Mechanism Analysis of ＂7 · 21＂ Extremely Heavy Rainstorm Process in 2012 in Beijing

• 作者: Mao Weiping Wang Tingfang Yan Yan Zhang Youshu
• 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 机理分析 北京时间 特大暴雨 降水特征 水汽输送 上升运动 物理量场
• 年，卷（期）: 2015,（1）
• 页码范围: 4-8
• 页数: 5页
• 分类号: P458.121.1

摘要

Extremely heavy rainstorm occurred in Beijing on July 21,2012,which was the most serious since 1961.Based on analyzing the precipitation characteristics,formation mechanism of the rainstorm process was analyzed.Results showed that when the precipitation process occurred,it was stable east-high and west-low situation at 500 hPa,and there was a steady stream of water vapor transportation at middle and low layers and strong vertical ascending motion at 700 hPa.The distribution of physical quantity field(relative humidity,vorticity and divergence)showed that they were all benefited to the formation of rainstorm.Then,falling zone of rainstorm and the movement of rain belt,generation,development and weakening of precipitation were analyzed.Finally,according to circulation situation and the distribution of physical quantity at each layer,vertical distribution of physical quantity and distribution of water vapor and jet stream, "7·21" rainstorm model was summarized.