou cities in the middle reaches of the Yangtze River.It is shown that the shear line and the meso-cyclone at the low and middle levels are the dynamic factors which triggered and maintained the heavy rain;and the dynamic configuration of the divergence of air flow at the upper level over the convergence of air flow at the low level also availed the formation and development of the heavy rain system.

Key words:heavy rain;three-dimensional wind fields;dual-Doppler weather radar;wind field retrieval