大气科学2025，Vol.49Issue(3)：609-628,20.DOI:10.3878/j.issn.1006-9895.2503.24089
江西南昌"3.31"极端大风成因分析
Analysis of the Causes of the Extreme Wind Disaster in Nanchang,Jiangxi Province,on March 31,2024
摘要
Abstract
An extreme wind disaster occurred in Nanchang,Jiangxi Province,in the early morning of March 31,2024,which caused the fall of three residents from a high-rise building.The fine structure of the severe storm near the accident building was investigated,primarily based on SA dual-polarization Doppler weather radar observations from Nanchang and intensive surface observations.The results revealed that a bookend vortex was embedded in the northern end of a bow echo of a quasi-linear convective system around the time of the accident,with its horizontal scale and vertical vorticity comparable with those of a strong mesocyclone.Tornado vortex signatures(TVS)with tornado debris signatures(TDS)on a smaller scale were identified within the bookend vortex,which passed over the accident building.The radial velocity difference of TVS exceeded 40 m s-1.Damage surveys conducted along the tornado path identified by TVS and TDS revealed multiple tornadic damages,including strong cyclonic rotational winds,localized convergent rotational winds,debarked trees,and completely collapsed stone bridges.This indicated that an EF2 tornado occurred very close to the accident building,which was most likely responsible for the fatal fall.Notably,the tornado-related vortices comprise a bookend vortex and several leading-edge misocyclones embedded within it,which emerged and intensified almost simultaneously during the wind disaster.The observational study on the formation mechanisms of tornado-related vortices indicated that they resulted from the tilting of the horizontal vorticity,which is associated with the strong low-level vertical shear of the elevated rear-inflow jet and baroclinic vorticity related to the gust front.关键词
龙卷/弓形回波/书挡涡旋/龙卷涡旋特征(TVS)/龙卷残片特征(TDS)/灾害调查Key words
Tornado/Bow echo/Bookend vortex/TVS(Tornado Vortex Signature)/TDS(Tornado Vortex Signature)/Damage survey分类
天文与地球科学引用本文复制引用
李淑璠,王秀明,刘屹靖,李海俊,樊李苗,俞小鼎,汤欢..江西南昌"3.31"极端大风成因分析[J].大气科学,2025,49(3):609-628,20.基金项目
国家自然科学基金项目42375018,41875058,国家重点研发计划课题2022YFC3004104,中国气象局重点创新团队CMA2022ZD07 National Natural Science Foundation of China(Grant 42375018,41875058),the National Key Research and Development Program of China(Grant 2022YFC3004104),the Key Innovation Team of China Meteorological Administration(Grant CMA2022ZD07) （Grant 42375018,41875058）
