热带气象学报2024，Vol.40Issue(5)：834-844,11.DOI:10.16032/j.issn.1004-4965.2024.072
台风"暹芭"残余环流引发中国东部暴雨的影响原因及数值模拟研究
Causes and Numerical Simulation of Heavy Rainfall in Eastern China Triggered by Residual Circulation of Typhoon"Chaba"
摘要
Abstract
Typhoon Chaba was not only the first typhoon to make landfall in China in 2022,but also the most potent to hit western Guangdong since Typhoon Mujigae in 2015.Its residual circulation,after landfall and subsequent weakening,continued to move northward,penetrate deep into the Chinese mainland and merge with the mid-latitude westerly trough.This resulted in a widespread,intense,and persistent rainstorm in eastern China.To investigate the factors influencing this unusual weather event,the present study designed six sets of experiments using the regional mesoscale forecast system CMA-MESO version 5.1 to simulate and diagnose the northward progression of Chaba's residual circulation.The results showed that the two anticyclonic circulations of South Asian high pressure and subtropical high pressure on the east and west sides of Chaba were conducive to the northward movement of the low-pressure circulation.Under the influence of the broad plains and hills in eastern China,the southwestern airflow ahead of the trough consistently directed it towards the northeast.After Chaba entered the Bohai Sea,it was affected by the dry,cold air following the trough.This led to the invasion of cold air at the base of the circulation,enhancing baroclinicity,significantly lifting the warm,humid airflow,and further intensifying convective instability.At the same time,there were deep,warm,and humid southwestern airflow from the South China Sea and continuous water vapor transport from the periphery of Typhoon Aere.Under the combined influence of topography,dynamic and thermal forces,and water vapor conditions,the residual circulation of Chaba triggered the heavy rainstorm in eastern China.关键词
台风"暹芭"/地形/西风槽/水汽/暴雨Key words
Typhoon Chaba/topography/westerly trough/water vapor/rainstorm分类
天文与地球科学引用本文复制引用
马怡轩,于翡,徐国强..台风"暹芭"残余环流引发中国东部暴雨的影响原因及数值模拟研究[J].热带气象学报,2024,40(5):834-844,11.基金项目
国家自然科学基金项目(U2142213、42175167、41975057) （U2142213、42175167、41975057）
中国气象局能力提升联合研究专项项目(22NLTSZ006) （22NLTSZ006）
中国气象局青年创新团队(CMA2023QN06)共同资助 （CMA2023QN06）
