Interdecadal variation of drought patterns and associated influencing factors in the north-south transitional zone of China  

作　　者：DONG Qingdong ZHU Lianqi DUAN Zheng WANG Liyuan CHEN Chaonan LI Yanhong ZHU Wenbo GURUNG Sher Bahadur 

机构地区：[1]The College of Geography and Environmental Science,Henan University,Kaifeng,Henan,475004,China [2]Department of Physical Geography and Ecosystem Science,Lund University,Lund,S-22362,Sweden [3]Central Department of Geography,Tribhuvan University,Kathmandu,44600,Nepal

出　　处：《Journal of Geographical Sciences》2024年第7期1253-1279,共27页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.U23A2020;National Science and Technology Basic Resource Investigation Program,No.2023FY100701。

摘　　要：In the context of global warming,escalating water cycles have led to a surge in drought frequency and severity.Yet,multidecadal fluctuations in drought and their multifaceted influencing factors remain inadequately understood.This study examined the multidecadal changes in drought characteristics(frequency,duration,and severity)and their geographical focal points within China's north-south transitional zone,the Qinling-Daba Mountains(QDM),from 1960 to 2017 using the Standardized Precipitation Evapotranspiration Index(SPEI).In addition,a suite of eight scenarios,correlation analysis,and wavelet coherence were used to identify the meteorological and circulation factors that influenced drought characteristics.The results indicate the following:(1)From 1960 to 2017,the QDM experienced significant interdecadal variations in drought frequency,duration,and severity,the climate was relatively humid before the 1990s,but drought intensified thereafter.Specifically,the 1990s marked the period of the longest drought duration and greatest severity,while the years spanning 2010 to 2017 experienced the highest frequency of drought events.(2)Spatially,the Qinling Mountains,particularly the western Qinling Mountain,exhibited higher drought frequency,duration,and severity than the Daba Mountains.This disparity can be attributed to higher rates of temperature increase and precipitation decrease in the western Qinling Mountain.(3)Interdecadal variations in droughts in the QDM were directly influenced by the synergistic effects of interdecadal fluctuations in air temperature and precipitation.Circulation factors modulate temperature and precipitation through phase transitions,thereby affecting drought dynamics in the QDM.The Atlantic Multidecadal Oscillation emerges as the primary circulation factors influencing temperature changes,with a mid-1990s shift to a positive phase favoring warming.The East Asian Summer Monsoon and El Ni?o-Southern Oscillation are the main circulation factors affecting precipitation changes,with positive pha

关 键 词：DROUGHT standardized precipitation evapotranspiration index multidecadal shift transitional zone Qinling-Daba Mountains 

分 类 号：P426.616[天文地球—大气科学及气象学]