05.7.23河北暴雨中尺度分析  

A Mesoscale Analysis of a Heavy Rainfall Event in Hebei on 23 July 2005

作　　者：侯瑞钦 景华 张迎新 张文君[2] 

机构地区：[1]河北省气象台,石家庄050021 [2]中国科学院大气物理研究所

出　　处：《气象》2006年第7期88-94,i0002,共8页Meteorological Monthly

摘　　要：利用常规观测资料和卫星、自动站、加密雨量站、多普勒雷达等资料,对2005年7月22—24日河北中南部大暴雨过程进行天气动力学和中尺度分析,结果表明这次暴雨是在有利的大尺度环流下产生的;副热带高压及热带系统造成的低层水汽堆积及高层的强辐散为强对流发生提供了热力和动力条件;整个过程中主要有三个强对流云团活动,地面对应有3个中-β尺度雨团产生,雨团一般出现在中尺度辐合线或中尺度气旋性环流偏向暖湿气流一侧;强雷达回波和正负速度对、逆风区等特征对强降水具有指示意义。Based on the routine observational data as well as data of satellite, automatic weather stations, densified rainfall stations and Doppler radar in Hebei Province, the dynamical and mesoscale signature for the heavy rainfall event occurred on July 22-24, 2005 is analyzed. The results show that the heavy rainfall occurrs in the favorable environmental conditions. The main reasons to the severe convective weather are the water vapor accumulation on lower levels and strong divergence on upper levels caused by subtropical High and tropical depression which provided thermal and dynamical conditions. There are three severe convective cloud clusters and three meso-β rain clusters during the heavy rainfall, and the rain clusters appeared on the mesoscale convergence line or the warm and moisture side of the mesoscale low. Strong radar echoes and positive-negative velocity and head wind area are indicative to the heavy rainfall event.

关 键 词：大暴雨 中尺度分析 雨团 多普勒雷达产品 

分 类 号：P458.121.1[天文地球—大气科学及气象学] TN959.4[电子电信—信号与信息处理]