塔里木盆地西北部一次飑线过程的多普勒雷达回波分析

Analysis of Doppler Radar Echo of a Squall Line in the Northwestern Tarim Basin

利用喀什新一代多普勒天气雷达监测资料和常规天气图,结合2010年7月21日发生在塔里木盆地西北部的一次暴雨灾害,分析了飑线的演变过程,发现强回波进入雷达扫描区就已经呈现出较典型的飑线特征,回波强度能很好地反映飑线发展变化,中气旋的出现与强对流风暴有一定的关系,雨强和垂直累积液态含水量对定时、定点、定量预报暴雨有很好的参考价值,垂直风切变也能反映中小尺度系统的存在。本文重点分析出现在伽师县西克尔库勒镇上空的暴雨形成机制,从而说明了多普勒雷达产品对南疆西部强对流天气的预警、预报有很好的指示作用。

Based on CINRAD Doppler radar echo and the routine weather data,a squall line happened in the northwestern Tarim Basin on July 21st,2010 was analyzed.It was found that strong echo into the radar scanning area had presented the typical characteristics of squall line.Echo intensity reflected the development process of the squall line.The mesocyclone was associated with the intense convective storm.The rainfall intensity and vertical accumulative liquid water content was instructive to the forecast of timing,quantifying,and locating rainstorm.Vertical wind shear could also reflect the meso-microscale system.The formation mechanism of rainstorm over the Xikerkule town of the Gashi was analyzed as the focus.This study explained that the Doppler radar products showed better indicative function to early warning and forecast of strong convective weather in the west of southern Xinjiang.