湖北梅雨期暴雨的中尺度系统及其模拟分析  

Mesoscale System and Numerical Simulation Analysis of Heavy Rain in Hubei Province during Meiyu

作　　者：徐双柱[1] 邹立维[2] 刘火胜 毛以伟[4] 

机构地区：[1]中国气象局武汉暴雨研究所,湖北武汉430074 [2]南京大学大气科学系,江苏南京210093 [3]湖北荆州市气象局,湖北荆州434100 [4]武汉中心气象台,湖北武汉430074

出　　处：《高原气象》2008年第3期567-575,共9页Plateau Meteorology

基　　金：中国气象局项目“风云气象卫星遥感开发与应用示范”;武汉暴雨研究所开放基金课题(IHR2006G04)共同资助

摘　　要：利用武汉多普勒雷达和武汉暴雨所AREM模式资料,分析了湖北省2005年梅雨期的一次暴雨过程。结果表明,暴雨发生在条状回波带变宽的时候,位于2 km上空切变线附近的中尺度气旋中,表现为强对流单体回波;强降水发生时,对流系统中有两个强上升运动中心,分别位于300 hPa和600hPa附近,低层辐合、高层辐散的分布对上升运动的维持是有利的;环境风场并不能很好地控制中尺度对流系统的移动方向,中尺度对流系统向低层涡度增加的地方移动;暴雨形成过程可概括为低层切变线东移诱发出地面低压,产生垂直上升运动迅速增加,配合丰沛的水汽输送和高不稳定能量释放。Using the Doppler radar in Wuhan and the AREM mode data, a rainstorm in Hubei province during Meiyu in 2005 is analyzed. It is found out that the heavy rain would be happened when strip- echo turn broaden, and the rainstorm locate in meso-cyclone above 2 km which performance a single of severe convection. There are two strong rising centers in the convection system which located near 300 hPa and 600 hPa, respectively, when the severe precipitation happened. It is beneficial that low layer match the loose and single mold of high layer to distribute to maintenance rising movements. Environment wind canr t control mesoscale convection system for ambulation direction and mesoscale convection system - increasing to the place movement of low layer vorticity. The formation process of rainstorm can be summarized as follows： Low layer slice line towards to the east which caused low pressure on ground, make the movement of perpendicular rising quickly increase and match with transport of abundant vapor and high and unsteady energy to release.

关 键 词：梅雨暴雨中尺度系统 多普勒雷达 AREM模式 

分 类 号：P458.121.1[天文地球—大气科学及气象学]