Characteristics of Extreme Precipitation Changes in Representative Cities of Different Climate Zones in China from 1961 to 2020
Based on the daily precipitation observational data from 1961 to 2020 in six representative cities from different climate zones in China,the trend of extreme precipitation in Chinese cities over the past 60 years was analyzed,using the percentile method to determine the extreme heavy precipitation threshold for each city.Results showed that the annual extreme precipita-tion,the number of extreme precipitation days,the intensity of extreme precipitation and their percentage showed consistent increasing trends in southern cities within the subtropical humid climate region,particularly in Guangzhou and Hangzhou.These cities,located near the southeast coast,experienced a significant increase in both annual extreme precipitation and the number of extreme precipitation days.However,the trend of annual extreme precipitation events in northern temperate cities,from west to east,roughly presented an"increase-decrease"spatial distribution pattern.In the semi-arid climate region of the middle temperate zone,Lanzhou showed a consistent increasing trend,with the percentage of annual extreme precipitation showing a significant rise.In the warm temperate and mid-temperate semi-humid climate regions,Beijing and Harbin showed a decreasing trend,and the annual extreme precipitation and days in Beijing decreased significantly,while the annual extreme precipitation intensity in Harbin weakened significantly.The peak month for extreme precipitation events was delayed from south to north,occurring primarily between May and August.Since 1990s,the frequency of extreme precipitation peak months has risen in southern cities while decreasing in northern cities.
extreme precipitationclimate changeclimatic zone differencesprecipitation thresholdspatiotemporal variation
NETL
NSTL
万方数据
