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气象:2009,35(1):55-64
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一次强雷暴阵风锋和下击暴流的多普勒雷达特征
(1.江苏省盐城市气象局,224005;2.上海中心气象台)
Analysis of a Strong Gust Front and Downburst with Doppler Weather Radar Data
(1.Yancheng Weather Office,Jiangsu Province 224005;2.Shanghai Meteorological Center)
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投稿时间:2008-02-04    修订日期:2008-09-23
中文摘要: 利用江苏盐城多普勒天气雷达资料结合自动气象站和常规观测资料对2007年7月25日苏北兴 化等地的一次雷雨大风过程进行了分析。结果表明:风灾是由两种不同类型的雷暴大风产生 的。一种是阵风锋, 产生于风暴前沿,影响时地面产生7~9级大风。另一种是下击暴流,产 生于多单体风暴中,其反射率因子核初始高度高于-20℃等温线高度,有中层径向辐合和反射 率因子核下降的特征。影响时风暴内部下沉气流在地面强烈辐散,产生10级以上的大风。阵 风锋上空有新生单体合并进原风暴,风暴发展加强;当下击暴流产生、风暴减弱后,阵风锋 上
Abstract:A strong rainstorm is analysis which occurred in Xinghua located the north of Ji angsu province on 25 July 2007. Results show that wind disaster originated from two kinds of rainstorm. One kind was the gust front which occurred at the front of the storm. Strong wind of grade 7-9 was attained when it happened. Another ki nd was the downburst arose in the multi cell storm. The original height of refl ectivity core was higher than -20℃ isotherm. It had the characteristics of conv ergence on the mid level and descending of reflectivity core. The strong wind ab ove grade 10 was attained, when the descending airflow diverged strongly on the ground. A new cell was combined with the former storm above the gust front, thus the storm enhanced. When the downburst happened, the storm weakened, and another new cell was combin ed with the former storm. The downburst happened continuously, and the impact of gust front persisted.
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吴芳芳,王慧,韦莹莹,王群,2009.一次强雷暴阵风锋和下击暴流的多普勒雷达特征[J].气象,35(1):55-64.
Wu Fangfang,Wang Hui,Wei Yingying,Wang Qun,2009.Analysis of a Strong Gust Front and Downburst with Doppler Weather Radar Data[J].Meteor Mon,35(1):55-64.