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Michal Heliasz. Photo.

Michal Heliasz

Research engineer

Michal Heliasz. Photo.

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


  • 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
  • Meelis Mölder
  • Mats Nilsson
  • Harry Vereecken

Summary, in English

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'.


  • Dept of Physical Geography and Ecosystem Science
  • Centre for Environmental and Climate Science (CEC)
  • ICOS Sweden

Publishing year





Philosophical Transactions of the Royal Society B: Biological Sciences





Document type

Journal article


Royal Society Publishing


  • Physical Geography


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




  • ISSN: 0962-8436