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Research article - Peer-reviewed, 2020

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

Graf, Alexander; Klosterhalfen, Anne; Arriga, Nicola; Bernhofer, Christian; Bogena, Heye; Bornet, Frederic; Brueggemann, Nicolas; Bruemmer, Christian; Buchmann, Nina; Chi, Jinshu; Chipeaux, Christophe; Cremonese, Edoardo; Cuntz, Matthias; Dusek, Jiri; El-Madany, Tarek S.; Fares, Silvano; Fischer, Milan; Foltynova, Lenka; Gharun, Mana; Ghiasi, Shiva;
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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'.

Keywords

eddy covariance; energy balance; evapotranspiration; heat flux; net carbon uptake; water-use efficiency

Published in

Philosophical Transactions B: Biological Sciences
2020, volume: 375, number: 1810, article number: 20190524

Authors' information

Graf, Alexander
Jülich Research Centre
Klosterhalfen, Anne
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Klosterhalfen, Anne
Jülich Research Centre
Arriga, Nicola
European Commission Joint Research Centre
Bogena, Heye
Jülich Research Centre
Bernhofer, Christian
Technische Universitat Dresden
Bornet, Frederic
Universite de Picardie Jules Verne (UPJV)
Brüggemann, Nicolas
Jülich Research Centre
Bruemmer, Christian
Johann Heinrich von Thunen Institute
Buchmann, Nina
ETH Zurich
Chi, Jinshu
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Chipeaux, Christophe
INRAE
Cremonese, Edoardo
Regional Environmental Protection Agency - Italy
Cuntz, Matthias
Universite de Lorraine
Dusek, Jiri
Global Change Research Centre of the Czech Academy of Sciences
El-Madany, Tarek S.
Max Planck Society
Fares, Silvano
Consiglio Nazionale delle Ricerche (CNR)
Fischer, Milan
Global Change Research Centre of the Czech Academy of Sciences
Foltynova, Lenka
Global Change Research Centre of the Czech Academy of Sciences
Gharun, Mana
ETH Zurich
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Sustainable Development Goals

SDG6 Clean water
SDG13 Climate action

UKÄ Subject classification

Environmental Sciences
Meteorology and Atmospheric Sciences

Publication Identifiers

DOI: https://doi.org/10.1098/rstb.2019.0524

URI (permanent link to this page)

https://res.slu.se/id/publ/107350