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 Mainland China.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 configu-ration 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 criti-cal 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 Pa-cific 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％.
万方数据
