Identification of Dominant Climate Variables on Spatiotemporal Variation in Reference Evapotranspiration on the Loess Plateau,China  

作　　者：LI Xiaofei LIANG Wei JIAO Lei YAN Jianwu ZHANG Weibin WANG Fengjiao GOU Fen WANG Chengxi SHAO Quanqin 

机构地区：[1]School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China [2]National Demonstration Center for Experimental Geography Education,Shaanxi Normal University,Xi’an 710119,China [3]Xi’an Gu Bo Electronic Intelligent Technology Co.,Ltd,Xi’an,China [4]Key Laboratory of Terrestrial Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [5]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Geographical Science》2022年第4期620-642,共23页中国地理科学（英文版）

基　　金：Under the auspices of the Chinese Academy of Sciences(CAS)Strategic Leading Science and Technology Project Category A(No.XDA23100203);National Natural Science Foundation of China(No.42071144,41501093,41771118);Key Research and Development Program of China(No.2016YFC0501601);Fundamental Research Funds for the Central Universities(No.GK202003060)。

摘　　要：Reference evapotranspiration(ET_(0))is a vital component in hydrometeorological research and is widely applied to various aspects,such as water resource management,hydrological modeling,irrigation deployment,and understanding and predicting the influence of hydrologic cycle variations on future climate and land use changes.Quantifying the influence of various meteorological variables on ET_(0) is not only helpful for predicting actual evapotranspiration but also has important implications for understanding the impact of global climate change on regional water resources.Based on daily data from 69 meteorological stations,the present study analyzed the spatiotemporal pattern of ET_(0) and major contributing meteorological variables to ET_(0) from 1960 to 2017 by the segmented re-gression model,Mann-Kendall test,wavelet analysis,generalized linear model,and detrending method.The results showed that the annual ET_(0) declined slightly because of the combined effects of the reduction in solar radiation and wind speed and the increase in vapor pressure deficit(VPD)and average air temperature in the Loess Plateau(LP)during the past 58 yr.Four change points were detected in 1972,1990,1999,and 2010,and the annual ET_(0) showed a zigzag change trend of‘increasing-decreasing-increasing-decreasing-increasing’.Wind speed and VPD played a leading role in the ET_(0) changes from 1960 to 1990 and from 1991 to 2017,respectively.This study confirms that the dominant meteorological factors affecting ET_(0) had undergone significant changes due to global climate change and vegetation greening in the past 58 years,and VPD had become the major factor controlling the ET_(0) changes on the LP.The data presented herein will contribute to increasing the accuracy of predictions on future changes in ET_(0).

关 键 词：reference evapotranspiration(ET0) change points generalized linear model dominant factors vapor pressure deficit(VPD) Loess Plateau(LP) 

分 类 号：P339[天文地球—水文科学]