沙漠与绿洲气象2025，Vol.19Issue(5)：68-77,10.DOI:10.12057/j.issn.2097-6801.2401.15004
陕北两次暴雨过程成因及极端性分析
Causes and Extremes Analysis of Two Rainstorms in Northern Shaanxi
摘要
Abstract
Using conventional observations and ERA5 reanalysis data,this study investigates two extreme rainstorm events on July 11("7·11")and August 9("8·9"),2022,under anomalously wet conditions in northern Shaanxi.Key results include:(1)The"7·11"event was driven by a low-level jet providing persistent moisture transport and a deep mesoscale vortex,resulting in widespread,prolonged rainfall.(2)The"8·9"event occurred under the subtropical high,featuring extreme convective instability(CAPE>75th percentile of historical extremes)and precipitable water(SA>3σ).A surface convergence line triggered a β-mesoscale convective complex(MCC),producing short-duration rainfall exceeding 80 mm·h-1.(3)For"7·11"event,moisture flux SA exceeded 3σ at 700/850 hPa,with multiple dynamic/thermodynamic parameters reaching record highs.关键词
陕北暴雨/极端降水/对比分析/标准化异常Key words
heavy rainstorm in northern Shaanxi/extreme rainfall/comparison analysis/standardized anomaly分类
天文与地球科学引用本文复制引用
丁李敏,陈小婷,高宇星..陕北两次暴雨过程成因及极端性分析[J].沙漠与绿洲气象,2025,19(5):68-77,10.基金项目
中国气象局秦岭和黄土高原生态环境重点开放实验室开放研究基金课题(2023-G3) （2023-G3）
