一次中尺度对流风暴成因及CINRAD回波特征分析  

Cause Analysis of a Mesoscale Covective Storm with CINRAD Echoes

作　　者：廖义樟 

机构地区：[1]福建省龙岩市气象台雷达站,龙岩364000

出　　处：《气象科技》2007年第B12期70-73,90,共5页Meteorological Science and Technology

摘　　要：用常规天气图、云图和CINRAD资料,分析2005年3月22日影响华南地区一次中尺度对流风暴过程。揭示中尺度对流风暴的环流背景条件及其成因:500 hPa槽前西南急流和850 hPa低涡切变东移南压及低空西南急流为对流风暴生成发展提供了有利条件;边界层华南西部低涡切变系统和地面中气旋及冷空气南下影响的共同作用是此次对流风暴的触发机制。该风暴的发生发展过程是在中等偏强的垂直风切变条件下,有利于发展成组织性完好的对流风暴。CINRAD回波结构及特征有:此次中尺度强对流风暴反射率因子表征为飑线回波带,强回波区呈弓状,其后侧有弱回波通道,预示有灾害性大风;弓状强回波头部及其带上出现了中气旋;径向速度图有逆风区及风暴相对径向速度图上有辐合区出现,在弓状回波头部有气旋性辐合等特征。分析结果有助于对流风暴的探测和预警预报服务工作。A mesoscale convective storm occurred on 22 March 2005 in South China is analyzed by means of the conventional meteorological data, satellite pictures, and CINRAD radar data, and the circulation conditions and formation causes of the storm are discussed. The storm occurred under the condition ot slightly stronger- mannormal vertical wind shear, which was favorable to the development of the storm into a well - organized convective storm. The echo structure and characteristics of the storm are also analyzed. The findings can be used as reference in forecasting and detecting convective storm

关 键 词：中尺度对流风暴 触发机制 飑线 弓状回波 逆风区 

分 类 号：P481[天文地球—大气科学及气象学]