Temporal and Spatial Trends of Precipitation and Mutation in Guangdong Province over the Past 60 Years

Abstract

Based on the Mann-Kendall test,linear regression analysis,and sliding t-test,this study analyzes the daily precipitation data from 32 meteorological stations in Guangdong Province from 1960 to 2019.The results show that except for Guangzhou and Zengcheng in the Pearl River Delta region,which exhibit a significant increasing trend in annual precipitation,there is no significant increasing trend in annual precipitation in other regions of Guangdong Province.The spatial distribution of average annual precipitation shows that the Pearl River Delta and its adjacent areas are the areas with the highest precipitation,which decreases gradually towards the surrounding areas.In the analysis of annual precipitation mutations,eight meteorological stations are found to have different numbers of mutation points in different years.Among these,only the Pearl River Delta region shows an increasing mutation in annual precipitation in 1972.The research results can provide a reference for the management of water resources and flood prevention strategies in Guangdong Province to cope with climate change.