| 粤西沿海“4.20”特大暴雨特征分析 |
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| 引用本文： | 冯小芳,徐峰.粤西沿海“4.20”特大暴雨特征分析[J].广东海洋大学学报,2014(3):93-98. |
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| 作者姓名： | 冯小芳 徐峰 |
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| 作者单位： | 广东海洋大学海洋与气象学院,广东湛江524088 |
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| 基金项目： | 2012年度地方高校国家级大学生创新创业训练计划项目（201210566062）,广东省教育厅学科建设专项资金科技创新项目（B12363）. |
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| 摘 要： | 根据气象常规观测资料、湛江新一代天气雷达资料、CFL-08风廓线雷达资料及卫星云图,分析2012年4月20日粤西沿海特大暴雨的天气环流形势、能量场、对流不稳定度、水汽输送和辐合辐散等环境特征及物理量场特征。结果表明:这次暴雨过程粤西地区共经历两次强降水过程,分别是受飑线系统、以及高空槽和低空切变影响;西南低空急流的出现有利于粤西暴雨的形成、维持和发展;暴雨过程粤西上空垂直累积液水含量达25~30g/m2;暴雨期间风向随高度明显逆转,有冷平流输送;约2.0 km高度以下低空急流的下传和增强与暴雨的产生有密切关系;短时间内多普勒天气雷达的速度回波低层辐合区域远远大于辐散区域是可能产生强降水的标志。
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| 关 键 词： | 粤西沿海 特大暴雨 低空切变 辐合辐散 |
Analysis on Characteristics on ＂4.20＂ Heavy Rainstorm in Western Guangdong Coast |
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| FENG Xiao-fang,XU Feng.Analysis on Characteristics on ＂4.20＂ Heavy Rainstorm in Western Guangdong Coast[J].Journal of Zhanjiang Ocean University,2014(3):93-98. |
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| Authors: | FENG Xiao-fang XU Feng |
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| Institution: | (Ocean and meteorological College of Guangdong Ocean University, Zhanjiang 524088, China) |
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| Abstract: | By using the meteorological observation data, Zhanjiang Doppler radar echoes, Zhanjiang CFL-08 wind profiler and satellite images of western Guangdong coastal rainstorm, analysing energy field, convective instability, water vapor transportation and convergence of environment characteristics, the formation and impact factors of the rainstorm in April 20, 2012 of western Guangdong are revealed. The result shows that： this area has experienced two times of heavy rainfall during the process, resulting from the mesoscale system mainly controlled by the squall line, the upper trough line and shear line, respectively; the formation and maintenance of rainstorm benefits from the southwest low-level jet; the vertical accumulation of water in the western Guangdong is about 25-30 g/m^2 during the rainfall; wind turns widdershins with altitude, sending cold flow; low level jet under 2.0 km descent and enhancement is closely related to the generation of precipitation; it is a sign of possible rainstorm in which the Doppler radar velocity echoes of convergence region in lower layer is larger than the divergence region in a short time. |
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| Keywords: | Guangdong Coastal Heavy Rainstorm Shear Line Convergence ＆ Divergence |
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