Assessing the impact of climate change on potential evapotranspiration in Aksu River Basin

作     者：ZHANG Shouhong LIU Suxia MO Xingguo SHU Chang SUN Yang ZHANG Chun 

作者机构：Key Laboratory of Water Cycle & Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Journal of Geographical Sciences》 (地理学报（英文版）)

年 卷 期：2011年第21卷第4期

页      面：609-620页

核心收录：

学科分类：081504[工学-水利水电工程] 07[理学] 070601[理学-气象学] 08[工学] 0815[工学-水利工程] 0706[理学-大气科学] 

基　　金：National Key Basic Research Development Program of China No.2009CB421307 No.2010CB428404 National Natural Science Foundation of China No.41071024 

主　　题：climate change reference evapotranspiration Penman-Monteith method Aksu River Basin 

摘      要：Evapotranspiration is one of the key components of hydrological processes. Assessing the impact of climate factors on evapotranspiration is helpful in understanding the impact of climate change on hydrological processes. In this paper, based on the daily meteorological data from 1960 to 2007 within and around the Aksu River Basin, reference evapotranspiration （RET） was estimated with the FAO Penman-Monteith method. The temporal and spatial variations of RET were analyzed by using ARCGIS and Mann-Kendall method. Multiple Regression Analysis was employed to attribute the effects of the variations of air temperature, solar radiation, relative humidity, vapour pressure and wind speed on RET. The results showed that average annual RET in the eastern plain area of the Aksu River Basin was about 1100 mm, which was nearly twice as much as that in the western mountainous area. The trend of annual RET had significant spatial variability. Annual RET was reduced significantly in the southeastern oasis area and southwestern plain area and increased slightly in the mountain areas. The amplitude of the change of RET reached the highest in summer, contributing most of the annual change of RET. Except in some high elevation areas where relative humidity predominated the change of the RET, the variations of wind velocity predominated the changes of RET almost throughout the basin. Taking Kuqa and Ulugqat stations as an example, the variations of wind velocity accounted for more than 50% of the changes of RET.