Characteristics of typhoon remote extreme precipitation in Chinese Mainland
Typhoon remote precipitation can be divided into Extreme Hourly Precipitation(EXHP)and Extremely Persistent Heavy Rainfall(EPHR).Because of its long distance and complex mechanism,it is a major challenge in the operational forecast of heavy precipitation.In order to deepen the understanding of the characteristics of typhoon remote extreme precipitation,this paper reveal the basic characteristics of the EXHP and EPHR events in Chinese Mainland by using the CMORPH satellite precipitation data from 2009 to 2019 and the best path data set of tropical cyclones.Results show that the Bohai Rim,the middle and lower reaches of the Yangtze River,and the Sichuan Basin are three high incidence areas of EPHR and EXHP events caused by typhoon remote precipitation.The criterion for typhoon remote precipitation EPHR is that the duration of heavy precipitation more than 5 hours.In three different areas,the threshold values of EXHP are 34.05,30.52,27.19 mm·h-1,respectively.The coincidence rate between the occurrence time of EPHR and EXHP is high.The duration of EPHR event can reach 44 h at most,and the maximum accumulated precipitation can reach 542.03 mm,while the hourly precipitation of EXHP is stronger.Extreme precipitation occurs frequently from night to morning around the Bohai Sea,mainly in the morning in the middle and lower reaches of the Yangtze River,and in the early morning in Sichuan Basin.The maximum typhoon intensity causing extreme precipitation in the middle and lower reaches of the Yangtze River is the strongest in the three places.The average typhoon moving speed of EXHP in the middle and lower reaches of the Yangtze River and Sichuan Basin is less than EPHR.The typhoon causing extreme precipitation can occur in the Bohai Rim at the longest distance,up to 4 333.1 km.
typhoon remote precipitationEXHPEPHRtemporal and spatial distribution characteristics
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