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

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 CO2 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 CO2 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’.

Details

Number of pages 1
Volume 375
Magazine issue 1810
Pages (to-from) 20190524
Type A1: Web of Science-article
Category Research
Magazine Philosophical Transactions of the Royal Society B-Biological Sciences
Issns 0962-8436
Language English
Bibtex

@misc{032511ef-9800-49eb-a32f-2cbc181025b1,
title = "Altered energy partitioning across terrestrial ecosystems in the European drought year 2018",
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 CO2 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 CO2 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’.",
author = "Alexander Graf and Anne Klosterhalfen and Nicola Arriga and Christian Bernhofer and Heye Bogena and Frédéric Bornet and Nicolas Brüggemann and Christian Brümmer and Nina Buchmann and Jinshu Chi and Christophe Chipeaux and Edoardo Cremonese and Matthias Cuntz and Jiří Dušek and Tarek S. El-Madany and Silvano Fares and Milan Fischer and Lenka Foltýnová and Mana Gharun and Shiva Ghiasi and Bert Gielen and Pia Gottschalk and Thomas Grünwald and Günther Heinemann and Bernard Heinesch and Michal Heliasz and Jutta Holst and Lukas Hörtnagl and Andreas Ibrom and Joachim Ingwersen and Gerald Jurasinski and Janina Klatt and Alexander Knohl and Franziska Koebsch and Jan Konopka and Mika Korkiakoski and Natalia Kowalska and Pascal Kremer and Bart Kruijt and Sebastien Lafont and Joël Léonard and Anne De Ligne and Bernard Longdoz and Denis Loustau and Vincenzo Magliulo and Ivan Mammarella and Giovanni Manca and Matthias Mauder and Mirco Migliavacca and Meelis Mölder and Johan Neirynck and Patrizia Ney and Mats B. Nilsson and Eugénie Paul-Limoges and Matthias Peichl and Andrea Pitacco and Arne Poyda and Corinna Rebmann and Marilyn Roland and Torsten Sachs and Marius Schmidt and Frederik Schrader and Lukas Siebicke and Ladislav Šigut and Eeva-Stiina Tuittila and Andrej Varlagin and Nadia Vendrame and Caroline Vincke and Ingo Völksch and Stephan Weber and Christian Wille and Hans-Dieter Wizemann and Matthias Zeeman and Harry Vereecken",
year = "2020",
month = oct,
day = "26",
doi = "https://doi.org/10.1098/rstb.2019.0524",
language = "English",
publisher = "Instituut voor Natuur- en Bosonderzoek",
address = "Belgium,
type = "Other"
}

Authors

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