大气科学2025，Vol.49Issue(2)：353-368,16.DOI:10.3878/j.issn.1006-9895.2311.23092
高影响西南涡发展指数探索
Research on the Development Index of High Impact Southwest China Vortex
摘要
Abstract
Based on the ERA5(0.25°×0.25°)hourly reanalysis data,this study analyzes two high-impact Southwest China Vortex(SWV)processes with long-distance movement and stagnation over a local area.It is suggested that two physical variables,namely,the low-to mid-level convergence and pseudoequivalent potential temperature,are the key factors influencing the development and evolution of the vortex.According to the findings,a vortex development index is defined in this study.By comparing the vortex development index with the evolution of the SWV and precipitation,the following results were obtained.(1)The vortex development index can indicate the development and evolution trend of the intensity and position of the vortex,whether it is a long-distance moving or a local stationary SWV process.In addition,the index can reveal multicore vortices during intense vortex events and the moving mechanism of the SWV.(2)The vortex development index not only indicates the intensity and coverage area of vortex precipitation but also reflects the coexistence phenomenon between SWV and precipitation,thereby providing a possible explanation for the"rain-induced vortex"and"vortex-induced rain"phenomena.The results of this study suggest the positive significance of the vortex development index in forecasting the precipitation distribution and the position of the precipitation center of high-impact SWV heavy rainfall events.关键词
西南涡/发展演变/低涡发展指数/暴雨Key words
Southwest China Vortex(SWV)/Development and evolution mechanism/Vortex development index/Heavy rainfall分类
大气科学引用本文复制引用
卢萍..高影响西南涡发展指数探索[J].大气科学,2025,49(2):353-368,16.基金项目
国家自然科学气象联合基金项目U2242202,国家重点研发计划项目2022YFC3003902,四川省自然科学基金项目2022NSFSC0021 Funded by Joint Meteorological Fund of the National Natural Science Foundation of China(Grant U2242202),National Key Research and Development Program of China(Grant 2022YFC3003902),Natural Science Foundation of Sichuan Province(Grant 2022NSFSC0021). （Grant U2242202）
