滇西北高原一次局地暴雨的雷达产品分析  

Analysis of the Doppler Radar Product of a Local Heavy Rain in Northwest Yunnan Plateau

作　　者：吴红秀 和卫东 焦泽红 吉平 李淑华 

机构地区：[1]云南省丽江市气象局,云南丽江674100

出　　处：《干旱气象》2012年第4期645-649,共5页Journal of Arid Meteorology

基　　金：中国气象局气象关键技术集成与应用项目(CAMGJ2012M40)资助

摘　　要：利用新一代Doppler雷达产品,对2009年6月28日20时至29日05时华坪局地暴雨过程进行分析。结果表明:本次暴雨强降雨前,近地面东南风维持1 h以上,增加了山前局地近地面温湿条件,并在华坪西北高东南低(迎风坡)的地形作用下,形成山前近地面局地辐合和强迫抬升。山顶附近边界层的偏西风为近地面空气强迫抬升后在边界层的后卷辐散提供了有利条件,是这次暴雨落区形成的一个主要原因。强度场上,2个中尺度回波块在南移的过程中不断集结加强,VIL值在强降雨时段表现为单峰型,暴雨落区中小尺度回波系统的滚动更迭,回波中-γ尺度逆风区辐合中心的作用,是暴雨落区形成的重要因素。A new generation of Doppler weather radar products are used to analyze the local torrential rain process in Huaping of Yunnan Province on June 29,2009.Results showed that before the heavy rainfall,the south-east wind lasted more than an hour near the ground,which improved the temperature and humidity conditions near the ground of the piedmont,and under the effect of the local topography with northwest high and southeast low（the leeward side）,a convergent zone and the topographic forcing uplift formed.Then,westerly winds in boundary layer near the top of the mountain provided beneficial factor for divergence in boundary layer,and it was one of the main reasons for this rainfall weather process.Analysis also showed that two mesoscale echos in the process of moving southward gathered and strengthened,and VIL value during the heavy rainfall period presented the single peak type,and the scroll of meso-scale and micro-scale system and the effect of meso-γ scale adverse wind area convergence zone core were the key factors resulting in this local torrential rain.

关 键 词：雷达探测产品 局地暴雨 逆风区 

分 类 号：P412.25[天文地球—大气科学及气象学]