气象与环境学报2025，Vol.41Issue(4)：1-9,9.DOI:10.3969/j.issn.1673-503X.2025.04.001
葫芦岛"8·20"特大暴雨过程成因及地形作用探究
Causes of the"8·20"extraordinary rainstorm in Huludao and exploration of topographic effects
摘要
Abstract
This study investigates the causes of the extreme rainstorm in Huludao,Liaoning Province during 19-20 August 2024 and the role of terrain,utilizing dense precipitation observations and ERA5 reanalysis data.Results show that the"east-high-west-low"circulation pattern formed by the Northeast Cold Vortex and the western Pacif-ic subtropical high facilitated moisture transport via southerly flows along the subtropical high's western flank.The convergence between cold air from the vortex and warm-moist air from the subtropical high promoted Frontogene-sis over western Liaoning.Terrain-front interactions intensified precipitation,as terrain-blocked flows in the west-ern/northern frontal zone enhanced vertical motion.This uplift further amplified Frontogenesis through its effect on Tilted Items in the frontogenetic function,constituting a key dynamic mechanism.During peak rainfall,maximum precipitation occurred in a horn-shaped mountainous area where east/southeast flow over terrain converged with northeastward ascending flows,triggering mesoscale convective systems.The southward flow over slopes generated localized convergence through flow separation-reunion mechanisms,providing additional dynamic forcing.Pro-longed frontal zone stagnation caused by orographically-induced ascent contributed to the event's exceptional dura-tion.关键词
地形/爬流/锋生/倾斜项/降水Key words
Terrain/Flow over/Frontogenesis/Tilted items/Precipitation分类
天文与地球科学引用本文复制引用
LIU Chenghan,JIAO Haoran,ZHANG Aizhong,YAN Qi,LIU Shuo,DU Jiayi,SUN Yibo..葫芦岛"8·20"特大暴雨过程成因及地形作用探究[J].气象与环境学报,2025,41(4):1-9,9.基金项目
中国气象局水文气象重点开放实验室开放研究课题(24SWQXZ019)、辽宁省科技计划联合计划(2024-MSLH-243)、中国气象局复盘总结专项(FPZJ2024-027)、辽宁省气象局科研项目(202302)、中国气象局沈阳大气环境研究所联合开放基金课题(2024SYIAEKFZD03)和中国气象局创新发展专项(CXFZ2025J021)共同资助. （24SWQXZ019）
