摘要
利用常规观测资料、ERA-5再分析资料等,诊断分析一次典型的突发性暴雨过程,揭示了黔西南州夏季突发性暴雨的有利形势、水汽条件、热力动力条件及对流系统结构特征。通过分析了黔西南州2015年5月20日凌晨的特大暴雨天气过程表明此次暴雨过程副热带高压稳定,同时大槽东移引导冷空气南下,冷暖气流在黔西南州上空交汇,在与中低层低涡切变共同影响下造成了此次大暴雨过程。在发生暴雨前,低层辐合高层辐散的形势,促进强降水的发生;在发生暴雨时,暖湿气流为降水提供了有利条件;暖湿不稳定的层结,使强降水持续发生。
Based on the conventional observation data and ERA-5 reanalysis data,a typical sudden rainstorm process was diagnosed and analyzed to reveal the favorable situation,water vapor conditions,thermodynamic and dynamic conditions and structural characteristics of convective system of sudden rainstorm in Qianxinan Prefecture in summer.The analysis of the torrential rain in early morning of May 20,2015 in Qianxinan Prefecture shows that the subtropical high was stable during the torrential rain,while the big trough moved eastward to guide the cold air to the south,and the cold and warm airflow intersected over the prefecture,which resulted in the torrential rain process with the combined influence of the vortex shear in the middle and low levels.Before the rainstorm,the situation of low level convergence and high level divergence promotes the occurrence of heavy precipitation.When the rainstorm occurs,the warm and wet airflow provides favorable conditions for precipitation.The unstable stratification of warm and wet makes the heavy precipitation continue to occur.
作者
李阳
顾天红
田人妃
孟庆怡
范倩
唐浩鹏
LI Yang(Qianxinan Meteorological Bureau Xingyi,Guizhou 562400)
出处
《农业灾害研究》
2021年第4期108-109,共2页
Journal of Agricultural Catastrophology
关键词
黔西南州
特大暴雨
天气学
成因分析
Qianxinan prefecture
Heavy rainstorm
Synoptic meteordogy
Cause analysis
作者简介
李阳(1993-),男,贵州兴义人,助理工程师,主要研究方向:短期天气预报。
