Applicability of Different Indices for Delineating the Boundary of Arid Region:A Case Study in Northwestern China  

作　　者：Xue Peng Xiang Li Yingyibing Shen Xuehua Che Shipei Dong Zhuolun Li 

机构地区：[1]Key Laboratory of Western China's Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Center for Glacier and Desert Research,Lanzhou University,Lanzhou 730030,China

出　　处：《Journal of Earth Science》2025年第1期212-222,共11页地球科学学刊(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.42271003,42301001);the Fundamental Research Funds for the Central Universities(No.lzujbky-2022-ey09);the China Postdoctoral Science Foundation(No.GZB20230275);Supercomputing Center of Lanzhou University。

摘　　要：Arid regions are vital components of Earth’s land surface.Clarifying the area/boundary of arid region is crucial for comprehending area changes and potential mechanisms.However,the accuracy and applicability of arid region boundary delineated by different indices remain unclear.In this study,the annual precipitation(AP),humidity index(H),and aridity index(K)were calculated for delineating arid region of China using 106 meteorological stations during 1990–2019.The results suggest that AP and H can accurately delineate arid region,because they are consistent with the distribution of typical soil and vegetation in arid region,whereas K is not.Moreover,AP is the best index for delineating arid region in regions with limited meteorological data,especially in studying long-term patterns and mechanisms of area changes.The accuracy of delineating arid region using H is enhanced in regions with abundant meteorological data.Over the past 30 years,influenced by the increase of atmospheric moisture influx and precipitation,the area in arid region of northwestern China decreased by 70×10^(3)–90×10^(3)km^(2),resulting in the present area of approximately 1.55×10^(6)km^(2).This study provides appropriate indices for delineating arid region,contributing to improving our knowledge of regional responses difference to climate change.

关 键 词：climate regionalization arid region climate change northwestern China Earth Science 

分 类 号：P426.616[天文地球—大气科学及气象学] P467