| 湘东北一次大暴雨“列车效应”特征分析和预警服务 |
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| 引用本文： | 陈伟,唐明晖,张劲强,胡燕,陈静静.湘东北一次大暴雨“列车效应”特征分析和预警服务[J].广东气象,2014,36(4):38-43. |
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| 作者姓名： | 陈伟 唐明晖 张劲强 胡燕 陈静静 |
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| 作者单位： | 1. 郴州市气象局,湖南郴州423000;湖南省气象台,湖南长沙410007
2. 湖南省气象台,湖南长沙,410007 |
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| 基金项目： | 中国气象局气象关键技术集成与应用项目,短时强降水预报关键技术及业务应用 |
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| 摘 要： | 2014年5月9日晚湘东北出现一次大暴雨天气过程。利用常规观测资料、中小尺度自动雨量站资料、多普勒雷达产品对此次大暴雨的＂列车效应＂雷达回波特征及其成因进行分析,并对这次过程的短临时预警服务进行了探讨。结果表明：＂列车效应＂回波带主要由积状云为主的混合型回波组成,对流强降水明显;低质心结构的回波特征有利于短时暴雨的发生;径向速度图上的＂牛眼＂特征表明有强盛的西南急流存在,＂列车效应＂发生在急流轴的左侧;逆风区的出现和长时间维持为＂列车效应＂提供了动力条件;925 h Pa湘西南-湘东北的切变线和地面低压倒槽暖区内出现的中尺度辐合线位置重合,配合低空西南急流的增强是形成＂列车效应＂的主要原因;多普勒雷达特征分析为短临预警服务提供了准确的判别依据。
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| 关 键 词： | 天气学 列车效应 西南急流 逆风区 暴雨 短临预警 湘东北 |
Analysis and Nowcasting Service of a Rainstorm with "Train Effect" Characteristics in Northeast of Hunan Province |
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| CHEN Wei,TANG Min-ghui,ZHANG Jin-qiang,HU Yan,CHEN Jing-jing.Analysis and Nowcasting Service of a Rainstorm with "Train Effect" Characteristics in Northeast of Hunan Province[J].Journal of Guangdong Meteorology,2014,36(4):38-43. |
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| Authors: | CHEN Wei TANG Min-ghui ZHANG Jin-qiang HU Yan CHEN Jing-jing |
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| Institution: | CHEN Wei, TANG Min-ghui, ZHANG Jin-qiang, HU Yan , CHEN Jing-jing (1. Chenzhou Meteorological Observatory, Chenzhou 423000; 2. Hunan Meteorological Observatory, Changsha 410007) |
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| Abstract: | Using conventional meteorological observational data,mesoscale automatic weather station（ AWS） data and Doppler radar data,the characteristics of Doppler radar echo and the possible causes of ＂train effect＂ in a rainstorm event that occurred in northeast Hunan Province on May 9,2014 were analyzed.Nowcasting service for the process was also discussed. The results are shown as follows. The ＂ train effect＂ echo belt was mainly made up of mixed echo of cumuliform cloud that produced convective rainfall. The echo characteristics of low center of mass were in favor of the rainstorm. The radial speed map with a ＂ bull eye＂ structure showed that there was a low-level southwest jet and the ＂ train effect＂ occurred on the left side of the axis of the low-level jet. The appearance and long maintenance of a converse wind region provide dynamic conditions for the rainstorm. On 925 h Pa,a meso-scale convergence line in the warm sector of a surface inverted trough coincided with a southwest-northeast shear line in province. The strengthening of the low-level southwest jet was the main cause for the formation of ＂ train effect＂. Analysis of the characteristics of the Doppler radar data provides scientific basis for the nowcasting service. |
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| Keywords: | train effect southwesterly jet converse wind region rainstorm nowcasting |
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