JIANG Weiwei,LI Guoping.Comprehensive Analysis of Moisture Characteristics for a Disastrous Nocturnal Rainstorm Event in the Western Sichuan Basin[J].Journal of Chengdu University of Information Technology,2025,40(03):339-345.[doi:10.16836/j.cnki.jcuit.2025.03.014]
四川盆地西部一次夜间致灾暴雨的水汽特征综合分析
- Title:
- Comprehensive Analysis of Moisture Characteristics for a Disastrous Nocturnal Rainstorm Event in the Western Sichuan Basin
- 文章编号:
- 2096-1618(2025)03-0339-07
- Keywords:
- nocturnal rainstorms; Sichuan Basin; moisture characteristics; source and contribution; Lagrangian method
- 分类号:
- P426
- 文献标志码:
- A
- 摘要:
- 为深入探究四川盆地西部夜间暴雨的水汽输送特征,利用ERA5再分析资料、四川省加密站小时降水量资料及全球同化系统资料等,基于欧拉方法和拉格朗日方法综合分析2019年8月19-20日发生在四川盆地西部的一次夜间暴雨过程的环境条件和水汽特征,重点应用拉格朗日追踪模式定量计算暴雨过程中的水汽输送来源及各源地对降水的贡献。研究表明:短波槽、高原涡及大气不稳定层结是本次暴雨产生和维持的基本环境条件。暴雨过程中,不同高度层次上水汽源地呈多源特征。对流层低层(850～700 hPa)水汽主要来自四川盆地本地及周边地区,其次是孟加拉湾,两者的水汽贡献率之和高达73%。中层(500 hPa)水汽主要来自印度半岛(贡献率为44.8%),孟加拉湾(26.3%)和南海(24.9%)的水汽输送亦有重要贡献。值得关注的是,四川盆地本地及周边地区对夜间暴雨的水汽贡献率是随着气层高度的降低而明显增大的。
- Abstract:
- To deeply explore the characteristics of water vapor transport during the nocturnal rainstorm in the west of Sichuan Basin, the environmental conditions and water vapor characteristics of nocturnal rainstorms in the west of Sichuan Basin from August 19 to 20, 2019 were comprehensively analyzed based on Euler method and Lagrange method by using ERA5 reanalysis data, hourly precipitation data of densification stations in Sichuan Province and global assimilation system data. The Lagrange tracing model(HYSPLIT)was mainly used to quantitatively calculate the water vapor transport sources during the rainstorm and the contribution of each source to precipitation. The results show that the short wave trough, plateau vortex, and atmospheric unstable stratification are the basic environmental conditions for the occurrence and maintenance of this rainstorm. In the process of rainstorms, the water and steam sources at different levels showed multi-source characteristics. The water vapor in the lower troposphere(850-700 hPa)is mainly from the Sichuan Basin and its surrounding areas, followed by the Bay of Bengal, with a total contribution rate of 73%. The water vapor in the middle layer(500 hPa)mainly comes from the Indian Peninsula(the contribution rate is 44.8%), and the water vapor transport in the Bay of Bengal(26.3%)and the South China Sea(24.9%)also has an important contribution. It is noteworthy that the water vapor contribution rate of the local and surrounding areas of the Sichuan basin to the nighttime rainstorms increases significantly with the decrease in height.
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备注/Memo
收稿日期:2024-03-01
基金项目:国家自然科学基金资助项目(42175002); 四川省中央引导地方科技发展资助项目(2024ZYD0175)
通信作者:李国平.E-mail:liguoping@cuit.edu.cn