大气科学2026，Vol.50Issue(1)：66-80,15.DOI:10.3878/j.issn.1006-9895.2505.24059
广西台风"海葵"残涡极端暴雨关键热动力过程
Key Thermodynamic Processes of an Extreme Rainstorm Caused by the Residual Vortex of Typhoon Haikui(2311)in Guangxi
摘要
Abstract
Affected by the residual vortex of Typhoon Haikui(2311),an extreme rainstorm occurred along the southeast coast of Guangxi from September 10 to 11,2023.The event featured intense rainfall,overlapping precipitation zones,and distinct nighttime rainfall characteristics,with many stations recording precipitation amounts that broke historical records.Based on multisource observations and ERA5 reanalysis data,the causes of the extreme rainstorm and the possible mechanism underlying the maintenance of the residual vortex were analyzed.The findings are as follows.Under the influence of a weakening continental high and a stable western Pacific subtropical high,the"Haikui"residual vortex,positioned between the two systems,was weakly guided by the steering flow and remained stationary over Guangxi.Working in tandem with a strong southwest monsoon flow,this condition led to the extreme rainstorm.The area near the rainstorm center exhibited a strong potential for heavy precipitation,and the precipitable water content was abnormally high before the peak rainfall.The boundary layer jet on the southeast side of the residual vortex served as the key influencing system for the extreme rainstorm,playing a cross-scale pivotal role in linking the residual vortex with local severe precipitation.Its nocturnal development was associated with an increase in local kinetic energy driven by the work done by the meridional pressure gradient force in the southeast quadrant of the residual vortex.The evolution of the boundary layer jet facilitated the formation of strong vertical helicity through low-level convergence uplift combined with the positive vorticity circulation of the residual vortex.Meanwhile,the frontogenesis forcing of convergence and deformation at low levels provided dynamic conditions favorable for heavy precipitation.Additionally,the rainstorm center maintained high temperature and humidity at lower levels and a deeper wet layer.The presence of a deep warm-advection heating layer and latent heating in the mid-troposphere created favorable thermal conditions for sustaining the residual vortex circulation.At night,perturbation downslope winds along the eastern slope of the Yunnan-Guizhou Plateau and perturbation onshore winds from the Beibu Gulf converged toward the center of the residual vortex.This interaction enhanced wind field convergence and provided dynamic conditions for the development and maintenance of cyclonic vorticity within the residual vortex.关键词
"海葵"残涡极端暴雨/边界层急流/锋生强迫/下坡扰动风/向岸扰动风Key words
Residual vortex extreme rainstorm of typhoon Haikui/Boundary layer jet/Frontogenesis force/Perturbation downslope wind/Perturbation onshore wind分类
天文与地球科学引用本文复制引用
覃皓,农孟松,黄明策,杨明鑫,翟舒楠,刘晓梅,邱滋..广西台风"海葵"残涡极端暴雨关键热动力过程[J].大气科学,2026,50(1):66-80,15.基金项目
中国气象局复盘总结专项FPZJ2024-100,广西重点研发计划项目桂科AB25069126、桂科AB22080101,中国气象局创新发展专项CXFZ2025J013,广西气象科研计划项目桂气科2024M02 Funded by Review and Summary Special Project of China Meteorological Administration(Grant FPZJ2024-100),Key Development Program of Guangxi(Grants GuiKe AB25069126,GuiKe AB22080101),Innovative Development Project of China Meteorological Administration(Grant CXFZ2025J013),Meteorological Scientific Research Program Project of Guangxi(Grant GuiQiKe2024M02) （Grant FPZJ2024-100）
