水科学进展2024，Vol.35Issue(1)：24-37,14.DOI:10.14042/j.cnki.32.1309.2024.01.003
基于多源数据的长江流域1982-2022年骤旱事件时空演变
Temporal and spatial evolution of flash drought events in the Yangtze River basin from 1982 to 2022 based on multi-source data
摘要
Abstract
A flash drought is an extreme drought phenomenon that has high suddenness and intensity and can pose a severe threat to agricultural production and ecosystems.In recent years,flash droughts have occurred frequently in the Yangtze River basin,but the temporal and spatial evolution characteristics of these flash droughts are still unclear.In this study,based on Global Land Evaporation Amsterdam Model(GLEAM),Global Land Data Assimilation System(GLDAS),and ERA5-Land data,the standardized evaporation stress ratio and changes in its value were used as identification indicators to identify flash drought events in the Yangtze River basin from 1982 to 2022,and comprehensively analyze their spatial distribution and temporal evolution characteristics.Additionally,the study examined the flash drought events in the Yangtze River basin in 2022 due to their severity and singularity.The results were as follows:① In terms of spatial distribution,the Jinsha River in the upper reaches and the large reservoirs and lakes in the middle and lower reaches of the Yangtze River basin had the highest frequency and intensity of flash drought events.(2)Temporally,the frequency,average duration,and intensity of flash drought events all showed an insignificant upward trend in the Yangtze River basin as a whole from 1982 to 2022,while some smaller areas with significant trends exhibited a notable trend reversal around 2001.(3)The Yangtze River basin was affected by extreme high temperatures and a heat wave in the summer of 2022 and suffered a large-scale flash drought event that was wide in scope,long in duration,and spatially propagated from upstream to downstream.关键词
骤旱/时空演变/多源数据/标准化蒸发胁迫比/长江流域Key words
flash drought/spatiotemporal evolution/multi-source data/standardized evaporative stress ratio/the Yangtze River basin分类
天文与地球科学引用本文复制引用
熊立华,李姝仪,查悉妮..基于多源数据的长江流域1982-2022年骤旱事件时空演变[J].水科学进展,2024,35(1):24-37,14.基金项目
国家自然科学基金资助项目(U2240201 （）
41890822)The study is financially supported by the National Natural Science Foundation of China(No.U2240201 （）
No.41890822). （）
