EGU23-14228, updated on 09 Oct 2023
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Responses of European forest fluxes to the 2022 heatwave and drought recorded by ICOS Eddy-covariance stations

Emilie Joetzjer1, Sebastien Lafont2, Benjamin Loubet3, Gabriel Destouet1, Adrien Jacotot4, Matthias Cuntz1, Philippe Ciais5, Zheng Fu5, Pedro Herig-Coimbra3, Jean-Christophe Domec2, and Denis Lousteau2
Emilie Joetzjer et al.
  • 1INRAE UMR SILVA 1434 (INRAE/ Université de Lorraine / AgroParisTech), France
  • 2INRAE, unité ISPA UMR 1391, France
  • 3INRAe, UMR INRAe-AgroParisTech ECOSYS Université Paris-Saclay, France
  • 4INRAE, UMR 1069 Sol, Agro et hydrosystèmes, Spatialisation (SAS), France
  • 5IPSL - Laboratoire des Sciences du Climat et de l'Environnement

In 2022, Europe experienced a widespread severe summer edaphic drought and heat event, as well as abnormally hot autumn temperatures. By contrasting year 2022 with previous ones and using high-frequency Eddy-covariance and meteorological monitoring from 16 ecosystem ICOS forest stations across Europe, we(i) characterized the impact on carbon uptake and evapotranspiration rates, and (ii) disentangled the effects of soil water deficit from effects of atmospheric dryness on the forest fluxes.

Reduction of observed CO2 uptake and evapotranspiration varied across Europe relative to drought intensity. Scandinavian forests were minimally affected in 2022, unlike the 2018 drought. On the contrary, several sites in southern Europe became a carbon source during the 2022 drought. Specifically, in southern France, some sites experienced a reduction of GPP of up to 70% relative to 2015-2021. Using artificial neural networks to analyze the responses of forests' CO2 uptake to soil water content and atmospheric dryness, showed the very high vapor pressure deficit experienced in 2022 was the major driver of the ecosystem responses in southern France this particular year.  

How to cite: Joetzjer, E., Lafont, S., Loubet, B., Destouet, G., Jacotot, A., Cuntz, M., Ciais, P., Fu, Z., Herig-Coimbra, P., Domec, J.-C., and Lousteau, D.: Responses of European forest fluxes to the 2022 heatwave and drought recorded by ICOS Eddy-covariance stations, EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-14228,, 2023.