边界层辐合线在局地强风暴临近预警中的应用  

Application of Boundary Convergence Line in Nowcasting Warning of Severe Convective Storm

作　　者：刁秀广[1] 车军辉[1] 李静[1] 朱君鉴[1] 

机构地区：[1]山东省气象台,济南250031

出　　处：《气象》2009年第2期29-33,I0003-I0007,共10页Meteorological Monthly

基　　金：山东省科技厅科技攻关项目(2007GG20008001);山东省气象局重点课题(2007sdqxz03)共同资助

摘　　要：利用济南CINRAD/SA雷达探测到的边界层辐合信息,结合地面实况和探空资料及NCEP资料,对近年发生在山东中部的典型局地强风暴的生成及对流参数进行了分析。结果表明:高时空分辨率的雷达能获得近地层辐合线信息,对流风暴强的出流和近地层环境风的辐合在一定条件下可产生窄带回波;远离风暴主体的出流边界和顺地面风移动的风速辐合线在热力条件较弱的情况下一般不会产生对流天气;出流边界的叠加或出流边界与环境风辐合线的叠加在有利的环境条件下可产生局地强风暴,单纯的近地层辐合线在有利的环境条件下可产生较为孤立的局地风暴,可作为强对流天气临近预警的关键参考依据;风暴初始位置、初始时间和风暴类型具有不确定性,是强对流天气临近预警的难点。By using the sounding data,surface wind vector,sounding data,NCEP data and the boundary convergence line detected by Jinan Doppler weather radar,severe convective storms happened in Shandong province during 2005-2007 were analyzed.The results show that Doppler weather radar with high spatial and time resolution can obtain the information of boundary convergence zone.Normally,the narrow band echo reflects the existence of thunderstorm outflow and surface wind-field convergence zone.The outflow boundary keeps away from storms or the convergence zone moved in the same direction because the surface wind can＇t trigger convective storm in a condition of weak thermal instability.The coalescent of two outflow boundary or the coalescent of the outflow boundary and the surface wind convergence zone can trigger local severe convective storms,whereas the single surface wind convergence zone can produce isolated convective storms.These results can afford a pivotal reference for short range forecasting and convective storm nowcasting.The difficulties in nowcasting convective storms are the incertitude of initial echo location,the formative time of initial echo and the type of convective storms.

关 键 词：边界层辐合 窄带回波 强风暴 

分 类 号：P425.54[天文地球—大气科学及气象学] P426.62