基于热源作用的青藏高原东坡一次夜间暴雨的诊断分析  

Diagnosis and Analysis of a Heavy Rain at Night on the East Slope of the Tibetan Plateau Based on the Effect of Heat Source

作　　者：王政明 李国平[1] WANG Zhengming;LI Guoping(School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Dazhou Meteorological Bureau,Dazhou 635000,China)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]达州气象局,四川达州635000

出　　处：《沙漠与绿洲气象》2023年第1期96-103,共8页Desert and Oasis Meteorology

基　　金：国家自然科学基金(91937301,42175002,42075013);国家重点研发计划项目(2018YFC1507200)。

摘　　要：利用ERA5再分析资料、CMORPH融合降水资料和山地通量观测资料对2020年6月26日发生在四川冕宁一次夜间致灾暴雨进行综合诊断分析。结果表明:本次夜间暴雨发生前,白天地面热源存在明显的正异常变化,地面热源的正异常区与降水有很好的对应关系。同时大气热源(视热源和视水汽汇)与暴雨的关系密切且相互影响,降水释放凝结潜热,加热大气,使得视热源也随之增加。在暴雨发展强盛阶段,视水汽汇的垂直输送项达到最大,而视水汽汇的局地变化项能很好指示整个暴雨过程中区域水汽的净输送状况。By using ERA5 reanalysis data,CMORPH fusion precipitation data,and flux observation data in Chongqing mountains,we performed a comprehensive diagnosis and analysis of a disastercausing nocturnal rainstorm that occurred in Mianning,Sichuan on June 26th,2020.The results show that before heavy rain at night,the surface heat source has obvious positive anomalous changes during the day,and the positive anomaly area of the surface heat source has a good corresponding relationship with the precipitation.At the same time,atmospheric heat sources(apparent heat sources and apparent water vapor sinks)have a close relationship and mutual influence with heavy rain each other.Precipitation releases latent heat of condensation,heating the atmosphere,and increasing apparent heat sources.In the strong rainstorm stage,the vertical transportation of the water vapor sink reaches the maximum;the local change of the water vapor sink is a good indication of the net transportation status of the regional water vapor during the entire rainstorm process.

关 键 词：夜间暴雨 冕宁 地面热源 视热源 视水汽汇 

分 类 号：P458.1[天文地球—大气科学及气象学]