鄂西北夏季对流降水回波特征的研究  

INVESTIGATION ON CHARACTERISTICS OF CONVECTIVE ECHOES IN THE NORTHWESTERN AREA OF HUBEI PROVINCE IN SUMMER

作　　者：王斌[1] 周勇[2] 杨维军[1] 唐仁茂[1] 

机构地区：[1]湖北省气象科学研究所,武汉430074 [2]湖北省十堰市气象局,十堰市442000

出　　处：《应用气象学报》2001年第z1期151-157,共7页Journal of Applied Meteorological Science

基　　金：国家科技攻关课题! (96 0 2 0 0 1 0 5);湖北省科委重点课题!"混合云人工催化技术方法及鄂东防雹作业判据的研究"

摘　　要：该文通过对鄂西北 1 995～ 1 999年 6～ 9月 2 73个对流回波个例进行统计分析 ,得出 :生成对流云的主要天气背景为西风低槽过境和副高外围的影响。对流云回波出现频率 6、9月较少 ,7～ 8月较多。当地地形对对流云活动具有促进生成、约束移动、抬升加强等作用。对流云可分为单体、多单体、超级单体和混合云中对流等种类。 6、9月对流云平均的生命时间较短 ,回波强度、顶高和强回波区顶高较低。相反 ,7～ 8月对流云回波特征值较高。A statistic study of weather backgrounds, seasonal characteristics, echo patterns and eigenvalues concerning convective precipitation are calculated through analyzing 273 convective precipitation cases from June to September, 1995 through 1999 in the northwestern area of Hubei Province in summer. It is concluded that the main weather background includes the passage of a westly trough and the periphery influence of Subtropic High. The occurrence frequency of convective echoes is higher in July and August than in June and September. The terrain effect on convective cloud activity mainly includes formation promotion, movement restriction and uplift enhancement. Convective clouds can be divided into four kinds: convective cell, multiple cell, super cell and mixed cell. The lifetime of convective echo can be composed of three phases: formation and growth, developing and strengthening and weakening and fading. Convective clouds have shorter lifetime, lower echo intensity and echo peak heights and smaller strong echo extent in June and September than in July and August.

关 键 词：夏季 对流 雷达回波 

分 类 号：P481[天文地球—大气科学及气象学]