沙漠与绿洲气象2025，Vol.19Issue(3)：113-121,9.DOI:10.12057/j.issn.1002-0799.2312.08001
陕西中部一次致灾暖区大暴雨的中尺度特征及成因
Convective Characteristics and Mechanism of a Local Heavy Rainfall in Central Shaanxi
摘要
Abstract
Using FY-4A satellite and radar data,regional automatic station data,European Center ERA-5 reanalysis data,the structure characteristics of the mesoscale convective system at the edge of the subtropical high in the northeast of Guanzhong,Shaanxi Province on July 14-15,2022 and the causes of the local special heavy rainstorm were studied.The results indicated that the extreme precipitation was caused by the mesoscale convective systems of α,β and γ.The northeast Guanzhong is located in the warm sector of the Subtropical High.The shear of the 700 hPa low-vortex was maintained in the central and northern parts of Shaanxi,with unstable environmental conditions of high temperature and high humidity near the surface.The strengthening of low-level easterly wind brought about continuous water vapor convergence,the maintenance and enhancement of medium intensity vertical wind shear caused the growth of helicity,and the maintenance of strong vortex movement were important mechanisms for the consolidation and enhancement of rainstorm.The backward propagation of mesoscale convective cells was caused by the cyclonic convergence and maintenance of radar wind fields,which resulting in the"train effect"of the backward propagation of inclined deep moist convective cells with low centroids and high cloud tops.The continuous and efficient precipitation was the direct cause of the heavy precipitation in Pucheng area in the northeastern Guanzhong,Shaanxi Province.关键词
暴雨云团/垂直风切变/热力垂直螺旋度/后向传播Key words
rainstorm cloud cluster/vertical wind shear/thermal vertical helicity/backward propagation分类
天文与地球科学引用本文复制引用
屈丽玮,刘胜男,刘嘉慧敏,胡启元,肖贻青,郭大梅,高星星..陕西中部一次致灾暖区大暴雨的中尺度特征及成因[J].沙漠与绿洲气象,2025,19(3):113-121,9.基金项目
秦岭和黄土高原生态环境气象重点实验室面上课题(2023G-1 （）
2023G-4) （）
陕西省自然科学基础研究计划项目(2024-JC-YBMS-217) （2024-JC-YBMS-217）
气象能力提升联合研究专项(24NLTSZ003) （24NLTSZ003）
