Analysis of spatial and temporal evolution characteristics of history and future precipitation in the Yalu River basin
The Yalu River Basin is a transboundary basin between China and North Korea.Changes in climate ele-ments such as precipitation in this basin are crucial for preventing flood and drought risks.However,there are cur-rently few studies on the precipitation characteristics of the basin,especially based on the latest climate change model CMIP6.Based on the ERA5-Land reanalysis dataset and precipitation data from 8 models and 3 scenarios in the latest CMIP6,this paper uses the M-K test and Morlet wavelet analysis methods to analyze the historical and future precipitation characteristics of the Yalu River basin.The results show that:(1)The multi-year average pre-cipitation on the North Korean side during the historical period(1950-2022)is slightly higher than that on the Chi-nese side,and there is no significant change trend in annual precipitation within the basin.(2)There are two cy-cles of 29 years and 49 years in the historical precipitation of the basin,of which 49 years is the first main cycle.(3)Annual precipitation in the basin will show a significant increasing trend in the future period of 2025 to 2100,and there is a spatial distribution characteristic that gradually decreases from southeast to northwest.The precipitati-on on the North Korean side is greater than that on the Chinese side,and there are obvious differences in the change trends of annual precipitation in the near future period of 2025 to 2060 and the far future of 2065 to 2100.(4)The annual precipitation cycle characteristics of the three scenarios in the future are relatively close,and the first main cycle is all 52 years.This study can enrich the research results based on CMIP6 and provide a scientific reference for flood control and drought relif management in the Yalu River basin.
data of datasettendency testwavelet analysisclimate changeperiodic characteristics