The spatiotemporal variation characteristics of extreme temperature events in the Liaohe River Basin from 1961 to 2020

School of Water Conservancy and Environment, University of Jinan, Jinan, Shandong, 250022, China

^* Corresponding author’s e-mail: 624473312@qq.com

Abstract

In recent years, China has frequently experienced extreme climate events. Analyzing the trends in these extreme weather changes is crucial to mitigating the adverse impacts on human lives and preventing the disruption of water resource distribution. Based on the daily maximum and daily minimum temperatures at 139 meteorological grid points in the Liaohe River Basin from 1961 to 2020, six extreme temperature indices were calculated and selected to explore the temporal and spatial characteristics of the extreme temperature events in the Liaohe River Basin by using the linear trend analysis, the Mann-Kendall (M-K) mutation test, and the Kriging interpolation method. The results show that the index characterizing extreme warm events in the Liaohe River Basin in time shows a significant upward trend on both interannual and seasonal scales, while the index characterizing extreme cold events shows a significant downward trend. The mutation points of interannual changes were mainly distributed between 1980 and 2010. In the spatial distribution, the Liaohe River Basin as a whole is warming, and the northern part is warming more than the southern part.