Diagnostic Analysis of a Rainstorm Process in Chongqing

• 作者: Hu Rong Li Yaodong Shi Xiaokang
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 暴雨过程 重庆 诊断 NCEP再分析资料 西南低涡 上升运动 降水落区 暖湿气流
• 年，卷（期）: 2014,（1）
• 页码范围: 28-35
• 页数: 8页
• 分类号: P458.121.1

摘要

[Objective]The research aimed to analyze a rainstorm process in Chongqing.[Method] Based on precipitation product datasets and NCEP reanalysis data,synoptic situation and diagnostic analysis of a heavy rain process during 11-12 May,2012 in Chongqing were made,and the diagnostic analysis included dynamic and vapor conditions,instability index,vapor helicity and vapor divergence flux.[Result]The east-south moving short wave trough and east-north moving southwest vortex were the main synoptic systems causing the heavy rain;the positive vorticity advection before trough and after ridge helped the ascending motion from surface;the southwest stream at 700 hPa provided vapor and energy,promoting and maintaining the intense development of convection;the higher vapor helicity and lower vapor divergence flux were well corresponding with higher precipitation area,and had well temporal correlation,which was significant for forecast of precipitation area and its development;the ascended warm wet stream on the lower air came across the cold air on the upper air,triggering the heavy rain;the K index and A index were significant for the heavy rain forecasting.[Conclusion]The research could provide some references for research and forecast of future rainstorm process in Sichuan and Chongqing.