Processes driving nocturnal transpiration and implications for estimating land evapotranspiration
Víctor Resco de Dios,Jacques Roy,Juan Pedro Ferrio,Josu G. Alday,Damien Landais,Alexandru Milcu,Arthur Gessler +6 more
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TLDR
Contrary to daytime responses and to conventional wisdom, nocturnal transpiration was not affected by previous radiation loads or carbon uptake, and showed a temporal pattern independent of vapour pressure deficit or temperature, because of endogenous controls on stomatal conductance via circadian regulation.Abstract:
Evapotranspiration is a major component of the water cycle, yet only daytime transpiration is currently considered in Earth system and agricultural sciences. This contrasts with physiological studies where 25% or more of water losses have been reported to occur occurring overnight at leaf and plant scales. This gap probably arose from limitations in techniques to measure nocturnal water fluxes at ecosystem scales, a gap we bridge here by using lysimeters under controlled environmental conditions. The magnitude of the nocturnal water losses (12-23% of daytime water losses) in row-crop monocultures of bean (annual herb) and cotton (woody shrub) would be globally an order of magnitude higher than documented responses of global evapotranspiration to climate change (51-98 vs. 7-8 mm yr(-1)). Contrary to daytime responses and to conventional wisdom, nocturnal transpiration was not affected by previous radiation loads or carbon uptake, and showed a temporal pattern independent of vapour pressure deficit or temperature, because of endogenous controls on stomatal conductance via circadian regulation. Our results have important implications from large-scale ecosystem modelling to crop production: homeostatic water losses justify simple empirical predictive functions, and circadian controls show a fine-tune control that minimizes water loss while potentially increasing posterior carbon uptake.read more
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Recent decline in the global land evapotranspiration trend due to limited moisture supply
Martin Jung,Markus Reichstein,Philippe Ciais,Sonia I. Seneviratne,Justin Sheffield,Michael L. Goulden,Gordon B. Bonan,Alessandro Cescatti,Jiquan Chen,Richard de Jeu,A. Johannes Dolman,Werner Eugster,Dieter Gerten,Damiano Gianelle,Nadine Gobron,Jens Heinke,John S. Kimball,Beverly E. Law,Leonardo Montagnani,Qiaozhen Mu,Brigitte Mueller,Keith W. Oleson,Dario Papale,Andrew D. Richardson,Olivier Roupsard,S. W. Running,Enrico Tomelleri,Nicolas Viovy,Ulrich Weber,Christopher B. Williams,Eric F. Wood,Sönke Zaehle,Ke Zhang +32 more
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A review of global terrestrial evapotranspiration: observation, modeling, climatology, and climatic variability
Kaicun Wang,Robert E. Dickinson +1 more
TL;DR: In this paper, the authors survey the basic theories, observational methods, satellite algorithms, and land surface models for terrestrial evapotranspiration, including a long-term variability and trends perspective.