@article{Xiao-2020-Stomatal,
title = "Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration",
author = {Xiao, Mingzhong and
Yu, Zhongbo and
Kong, Dongdong and
Gu, Xihui and
Mammarella, Ivan and
Montagnani, Leonardo and
Arain, M. Altaf and
Merbold, Lutz and
Magliulo, Vincenzo and
Lohila, Annalea and
Buchmann, Nina and
Wolf, Sebastian and
Gharun, Mana and
H{\"o}rtnagl, Lukas and
Beringer, Jason and
Gioli, Beniamino},
journal = "Environmental Research Letters, Volume 15, Issue 9",
volume = "15",
number = "9",
year = "2020",
publisher = "IOP Publishing",
url = "https://gwf-uwaterloo.github.io/gwf-publications/G20-58001",
doi = "10.1088/1748-9326/ab9967",
pages = "094066",
abstract = "Abstract 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.",
}
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<abstract>Abstract 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.</abstract>
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%0 Journal Article
%T Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration
%A Xiao, Mingzhong
%A Yu, Zhongbo
%A Kong, Dongdong
%A Gu, Xihui
%A Mammarella, Ivan
%A Montagnani, Leonardo
%A Arain, M. Altaf
%A Merbold, Lutz
%A Magliulo, Vincenzo
%A Lohila, Annalea
%A Buchmann, Nina
%A Wolf, Sebastian
%A Gharun, Mana
%A Hörtnagl, Lukas
%A Beringer, Jason
%A Gioli, Beniamino
%J Environmental Research Letters, Volume 15, Issue 9
%D 2020
%V 15
%N 9
%I IOP Publishing
%F Xiao-2020-Stomatal
%X Abstract 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.
%R 10.1088/1748-9326/ab9967
%U https://gwf-uwaterloo.github.io/gwf-publications/G20-58001
%U https://doi.org/10.1088/1748-9326/ab9967
%P 094066
Markdown (Informal)
[Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration](https://gwf-uwaterloo.github.io/gwf-publications/G20-58001) (Xiao et al., GWF 2020)
ACL
- Mingzhong Xiao, Zhongbo Yu, Dongdong Kong, Xihui Gu, Ivan Mammarella, Leonardo Montagnani, M. Altaf Arain, Lutz Merbold, Vincenzo Magliulo, Annalea Lohila, Nina Buchmann, Sebastian Wolf, Mana Gharun, Lukas Hörtnagl, Jason Beringer, and Beniamino Gioli. 2020. Stomatal response to decreased relative humidity constrains the acceleration of terrestrial evapotranspiration. Environmental Research Letters, Volume 15, Issue 9, 15(9):094066.
