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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 11 Dec 2019

Submitted as: research article | 11 Dec 2019

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This preprint is currently under review for the journal ACP.

The regional EUROpean atmospheric transport inversion COMparison, EUROCOM: first results on European wide terrestrial carbon fluxes for the period 2006–2015

Guillaume Monteil1, Grégoire Broquet2, Marko Scholze1, Matthew Lang2, Ute Karstens3, Christof Gerbig4, Frank-Thomas Koch8,4, Naomi E Smith6, Rona L. Thompson7, Ingrid T. van der Laan-Luijkx6, Emily White5, Antoon Meesters9, Philippe Ciais2, Anita L. Ganesan5, Alistair Manning5, Michael Mischurow1, Wouter Peters10, Philippe Peylin2, Jerôme Tarniewicz2, Matt Rigby5, Christian Rödenbeck4, Alex Vermeulen3, and Evie M. Walton5 Guillaume Monteil et al.
  • 1Dep. of Physical Geography and Ecosystem Science, Lund University, Sweden
  • 2Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France
  • 3ICOS Carbon Portal, Lund University, Sweden
  • 4Max Planck Institute for Biogeochemistry, Jena, Germany
  • 5University of Bristol, Bristol, UK
  • 6Meteorology and Air Quality, Wageningen University and Research, Wageningen, the Netherlands
  • 7NILU – Norsk Institutt for Luftforskning, Kjeller, Norway
  • 8Deutscher Wetterdienst, Germany
  • 9Vrije Universiteit Amsterdam, the Netherlands
  • 10Centre for Isotope Research, University of Groningen, Groningen, the Netherlands

Abstract. Atmospheric inversions have been used for the past two decades to derive large scale constraints on the sources and sinks of CO2 into the atmosphere. The development of high density in-situ surface observation networks, such as ICOS in Europe, enables in theory inversions at a resolution close to the country scale in Europe. This has led to the development of many regional inversion systems capable of assimilating these high-resolution data, in Europe and elsewhere. The EUROCOM project (EUROpean atmospheric transport inversion COMparison) is a collaboration between seven European research institutes, which aims at producing a collective assessment of the net carbon flux between the terrestrial ecosystems and the atmosphere in Europe for the period 2006–2015. It aims in particular at investigating the capacity of the inversions to deliver consistent flux estimates from the country scale up to the continental scale.

The project participants were provided with a common database of in-situ observed CO2 concentrations (including the observation sites that are now part of the ICOS network), and were tasked with providing their best estimate of the net terrestrial carbon flux for that period, and for a large domain covering the entire European Union. The inversion systems differ by the transport model, the inversion approach and the choice of observation and prior constraints, enabling us to widely explore the space of uncertainties.

This paper describes the intercomparison protocol and the participating systems, and it presents the first results from a reference set of inversions, at the continental scale and in four large regions. At the continental scale, the regional inversions support the assumption that European ecosystems are a relatively small sink (−0.21 ± 0.2 PgC/year). We find that the convergence of the regional inversions at this scale is not better than that obtained in state-of-the-art global inversions. However, more robust results are obtained for sub-regions within Europe, and in these areas with dense observational coverage, the objective of delivering robust country scale flux estimates appears achievable in the near future.

Guillaume Monteil et al.

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Status: final response (author comments only)
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Guillaume Monteil et al.

Data sets

EUROCOM ensemble of inversion results for 2006-2015 G. Monteil, G. Broquet, M. Scholze, M. Lang, C. Gerbig, F.-T. Koch, N. Smith, R. Thompson, I. van der Laan-Luijkx, E. White, and A. Meesters

CarbonTrackerEurope inversion results for EUROCOM N. Smith, I. van der Laan-Luijkx, and W. Peters

EnKF-RAMS inversion results for EUROCOM A. Meesters

FLEXINVERT inversion results for EUROCOM R. Thompson

JenaCarboScopeRegional inversion results for EUROCOM F.-T. Koch and C. Gerbig

LUMIA inversion results for EUROCOM G. Monteil

NAME-HB inversion results for EUROCOM E. White, M. Rigby, A. Ganesan, and A. Manning

PYVAR-CHIMERE inversion results for EUROCOM M. Lang and G. Broquet

Guillaume Monteil et al.


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Publications Copernicus
Short summary
The paper presents the first results from the EUROCOM project, a regional atmospheric inversion intercomparison exercise involving six European research groups. It aims at producing an estimate of the net carbon flux between the European terrestrial ecosystems and the atmosphere for the period 2006–2015, based on constraints provided by observed CO2 concentrations, and using inverse modelling technicuqes. The use of six different models enables us to investigate the robustness of the results.
The paper presents the first results from the EUROCOM project, a regional atmospheric inversion...