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Record Flood-Producing Rainstorms of July 2021 and August 1975 in Henan of China:Comparative Synoptic Analysis Using ERA5

查看全文 作　　者：Jian [1,3]RAO;Jin [2]XIE;Yong [2]CAO;Suxing [1,3]ZHU;Qian [1,3]LU 高影响力作者 机构地区：[1]Key Laboratory of Meteorological Disaster of Ministry of Education(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing,210044,China;[2]National Meteorological Centre,China Meteorological Administration,Beijing,100081,China;[3]School of Atmospheric Sciences,Nanjing University of Information Science&Technology,Nanjing,210044,China高影响力机构 出　　处：《Journal of Meteorological Research》索引2022年第36卷第6期,共15页高影响力期刊 基　　金：Supported by the National Key Research and Development Program of China (2021YFC3000903);National Natural Science Foundation of China (42030605)。 摘　　要：This study compares two rainstorms that swept through Henan Province of China in July 2021 and August 1975.The heavy rainfall and related synoptic systems and processes are diagnosed based on hourly ERA5 reanalysis data and precipitation observations from the China Meteorological Administration.It is estimated that most of the daily rainfall in Henan was caused by synoptic-scale precipitation,with the sub-synoptic convective rainfall intermittently dominating some of the hourly total rainfall.The rainband moved at about 2 m s^(-1) during the July 2021 rainstorm,whereas it was almost stationary during the August 1975 rainstorm when the heavy rainfall was concentrated in southern Henan.A double-typhoon circulation pattern with a subtropical high over the Bohai and Yellow Seas was observed during both rainstorms.The heavy rainfall during the July 2021 event was controlled remotely by Typhoons Cempaka and In-Fa,which provided a path for the transport of moisture via the southerly jet associated with Typhoon Cempaka and the easterly(or southeasterly)jet associated with Typhoon In-Fa.The rainstorm in August1975 was caused more directly by Typhoon Nina,which made landfall in Fujian Province and moved toward Henan Province.The rainfall around the inverted trough of the motionless Typhoon Nina produced a cumulative effect.The two rainstorms also differed in their circulation patterns in the upper troposphere.The intrusion of high potential vorticity air over Central China occurred in the July 2021 extreme rainstorm,whereas the South Asian high was enhanced and biased further north during the August 1975 rainstorm.Further analysis showed that the northward and westward transport of moisture took place during the July 2021 rainstorm,whereas the westward transport of moisture from the east of Henan dominated near the inverted trough of Typhoon Nina during the August 1975 rainstorm. 关 键 词：August 1975(“75.8”)rainstorm July 2021(“21.7”)rainstorm Henan rainstorms double-typhoon circulation patterns
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