气候变化领域集成服务门户(CCPortal): Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration

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DOI	10.1088/1748-9326/ab9967
	Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration
	Xiao M.; Yu Z.; Kong D.; Gu X.; Mammarella I.; Montagnani L.; Arain M.A.; Merbold L.; Magliulo V.; Lohila A.; Buchmann N.; Wolf S.; Gharun M.; Hörtnagl L.; Beringer J.; Gioli B.
发表日期	2020
ISSN	17489318
卷号	15 期号:9
英文摘要	Terrestrial evapotranspiration (ET) is thermodynamically expected to increase with increasing atmospheric temperature; however, the actual constraints on the intensification of ET remain uncertain due to a lack of direct observations. Based on the FLUXNET2015 Dataset, we found that relative humidity (RH) is a more important driver of ET than temperature. While actual ET decrease at reduced RH, potential ET increases, consistently with the complementary relationship (CR) framework stating that the fraction of energy not used for actual ET is dissipated as increased sensible heat flux that in turn increases potential ET. In this study, we proposed an improved CR formulation requiring no parameter calibration and assessed its reliability in estimating ET both at site-level with the FLUXNET2015 Dataset and at basin-level. Using the ERA-Interim meteorological dataset for 1979-2017 to calculate ET, we found that the global terrestrial ET showed an increasing trend until 1998, while the trend started to decline afterwards. Such decline was largely associated with a reduced RH, inducing water stress conditions that triggered stomatal closure to conserve water. For the first time, this study quantified the global-scale implications of changes in RH on terrestrial ET, indicating that the temperature-driven acceleration of the terrestrial water cycle will be likely constrained by terrestrial vegetation feedbacks. © 2020 The Author(s). Published by IOP Publishing Ltd.
语种	英语
scopus关键词	Atmospheric humidity; Evapotranspiration; Heat flux; Plants (botany); Complementary relationship; Direct observations; Parameter calibration; Sensible heat flux; Stomatal closures; Stomatal response; Terrestrial evapotranspiration; Terrestrial vegetation; Atmospheric temperature; evapotranspiration; physiological response; relative humidity; stomata; terrestrial ecosystem
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153775
作者单位	State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China; College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China; Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, 510275, China; Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China; Institute for Atmosphere and Earth System Research/Physics, Faculty of Science, University of Helsinki, PO Box 68, Finland; Faculty of Science and Technology, Free University of Bolzano, Piazza Universita, Universitatsplatz 5, Bolzano, I-39100, Italy; Forest Services, Autonomous Province of Bolzano, Via Brennero 6, Bolzano, 39100, Italy; School of Geography and Earth Sciences and McMaster Centre for Climate Change, McMaster University, Hamilton, ON, Canada; Mazingira Centre, International Livestock Research Institute (ILRI), Nairobi, 00100, Kenya; Department of Environmental Systems Science...
推荐引用方式 GB/T 7714	Xiao M.,Yu Z.,Kong D.,et al. Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration[J],2020,15(9).
APA	Xiao M..,Yu Z..,Kong D..,Gu X..,Mammarella I..,...&Gioli B..(2020).Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration.Environmental Research Letters,15(9).
MLA	Xiao M.,et al."Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration".Environmental Research Letters 15.9(2020).