2019年9号台风“利奇马”倒槽暴雨过程初步诊断分析  

Preliminary Diagnostic Analysis of Rainstorm Process in the Inverted Trough of No.9 Typhoon“Lekima”in 2019

作　　者：丁晓敏 邵禹晨 程昕 颜雅琼 唐舟 秦亚兰 DING Xiao-min(Suqian Meteorological Bureau,Suqian,Jiangsu 223800)

机构地区：[1]宿迁市气象局,江苏宿迁223800 [2]海宁市气象局,浙江海宁314400

出　　处：《农业灾害研究》2020年第9期78-82,85,共6页Journal of Agricultural Catastrophology

基　　金：江苏省气象局预报员专项“江苏汛期极端降水和气温的关系研究”(JSYBY201907);宿迁市科技支撑计划项目(S201607)共同资助。

摘　　要：利用地面常规观测资料和FNL再分析资料(分辨率0.25°×0.25°),从环流背景、水汽输送、动力条件、热力条件及冷空气侵入作用等方面,对宿迁市2019年8月10—11日大范围大暴雨过程进行诊断分析。结果表明:这次大暴雨过程是台风倒槽和冷空气结合导致的;“利奇马”台风西南侧西南季风暖湿气流,以及副高南侧东南风气流双水汽通道为此次台风倒槽暴雨过程输送了充沛的水汽和不稳定能量;这次暴雨形成的重要机制是冷空气的侵入使台风外围环流斜压性增强,垂直风切变增强,导致对流不稳定能量及潜热能释放。Based on the conventional ground observation data and FNL reanalysis data(resolution: 0.25°×0.25°), the large-scale rainstorm process in Suqian City during August 10-11, 2019 was diagnosed and analyzed in terms of circulation background, water vapor transport, dynamic and thermal conditions, and cold air intrusion. The results show that the heavy rainstorm was caused by the combination of typhoon trough and cold air. The southwest monsoon warm and wet air flow on the southwest side of Typhoon "Lekima" and the double water vapor channel of southeast wind flow on the south side of the subtropical high transported abundant water vapor and unstable energy for the rainstorm process of the typhoon inverted trough. The important mechanism of the rainstorm is that the intrusion of cold air enhances the baroclinic and vertical wind shear of the peripheral circulation, which leads to the release of convective instability energy and latent heat energy.

关 键 词：台风倒槽 冷空气 暴雨 诊断分析 湿位涡 

分 类 号：P458.121.1[天文地球—大气科学及气象学]