Climatic Characteristics and Area Classification of Persistent Regional Rainstorm in Henan Province
Gu Xiujie
Dong Junling
Xi Le
Wang Youhe
Li Zhou
Abstract：Based on the daily precipitation data at 113 stations in Henan Province during 1970-2021,this article analyzes the climatic characteristics of persistent regional rainstorms in Henan Province by using the methods of mathematical statistics and cluster analysis.Moreover,the rainstorm areas are classified into different types.The results show that a total of 117(276 d)persistent regional rainstorm events occurred in Henan Province in the 52 years,with an average of 2.3 times(5.3 d)per year,showing a slightly increasing trend,but not significant.During these years,there are four years seeing no persistent regional rainstorm events.The rainstorm events occur most(7 times)in 2000.The duration of the rainstorm events is 2 to 5 days,of which the processes lasting 2 days are the most,being 90 times in total,while the processes of 5 d long are the least,totally 4 times.There is no persistent regional rain-storm in winter,but the most in summer.The spatial distribution of the annual average frequency and the annual average number of rainstorm days of the persistent regional rainstorm processes are similar.The areas in the central and southern regions have significantly more persistent rainstorm events than other re-gions of the province,while the mountainous areas in western Henan see less persistent rainstorms than other regions of the province.The average intensity of persistent regional rainstorm in the province is drastically heavier than that of the non-persistent regional rainstorm.The rainstorm areas are divided into four spatial distribution types,namely,the northern Henan type,the central Henan type,the southern Henan type and the whole province type.The northern Henan type is located in the area north of the Yellow River,where the maximum daily average rainfall intensity is 57.6 mm·d-1.The central Henan type is located in the south of the central region,distributed in a zonal band pattern,and the maximum daily average rainfall intensity is 54.1 mm·d-1.The southern Henan type is concentrated and intense,with the maximum daily average rainfall intensity being 70.4 mm·d-1.The whole province type is con-centrated in the north-central region,with a maximum daily average rainfall intensity of 59.5 mm·d-1.
Keywords：persistent regional rainstormclimatic characteristicsclassification of rainstorm areas
Publication Date：2025-03-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 26-32 )