广东揭阳地区一次局地强降水的多普勒雷达分析  

Doppler Radar Analysis of a Local Heavy Precipitation in Jieyang Area of Guangdong

作　　者：柯文华 寿绍文[2] 管习权 杨新 

机构地区：[1]广东省揭阳市气象局,广东揭阳522000 [2]南京信息工程大学江苏省气象灾害重点实验室大气科学学院,江苏南京210044

出　　处：《安徽农业科学》2010年第18期9618-9619,9677,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(40875025;40875030;40775033);上海市自然科学基金项目(08ZR1422900)

摘　　要：利用多普勒天气雷达资料分析了2008年7月31日揭阳市区的突发特大暴雨过程的中尺度特征。结果表明,雷达回波从生成到迅速加强成大于50 dBz的强回波只不过二十几分钟的时间,风暴中心一直在揭阳市附近南落、北上来回摆动,东移分量极小,强降水回波停滞不动。在此强降水过程中,有利于强降水回波生成发展的径向速度特征类型:第1类逆风区、第2类逆风区、中尺度辐合型、气旋式辐合等相互交替出现,从而造成了此次破记录的强降水过程;分析表明,发展旺盛的逆风区以及在逆风区垂直方向上存在入流和出流气流的辐合对降水的贡献显著。By using Doppler weather radar data,the mesoscale features of a sudden extremely-heavy rainstorm process in Jieyang City on July 31st of 2008 were analyzed.The results showed that there was a small south wind jet streak near Jieyang on 700 hPa supplying adequate atmospheric water vapor,and the wind shear line and convergence zone proving the dynamic conditions,which showed the close relationships between the wind shear and convergence centre and the heavy rain centre.The mesoscale south-north orientated surface convergence line maintained longer time and to cause the stagnant of the precipitation echo band in the original location.The reversed wind zone lasted for a longer time heralded the occurrence of the extreme torrential rain.

关 键 词：局部特大暴雨 中尺度特征 多普勒天气雷达 

分 类 号：S422[农业科学—植物保护]