2020年8月中旬成都强降水过程的天气学分析  

Synoptic Analysis of the Process of Heavy Precipitation in Chengdu in Mid-August 2020

作　　者：杨若欧 张永莉 杨康权 YANG Ruoou;ZHANG Yongli;YANG kangquan(College of Atmospheric Sciences,Chengdu University of Information Technology,Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225,China;Sichuan Meteorological Observatory/Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China)

机构地区：[1]成都信息工程大学大气科学学院高原大气与环境四川省重点实验室,四川成都610225 [2]四川省气象台高原与盆地暴雨旱涝灾害四川省重点实验室,四川成都610072

出　　处：《成都信息工程大学学报》2022年第3期325-332,共8页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(42075019);高原与盆地暴雨旱涝灾害四川省重点实验室开放研究基金资助项目(SZKT2016003)。

摘　　要：为探究成都强降水发生发展的机制,提高气象防灾减灾能力,利用常规观测数据、美国国家环境预报中心和欧洲数据中心再分析数据,研究成都2020年8月10-20日强降水过程的降水实况、环流特征、物理量场及云图特征。结果表明:(1)强降水过程分两次。第一次降水过程主要诱因是副热带高压西进,高原低值系统减弱且东移,低空急流加强。第二次降水过程主要诱因是西南涡的发展,北方冷空气侵袭。通过比较,两次降水过程的形成均受西南涡的影响,但第一次降水过程西南涡中心途经成都,故影响范围更广,降水强度更大。(2)通过分析物理量水汽通量、稳定指数、垂直速度等,发现它们共同作用于降水过程且与降水活动具有良好的一致性。(3)卫星云图表明云团的发展分裂和水汽含量对降水过程起着至关重要的作用。此次天气学分析为今后同类天气系统的强降水分析提供参考。To investigate the causes of the development of heavy precipitation in Chengdu and to improve meteorological disaster prevention and mitigation,this study uses conventional observation data,US National Centers for Environmental Prediction and European Data Center reanalysis data to investigate the precipitation reality,circulation characteristics and physical quantity fields of the heavy precipitation process in Chengdu from August 10-20,2020.The results show that:(1) the heavy precipitation process is divided into two times.The main causes of the first precipitation process are the westward movement of subtropical high pressure;the weakening and eastward movement of the plateau low value system;and the strengthening of the low-level rapid.The main causes of the second precipitation process are the development of the southwest vortex and the invasion of cold air from the north.By comparison,the formation of the two precipitation processes was affected by the Southwest Vortex,but the center of the Southwest Vortex in the first precipitation process passed through Chengdu.Thus,the affected area was wider and the precipitation intensity was greater.(2) The analysis of physical quantities such as water vapor flux,stability index and pseudo-equivalent potential temperature reveals that they act together in the precipitation process and are in good agreement with the precipitation activity.(3)Satellite cloud maps show that cloud development and water vapor content play a crucial role in the precipitation process.This weather analysis will provide a reference for future intense precipitation phenomena of similar weather systems.

关 键 词：强降水 西南涡 物理量 水汽输送 

分 类 号：P458.121.1[天文地球—大气科学及气象学]