长江中上游一次极端暴雨天气过程成因分析  

Analysis on the cause of an extreme rainstorm in the middle and upper reaches of the Yangtze River

作　　者：陆相霖 LU Xianglin(Yichang Yiling District Meteorological Bureau,Yiling 443100,China)

机构地区：[1]宜昌市夷陵区气象局,湖北夷陵443100

出　　处：《安徽农学通报》2024年第22期101-104,共4页Anhui Agricultural Science Bulletin

摘　　要：利用常规气象观测资料、气象信息综合分析处理系统Micaps 4资料、自动站实时数据和多普勒雷达资料等,通过诊断分析方法,对2020年6月27日一次极端暴雨天气过程成因诊断分析。结果表明,在有利的环流背景下,高空槽东移、中低层切变、西南低空急流及梅雨锋的共同作用形成了此次暴雨天气过程。暴雨发生在低层辐合、高层辐散的上升运动区,副高稳定维持在20°N附近,受副高阻挡,中纬度低槽和中低层切变线稳定维持,低空急流强劲,地面上形成梅雨锋,高空急流入口区右侧的强辐散使低层低值系统强烈发展,加强了上升运动,同时水汽条件充足,使得研究区出现暴雨天气。为提高研究区天气预报精准度提供参考。Conventional meteorological observation data,Micaps 4 data,automatic station real-time data and Doppler radar data were used through diagnostic analysis methods,a cause analysis of an extreme rainstorm weather process on June 27,2020 was carried out.The results showed that under the favorable circulation background,the rainstorm weather process was caused by the combined action of the eastward movement of the high trough,the shear of the mid-low levels,the southwest low-level jet and the Meiyu front.The rainstorm occurred in the ascending movement area of low-level convergence and high-level divergence.The subtropical high was stable around 20°N,and the midlatitude low trough and the mid-low level shear line were stable and maintained due to the subtropical high blocking.The low-level jet was strong,and the Meiyu front was formed on the ground.The strong divergence on the right side of the upper level jet inlet area made the low-level low value system develop strongly,and strengthened the ascending movement.At the same time,the water vapor conditions were sufficient,making the study area appear rainstorm weather.To provide references for improving the accuracy of weather forecasting in the research area.

关 键 词：暴雨 环流形势 回波特征 天气预报 

分 类 号：S165[农业科学—农业气象学]