Spatiotemporal variation of annual extreme temperature in the Yangtze River Basin
CHEN Tianyu1， LI Dongfeng1， WANG Lixue1， MA Haoyan1， ZHAO Zhimeng1， ZHANG Wen2， WU Jiabin3， XU Lili1
(1.College of Urban and Environmental Sciences， Central China Normal University， Wuhan 430079， China；2.School of Remote Sensing and Information Engineering， Wuhan University， Wuhan 430079， China；3.Institute of Water Resources for Pastoral Area， MWR， Huhehot 010020，China)
Abstract：In recent years， extreme climatic events occurred frequently in the Yangtze River Basin. The paper selected temperature data of 137 stations from 1962 to 2021， and analyzed the temporal and spatial characteristics of annual extreme temperature from the basin and station scales based on time series trend and abrupt detection methods. The results indicated that： 1) The annual extreme minimum and maximum temperatures showed significant upward trends， with the growth rates of 0.35 ℃·(10a-1) and 0.26 ℃·(10a-1) respectively. 2) The stations with annual extreme minimum and maximum temperatures significantly increased accounted for 97.08%(133 stations) and 91.97%(126 stations) respectively. In the lower reaches of the Yangtze River Basin， the growth rate of annual extreme temperature at stations increased rapidly. 3) After a warming abrupt change in 2001， the growth rate of annual extreme maximum temperature increased further， however， there was no abrupt change in the annual extreme minimum temperature. 4) 36.5% of stations had abrupt changes in annual extreme minimum temperature， which mainly occurred during 1990-1998， especially in 1994. 80.3% of stations had abrupt changes in annual extreme maximum temperature， which mainly occurred during 1999-2000， especially in the early 2000s. This study revealed the 60-year warming trend and abrupt change of extreme temperature in the Yangtze River Basin， which is of great significance for understanding the spatial and temporal process of regional extreme temperature， predicting the future climate trend， formulating disaster prevention and mitigation strategies， leading regional climate governance， and achieving carbon peaking and carbon neutrality goals.
2023, Vol. 57 
