气候变化领域集成服务门户(CCPortal): Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment

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DOI	10.1029/2020JD032371
	Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment
	Liu Z.; Cheng L.; Zhou G.; Chen X.; Lin K.; Zhang W.; Chen X.; Zhou P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:7
英文摘要	Understanding the complex relationship between evapotranspiration and climate conditions and land surface characteristics is important within the context of global warming and increasing anthropogenic stressors. Based on the Budyko theory, we derived general frameworks for describing how the evapotranspiration ratio (actual evapotranspiration/precipitation, AET/P) responds to changes in the aridity index (potential evapotranspiration/precipitation, PET/P) and watershed characteristics (m). The frameworks show that the sensitivity of AET/P to PET/P decreases with increasing aridity but such decreasing pattern also depends on different watershed characteristics. The sensitivity coefficient tends to be greater in the energy-limited regimes (above 0.3) than in the water-limited regimes. The slope of the sensitivity curve becomes steeper for larger m values (e.g., m > 2). In addition, the sensitivity of the AET/P to m shows an asymmetrical unimodal curve, while the strongest sensitivity (inflection point) of evapotranspiration ratio to m occurs at PET/P > 1. We further examined spatial patterns of these sensitivities and the relative roles of PET/P (RCPET/P) and m (RCm) to AET/P over 91 hydrological basins worldwide. The tropical humid basins present the strongest sensitivity of AET/P to PET/P, while higher sensitivity coefficients of AET/P to m can be found in very cold basins. The changes in the sensitivity of evapotranspiration ratio to PET/P and m between 1930–1970 and 1971–2008 were assessed for these basins across broad climatic gradients. Most of these basins show a positive change in RCPET/P but a negative shift in RCm in the warming world. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aridity index; evapotranspiration; hydrological response; relative contribution; watershed characteristics
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186076
作者单位	Center for Water Resources and Environment, School of Civil Engineering, Sun Yat-sen University, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Department of Geosciences, University of Arkansas, Fayetteville, AR, United States; College of Applied Ecology, Nanjing University of Information Science and Technology, Nanjing, China; Faculty of Automation, Zhongkai University of Agriculture and Engineering, Guangzhou, China; School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Guangdong Open Library of Geospatial Information Technology and Application, Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Liu Z.,Cheng L.,Zhou G.,et al. Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment[J],2020,125(7).
APA	Liu Z..,Cheng L..,Zhou G..,Chen X..,Lin K..,...&Zhou P..(2020).Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment.Journal of Geophysical Research: Atmospheres,125(7).
MLA	Liu Z.,et al."Global Response of Evapotranspiration Ratio to Climate Conditions and Watershed Characteristics in a Changing Environment".Journal of Geophysical Research: Atmospheres 125.7(2020).