沙漠与绿洲气象2024，Vol.18Issue(4)：59-67,9.DOI:10.12057/j.issn.1002-0799.2024.04.009
2021年10月山西一次罕见持续性强降水过程物理机制分析
Analysis of the Physical Mechanism of a Persistent Heavy Rain Event in Shanxi Province in October 2021
摘要
Abstract
The persistent heavy rainstorm that occurred in Shanxi province from October 2th to 7th,2021 was analyzed based on meteorological observation data,NCEP/NCAR 1°×1° reanalysis data,and GDAS data.The findings reveal that the cold air behind the stable Ural low trough and mid-latitude short wave trough moved southward and interacted with the warm moist air outside the subtropical high in southwestern China.Simultaneously,a strong upward movement coupled with high and low-level jets maintained the stability of the low-level shear line and surface convergence line,facilitating continuous transport of low-level water vapor which converged to provide favorable conditions for the occurrence and development of persistent heavy rainfall.The heavy precipitation process can be divided into two stages:convective precipitation and stable precipitation.Although there were significant differences in terms of water vapor source,path,and height between the two stages,water vapor transport from southern Shanxi province dominated as a major contributor throughout both stages.Prior to precipitation onset,symmetric instability was observed in the upper troposphere along with a notable increase in precipitable water content.During the convective precipitation stage,frequent intrusion of dry air established rapid convective instability while cooperation between convergence areas of middle-to-lower tropospheric water vapor and strong updrafts resulted in intense convective weather over Shanxi province.Additionally,local extreme heavy precipitation was further enhanced by blocking effects as well as terrain-induced uplift and contraction.关键词
阶段性降水/环流形势/水汽输送/动力抬升Key words
periodic precipitation/circulation situation/water vapor transport/dynamic uplift分类
天文与地球科学引用本文复制引用
乔钰,赵桂香,王妍..2021年10月山西一次罕见持续性强降水过程物理机制分析[J].沙漠与绿洲气象,2024,18(4):59-67,9.基金项目
国家自然科学基金面上项目(41475050) （41475050）
山西省气象局面上项目(SXKMSTQ20226306) （SXKMSTQ20226306）
