多普勒天气雷达径向速度图上的雹云特征  

Hailstorms Characteristics in Doppler Radar Radial Velocity Fields

作　　者：王令[1] 郑国光[2] 康玉霞[1] 房文[2] 卞素芬[1] 许焕斌 

机构地区：[1]北京市气象台,北京100089 [2]中国气象科学研究院,北京100081 [3]北京应用气象研究所,北京100029

出　　处：《应用气象学报》2006年第3期281-287,i0001,共8页Journal of Applied Meteorological Science

基　　金：国家自然科学基金项目(40275001);北京市科技计划项目"奥运会气象保障科学技术试验与研究"03课题;河北省科学基金项目(401485)共同资助

摘　　要：不同的强对流天气造成的灾害和社会影响差别很大。通过对北京地区2001年和2002年出现的32次降雹时伴随出现的天气现象分类和对雹云多普勒天气雷达径向速度场图像特征的分析统计,得出“大风区”、“中气旋”是经常出现降雹的多普勒径向速度图像特征。“大风区”常伴随出现强风冰雹,而“中气旋”则常伴随出现暴雨冰雹,这对于判别冰雹云产生什么样的天气现象是有指示意义的。In severe hailstorms, hailstones always falls accompanied with some other weather disasters such as thunder, strong wind and rainstorm. Generally speaking, different kinds of strong convective weather bring damage and even social influences to different extents. Beijing is one of the areas that hail occurs frequently and suffers from previous damage every year. With the widely deployment of Doppler radars all over the country in recent years, more studies on the local convective weather systems including hails are gradually put into practice. It is well-known that the hail formation relates closely to various atmospheric physical conditions. The formation of those large hailstones to a great extent relies on the changes of wind structure which always has a storm scale. Among the 32 hailstorms occurred in 2001 and 2002 of Beijing, four kinds of weather phenomena are categorized according to their surface observation including hailfall together with wind and rain, hailfall with wind only, hailfall with rain only, and the others. The radar image characteristics and the Doppler radar radial velocity fields from these 32 hailstorms observed in Beijing are discussed in detail. Statistical analysis shows that the characteristics of ＂gale region＂ and ＂mesocyclone＂ can always be identified from the radar echo images. The ＂gale region＂ is an area which displays a maximum Doppler radar radial velocity along the wind direction in radar PPI（V） echoes. The radial velocity is more than 20 m/s. On the front edge of the wind, the velocity grads is so great that the wind direction changes abruptly. The ＂gale region＂ is a downwards airflow related to cold air, often stimulates squall line and fails into the category of [3 mesoscale synoptic system. Observed from radar PPI（V） echoes, the ＂mesocyclone＂ is a cyclonic convergence or rotating area in the Doppler radar radial velocity fields. It is easy to be identified from continuous animated radar echoes. Different air flows converge together and form such

关 键 词：冰雹云 多普勒天气雷达 径向速度特征 临近预报 

分 类 号：P426.55[天文地球—大气科学及气象学]