Climate-driven changes in drought metrics across the Yellow River Basin based on Coupled Model Intercomparison Project Phase 6  

基于CMIP6的气候驱动下黄河流域干旱指标变化

作　　者：LIU Jiayuan LIU Xianfeng LIANG Juan FENG Yu 刘嘉媛;刘宪锋;梁娟;冯禹

机构地区：[1]School of Geography and Tourist,Shaanxi Normal University,Xi'an 710119,China [2]Ningbo Institute of Digital Twin,Eastern Institute for Advanced Study,Ningbo 315200,Zhejiang,China

出　　处：《Journal of Geographical Sciences》2024年第9期1841-1856,共16页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.42171095,No.42371123;General Project of Key Research and Development Program of Shaanxi Province,No.2024SF-YBXM-532;The Social Science Foundation of Shaanxi Province,No.2020D039;Fundamental Research Funds for the Central Universities,No.GK202201008;Open Foundation of the State Key Laboratory of Urban and Regional Ecology of China,No.SKLURE2022-2-1。

摘　　要：Recent climate change has accelerated the global hydrological cycle, substantially affecting drought metrics such as drought duration and drought propagation;however, knowledge of drought patterns in these metrics remains limited. Here, we aimed to address the evolution and influencing factors of major drought metrics under past and future climate scenarios within the Yellow River Basin(YRB) based on Coupled Model Intercomparison Project Phase 6(CMIP6). Accordingly, we investigated the changes in drought duration for meteorological drought and agricultural drought across the YRB and identified the variability in drought propagation time from meteorological drought to agricultural drought by using a standardized precipitation/soil moisture index and run theory. Meteorological and agricultural drought duration, and propagation time, increased from 1850 to 2014, decreased significantly from 2015 to 2100 with change trends of –0.0027, –0.0197, and –0.002 month/year, respectively. Drought duration had a negative sensitivity to humidification, and agricultural drought was more sensitive than meteorological drought. Propagation time exhibited a greater sensitivity to meteorological humidification than agricultural humidification. The results also suggest that precipitation, evapotranspiration, and soil moisture are the main drivers of drought metric changes, with air temperature and crop cover exhibiting a strong indirect effect on drought metrics in the YRB. Decreased propagation time from meteorological to agricultural drought and decreased duration provide evidence for the accelerated occurrence and increased impact of drought, highlighting the importance of a more comprehensive understanding of drought metric changes under rapid climate change.

关 键 词：drought duration drought propagation climate change HUMIDIFICATION Yellow River Basin CMIP6 

分 类 号：P426.616[天文地球—大气科学及气象学]