冰雹风暴中的流场结构及大冰雹生成区  

The Air Flow and the Large-Hail Generation Area in Hailstorms

作　　者：朱君鉴[1] 郑国光[2] 王令[3] 房文[2] 刁秀广[4] 

机构地区：[1]山东省气象科学研究所,山东济南250031 [2]中国气象局,北京100081 [3]北京市气象台,北京100089 [4]山东省气象台,山东济南250031

出　　处：《南京气象学院学报》2004年第6期735-742,共8页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40275001);山东省气象局科技创新项目"山东多普勒天气雷达业务工作平台研究开发"

摘　　要：采用对风暴每6min一次CINRAD/SA的立体扫描资料,分析了新一代天气雷达探测到的几次冰雹云的空间结构。结果表明,风暴中存在中尺度气旋,中尺度气旋低层气旋性辐合、中低层纯气旋性旋转、中上层气旋性辐散、高层辐散。在中高层气旋的右后侧紧挨着有一个反中气旋伴随。中气旋与反中气旋形成了一个"8"型流场和"S"型的强回波区。在中层到中高层,"S"型强回波区有利于形成"穴道",而在"S"的两个拐弯处的内侧,水平速度更小,更易形成"穴道",成为大冰雹生成区。Based on a series of WSR-98D(CINRAD/SA) volume scan data every 6min,the structure of 3 hailstorms is analysed.Each storm had a mesocyclone,wherein the flow converged cyclonically at the low level,rotated cyclonically at the middle-low level,diverged cyclonically at the middle-up level,and diverged at the up level.On the right back of the mesocyclone there was an accompanying anticyclone at the middle-up level.Cyclone and anticyclone forms a '8' pattern flow and a 'S' shape intense refractivity area.The 'S' area at the middle-up level helps form a 'cave channel'.In the two turnings of the 'S',the horizontal velocity is weaker,the 'cave channel' forms more frequent and is the large-hail spawn region.

关 键 词：中尺度气旋 强回波 冰雹生成 

分 类 号：P426.64[天文地球—大气科学及气象学]