Precipitation variation characteristics in the Three Gorges Region of the Yangtze River from 1961 to 2020
The study analyzes the spatiotemporal variation characteristics of annual,seasonal,and monthly precipita-tion of different intensity levels using daily precipitation data from 33 national ground meteorological observation stations in the Three Gorges region of the Yangtze River from 1961 to 2020.The results indicate that the Three Gorges region is abundant in precipitation,with an average annual precipitation of 1200 mm and an annual precipi-tation day of 155 d.The monthly variations of precipitation amount and intensity in this region are unimodal,with the peaking pattern in July;while the monthly variations of precipitation days are bimodal,with peaks in spring and secondary peaks in autumn.Over the past 60 years,there has been a significant decreasing trend in the annual precipitation days in the Three Gorges region,while annual precipitation intensity has significantly increased.How-ever,there is no significant trend in annual precipitation amount.The number of precipitation days in spring,au-tumn,and winter has declined significantly,with a larger reduction in light rain days from October to December.Meanwhile,precipitation intensity has markedly increased in autumn and winter,with notable increases occurring in January,February,and November.The spatial distribution of annual precipitation days in the Three Gorges region shows a consistent decreasing trend across the entire region,while precipitation intensity generally shows an in-creasing trend;the distribution of precipitation amount changes is uneven,with a decrease in the central region and an increase in the eastern and western regions.
国家科技期刊平台
NSTL
万方数据
