2021年“7·20”河南特大暴雨水汽输送特征  

Water vapor transport characteristics of July 20,2021 rainstorm in Henan Province

作　　者：闫玮 欧阳智 王泳棋 黄建平[1,2] 赵庆云 YAN Wei;OUYANG Zhi;WANG Yong-qi;HUANG Jian-ping;ZHAO Qing-yun(College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;Collaborative Innovation Center for Western Ecological Safety,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学大气科学学院,兰州730000 [2]兰州大学西部生态安全省部共建协同创新中心,兰州730000

出　　处：《兰州大学学报（自然科学版）》2024年第2期143-150,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(91937302);中国科学院战略性先导科技专项(XDA2006010301)。

摘　　要：2021年7月20日河南郑州出现极端暴雨,降水量达624.1 mm,最大小时降水量201.9 mm,突破中国内地小时降水量历史极值.利用常规气象观测资料、再分析资料以及基于拉格朗日方法的水汽轨迹追踪模式,分析暴雨的水汽输送情况.结果表明,大尺度环流异常形成的持续偏东风和南风的水汽输送,导致河南大范围持续暴雨;持续存在的低涡是降水长时间持续的原因,同时高、低空环流系统配置,为暴雨发展提供有利条件;20日郑州南边界水汽输送的急剧增加,是造成极端暴雨的关键;暴雨水汽输送通道主要有700 hPa高度上来自南海的水汽贡献(61.0%)和太平洋通道(33.0%);850 hPa,来自太平洋的水汽贡献达82.3%,来自南海水汽贡献为17.7%.Extreme rainstorm occurred over Zhengzhou,Henan Province on July 20,2021,with a total rainfall of 624.1 mm and a maximum hourly rainfall of 201.9 mm,breaking the historical extreme value of hourly rainfall in China' Mainland.The water vapor transportation of rainstorm was here analyzed by means of conventional meteorological observation data,reanalysis data and the hybrid single-particle Lagrangian integrated trajectory model,and the results showed that the continuous easterly and southerly water vapor transport formed by a large-scale circulation anomaly led to a large-scale continuous heavy rain in Henan.The persistent vortex was the reason behind the long duration of precipitation.The configuration of high and low altitude systems provided favorable conditions for the development of the system;the sharply increasing of water vapor transport at the south boundary of Zhengzhou was particularly critical to the increase of precipitation;there were two main storm water vapor transport passages,of which the contribution of water vapor from the South China Sea(61.0%)was the largest at 700 hPa,with the Pacific Channel(33.0%)next to it;at 850 hPa,the contribution of water vapor from the Pacific Ocean was 82.3%,and that from the South China Sea was 17.7%.

关 键 词：极端暴雨 水汽输送 水汽收支 拉格朗日方法 

分 类 号：P458.121.1[天文地球—大气科学及气象学]