灾害学2024，Vol.39Issue(2)：99-105,7.DOI:10.3969/j.issn.1000-811X.2024.02.016
陕西三次强致灾性初夏区域性暴雨动力诊断对比分析
Comparative Analysis on Dynamic Diagnosis of Three Strong Disaster Causing Regional Rainstorms in Early Summer in Shaanxi
摘要
Abstract
Three regional rainstorm processes in early summer in Shaanxi with a comprehensive assessment in-tensity index of more than 300 are compared and analyzed in terms of water vapor and dynamic vertical structure by using conventional observation data and 0.25° × 0.25 °hourly ERA5 reanalysis data.The results show that:①Be-fore the occurrence of the strong disastrous regional rainstorm in early summer,the middle and upper levels of wa-ter vapor transport came from the southwest airflow、and the lower levels came from the easterly airflow.The devel-opment of water vapor convergence in the lower levels was strengthened,and the dynamic forcing was mainly mani-fested in the positive vorticity area below 700 hPa and extended to the upper levels,corresponding to the strong negative vorticity center near 200 hPa;②After the beginning of the rainstorm,the water vapor transport at the low-er level to the east would change during the precipitation process.The water vapor convergence at the lower level continued to strengthen,prompting the water vapor transport to the upper level.The divergence field had a structure of strong convergence at the lower level and divergence at the upper level.However、Guanzhong had a special structure of double convergence-divergence,and the positive vorticity area continued to extend to the upper level,and the dynamic uplift promoted the upward movement to extend to 400 hPa and above;③The dynamic forcing of rainstorm in early summer in southern Shaanxi was weaker than that in Guanzhong,but the water vapor transport and content were better than those in Guanzhong,with higher precipitation efficiency and larger total precipitation.关键词
初夏/区域性暴雨/水汽辐合/涡度/散度/垂直运动Key words
early summer/regional rainstorm/water vapor convergence/vorticity/divergence/vertical movement分类
天文与地球科学引用本文复制引用
高菊霞,李文耀,武麦凤,马晓华..陕西三次强致灾性初夏区域性暴雨动力诊断对比分析[J].灾害学,2024,39(2):99-105,7.基金项目
中国气象局创新发展专项子项目"陕西初夏4次区域性暴雨过程形成机理对比分析"(CXFZ2021Z34-84) （CXFZ2021Z34-84）
