On the Revival Mechanism of Typhoon Doksuri(2023)Remnants after Its Landfall  

作　　者：Chunyi XIANG Lin DONG Yu LAN Hui WANG Runling YU Xiaoyong ZHUGE Da LIU Qian WANG 

机构地区：[1]National Meteorological Centre,China Meteorological Administration,Beijing,100081,China [2]Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing,100081,China [3]Shanghai Typhoon Institute,China Meteorological Administration,Shanghai,200030,China [4]Nanjing Joint Institute for Atmosphere Sciences,China Meteorological Administration,Nanjing,210004,China

出　　处：《Journal of Meteorological Research》2024年第6期1032-1046,共15页气象学报(英文版)

基　　金：Supported by the National Key Research and Development Program of China(2022YFC3004200 and 2022YFC3003901).

摘　　要：After landfall,tropical cyclone(TC)remnants may maintain or even rejuvenate and incur catastrophic disasters.What leads to the revival of TC remnants over land remains elusive.In this study,the revival mechanism of Typhoon Doksuri(2023)remnants is extensively explored.Doksuri brought severe damage to the Chinese mainland after its landfall.The remnants vortex of Doksuri sustained an inland trajectory for 3 days and underwent a total maintenance of 60 h,with a revival of 18 h.Based on multi-source observations and ERA5 reanalysis data,by calculation of moist potential vorticity and analysis of slantwise vorticity development(SVD),this study unveils that while maintaining a significant warm-core structure over the course of maintenance and revival,the Doksuri remnants transported sufficient moisture in the mid–lower troposphere,which intensified the north–south temperature and humidity gradients,causing tilting of the isentropic surfaces remarkably.According to the SVD theory,the tilting gave rise to vorticity development and forced upward air motion on the northern side of the remnant vortex.Moreover,numerical sensitivity experiments based on the WRF model reveal that the topography of Taihang Mountains and the diabatic heating associated with surface and convective latent heat fluxes also played important roles in the revival of the Doksuri remnants.The dynamic and thermodynamic mechanisms derived by this study will help improve understanding and prediction of the disasters induced by TC remnants.

关 键 词：tropical cyclone(TC)remnants LANDFALL Typhoon Doksuri(2023) VORTEX revival mechanism 

分 类 号：P444[天文地球—大气科学及气象学]