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气象:2009,35(7):23-32
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张家界多个例降雹过程对比分析
(1.兰州大学大气科学系, 730000;2.湖南省张家界市气象局;3.湖南省气象台;4.湖南省常德市气象局)
Comparative Analysis of Several Hailing Cases in Zhangjiajie
(1.College of Atmospheric Science, Lanzhou University, Lanzhou 730000;2.Zhangjiajie Meteorological Office,Hunan Province;3.Hunan Provincial Meteorological Observatory;4.Changde Meteorological Office)
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投稿时间:2008-04-10    修订日期:2009-01-19
中文摘要: 利用NCEP再分析资料、常规资料及ECMWF数值预报产品等资料,从降雹特征、大气环流形势 特征、物理量条件、风暴源地、雷达回波特征等方面入手,对2005年张家界5次降雹过程进 行深入对比分析。结果表明:冰雹区具有点、线、面三种分布特征,不同冰雹灾害过程造成 的直接经济损失程度与受灾面积及受灾人口在数量上存在显著的正相关关系;5次降雹过程 分别发生在高空槽型和东北低涡型两种典型冰雹环流背景形势下,其中高空槽型影响范围更 大,破坏更强;较好的水汽条件、对流不稳定条件和较强的垂直风切变促使冰雹等强对流天 气过程发生发展;5次风暴均初生于地形高度高梯度区上空,聚集在大山周围及山地偏南区 的迎风坡,说明热力及地形对风暴的生成及能否发展成为冰雹云有着极为重要的作用;降雹 过程均具有典型的冰雹云雷达回波特点和形态,在风暴体VIL密度超过4g?m-3的4次 降雹过程中均产生直径约2cm的大冰雹,说明VIL密度对大冰雹具有强的指示作用。
Abstract:Based on the characteristics of hailing, characteristics of atmospheric circulat ion, physical quantity conditions, storm source and characteristics of radar ech o, five hailing processes in Zhangjiajie in 2005 were analyzed by using the NCE P reanalysis data, conventional data and ECMWF forecast products. The result sho ws that the hailing areas are distributed respectively in spots, lines and plane s, and the direct economical losses caused by different types of hailing processes have a significant positive correlation with the disaster stricken ar ea and disaster stricken population amount. The five hailing processes occur un der the typical upper air trough and northeast vortex hailing circulation backgr ound respectively, whereas those hails occurred in the upper air trough circu lation influence a larger area with greater destruction. Favorable hydrometeor c onditions, convective instability conditions and strong vertical wind shear prom ote the generation and development of strong convection synoptic processes. All the five storms occur in the location with a large gradient of topography, an d concentrate around mountains and the windward slopes in south of the mountain ous area, which means that the thermodynamic effect and landform play a critical role in the generation of storms and the development into hail cloud. All the h ailing processes have the characteristics of typical hail cloud radar echo, and the large hails with a diameter of about 2cm are generated during the four hai ling processes with the storm body VIL density of more than 4g?m-3, which means that VIL density has a significant indicating function for large hails.
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基金项目:湖南省气象局重点项目高分辨率数值预报释用技术研究、科技部气象 公益性行业专项(GYHY(QX)2007 6 12)共同资助。
引用文本:
刘兵,戴泽军,胡振菊,李玉梅,黄俊,黄萍,2009.张家界多个例降雹过程对比分析[J].气象,35(7):23-32.
Liu Bing,Dai Zejun,Hu Zhenju,Li Yumei,Huang Jun,Huang Ping,2009.Comparative Analysis of Several Hailing Cases in Zhangjiajie[J].Meteor Mon,35(7):23-32.