多普勒雷达对一次阵风锋的三维结构研究  

Analysis of a Gust Front 3-D Structure by Using Doppler Radar Data

作　　者：王振国 卓鸿[2] 李春虎[3] 刘爱梅[2] 杨芙蓉[2] 

机构地区：[1]甘肃省甘南州气象局,甘肃合作747000 [2]济南市气象局,山东济南250001 [3]山东省气象局,山东济南250001

出　　处：《干旱气象》2007年第1期48-52,87,共6页Journal of Arid Meteorology

基　　金：山东省气象局重点科研项目(2005sdqxz17)资助

摘　　要：通过对济南地区一次春季阵风锋的多普勒雷达资料分析,反演出典型的密度流外流边界(阵风锋)的特征,在雷达回波图上表现为一条狭窄的弧状强回波带,强回波带的后方再发展出宽大较弱的回波区。体扫的各仰角速度场显示出阵风锋合理的空间结构;在雷达回波上阵风锋的长度表现为低仰角长,高仰角短,而距离表现为低仰角远,高仰角近。速度垂直剖面上存在典型的中层径向辐合MARC,高度大约在2.5-7 km之间,反映出强对流存在明显的后方中层入流。随着仰角的增大,可以分析出阵风锋是近地面现象。A spring gust front occurred on April 17, 2003 over Ji＇ nan was analyzed by using Doppler radar data. A typical density current outflow boundary （ gust front） characteristic was retrieved, which presented a strong narrow bow echo belt before a wide weak echo region on Doppler radar echo images. Different elevation velocity fields showed a reasonable spatial structure of the gust front . The characteristic of the gust front on Doppler Radar echo images presented the length was long （short） at low（high） elevation and the distance was far（near） at low（high） elevation. A typical midaltitude radial convergence （MARC） at the height of 2.5 -7 km on velocity vertical profile indicated an evident rear middle - level inflow. A phenomenon that the gust front was near the ground was found with radar elevation increase.

关 键 词：春季阵风锋 多普勒雷达 空间结构 中层径向辐合MARC 

分 类 号：TN958[电子电信—信号与信息处理]