Altered energy partitioning across terrestrial ecosystems in the European drought year 2018 - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Philosophical Transactions of the Royal Society B: Biological Sciences Year : 2020

Altered energy partitioning across terrestrial ecosystems in the European drought year 2018

Heye Bogena
Christophe Chipeaux
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Edoardo Cremonese
Matthias Cuntz
Jiří Dušek
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Tarek El-Madany
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Silvano Fares
Milan Fischer
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Lenka Foltýnová
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Mana Gharun
Shiva Ghiasi
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Bert Gielen
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Pia Gottschalk
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Thomas Grünwald
Günther Heinemann
Bernard Heinesch
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Michal Heliasz
Jutta Holst
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Lukas Hörtnagl
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Andreas Ibrom
Joachim Ingwersen
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Gerald Jurasinski
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Giovanni Manca
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Janina Klatt
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Alexander Knohl
Franziska Koebsch
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Jan Konopka
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Mika Korkiakoski
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Natalia Kowalska
Pascal Kremer
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Bart Kruijt
Anne de Ligne
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Bernard Longdoz
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Corinna Rebmann
Vincenzo Magliulo
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Ivan Mammarella
Matthias Mauder
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Mirco Migliavacca
Meelis Mölder
Johan Neirynck
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Patrizia Ney
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Mats Nilsson
Eugénie Paul-Limoges
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Matthias Peichl
Andrea Pitacco
Arne Poyda
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Marilyn Roland
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Torsten Sachs
Marius Schmidt
Frederik Schrader
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Lukas Siebicke
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Ladislav Šigut
Eeva-Stiina Tuittila
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Andrej Varlagin
Nadia Vendrame
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Caroline Vincke
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Ingo Völksch
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Stephan Weber
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Christian Wille
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Hans-Dieter Wizemann
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Matthias Zeeman
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Harry Vereecken
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Abstract

Drought and heat events, such as the 2018 European drought, interact with the exchange of energy between the land surface and the atmosphere, potentially affecting albedo, sensible and latent heat fluxes, as well as CO 2 exchange. Each of these quantities may aggravate or mitigate the drought, heat, their side effects on productivity, water scarcity and global warming. We used measurements of 56 eddy covariance sites across Europe to examine the response of fluxes to extreme drought prevailing most of the year 2018 and how the response differed across various ecosystem types (forests, grasslands, croplands and peatlands). Each component of the surface radiation and energy balance observed in 2018 was compared to available data per site during a reference period 2004–2017. Based on anomalies in precipitation and reference evapotranspiration, we classified 46 sites as drought affected. These received on average 9% more solar radiation and released 32% more sensible heat to the atmosphere compared to the mean of the reference period. In general, drought decreased net CO 2 uptake by 17.8%, but did not significantly change net evapotranspiration. The response of these fluxes differed characteristically between ecosystems; in particular, the general increase in the evaporative index was strongest in peatlands and weakest in croplands. This article is part of the theme issue ‘Impacts of the 2018 severe drought and heatwave in Europe: from site to continental scale’.

Dates and versions

hal-03207504 , version 1 (25-04-2021)

Identifiers

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Alexander Graf, Anne Klosterhalfen, Nicola Arriga, Christian Bernhofer, Heye Bogena, et al.. Altered energy partitioning across terrestrial ecosystems in the European drought year 2018. Philosophical Transactions of the Royal Society B: Biological Sciences, 2020, 375 (1810), pp.20190524. ⟨10.1098/rstb.2019.0524⟩. ⟨hal-03207504⟩
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