Sensitivity of Potential Evapotranspiration Estimation to the Thornthwaite and Penman–Monteith Methods in the Study of Global Drylands

作     者：Qing YANG Zhuguo MA Ziyan ZHENG Yawen DUAN 

作者机构：Key Laboratory of Regional Climate–Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2017年第34卷第12期

页      面：1381-1394页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0825[工学-航空宇航科学与技术] 

基　　金：sponsored by the National K&D Program of China (Grant No. 2016YFA0600404) the China Special Fund for Meteorological Research in the Public Interest (Grant No. GYHY201106028 and GYHY2015060011) the National Natural Science Foundation of China (Grant No. 41530532) the Jiangsu Collaborative Innovation Center for Climate Change 

主　　题：potential evapotranspiration global drylands Thornthwaite Penman–Monteith 

摘      要：Drylands are among those regions most sensitive to climate and environmental changes and human-induced *** most widely accepted definition of the term dryland is a ratio,called the Surface Wetness Index(SWI),of annual precipitation to potential evapotranspiration(PET)being below *** is commonly estimated using the Thornthwaite(PET Th)and Penman–Monteith equations(PET PM).The present study compared spatiotemporal characteristics of global drylands based on the SWI with PET Th and PET *** showed vast differences between PET Th and PET PM;however,the SWI derived from the two kinds of PET showed broadly similar characteristics in the interdecadal variability of global and continental drylands,except in North America,with high correlation coefficients ranging from 0.58 to *** was found that,during 1901–2014,global hyper-arid and semi-arid regions expanded,arid and dry sub-humid regions contracted,and drylands underwent interdecadal *** was because precipitation variations made major contributions,whereas PET changes contributed to a much lesser ***,distinct differences in the interdecadal variability of semi-arid and dry sub-humid regions were *** indicated that the influence of PET changes was comparable to that of precipitation variations in the global dry–wet transition ***,the contribution of PET changes to the variations in global and continental drylands gradually enhanced with global warming,and the Thornthwaite method was found to be increasingly less applicable under climate change.