Atmos. Chem. Phys., 10, 3107-3117, 2010
www.atmos-chem-phys.net/10/3107/2010/
doi:10.5194/acp-10-3107-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
What can we learn from European continuous atmospheric CO2 measurements to quantify regional fluxes – Part 1: Potential of the 2001 network
C. Carouge1, P. Bousquet1,2, P. Peylin1,3, P. J. Rayner1, and P. Ciais1
1Laboratoire des Sciences du Climat et de l'Environnement, UMR1572 CNRS-CEA-UVSQ, Bât. 701, Orme des Merisiers, 91191 Gif-sur-Yvette, France
2Université de Versailles Saint-Quentin en Yvelines, Versailles, France
3Laboratoire de Biogéochimie et Ecologie des Milieux Continentaux, CNRS-UPMC-INRA, Paris, France

Abstract. An inverse model using atmospheric CO2 observations from a European network of stations to reconstruct daily CO2 fluxes and their uncertainties over Europe at 40 km resolution has been developed within a Bayesian framework. In this first part, a pseudo-data experiment is performed to assess the potential of continuous measurements over Europe using a network of 10 stations of the AEROCARB project such as in 2001 (http://www.aerocarb.cnrs-gif.fr/). Under the assumptions of a small observation noise and a perfect atmospheric transport model, the reconstruction of daily CO2 fluxes and in particular of their synoptic variability is best over Western Europe where the network is the densest. At least a 10 days temporal and a 1000 km spatial averaging of the inverted daily/40 km fluxes is required in order to obtain a good agreement between the estimated and the "true" fluxes in terms of correlation and variability. The performance of the inversion system rapidly degrades when fluxes are sought for a smaller temporal or spatial averaging.

Citation: Carouge, C., Bousquet, P., Peylin, P., Rayner, P. J., and Ciais, P.: What can we learn from European continuous atmospheric CO2 measurements to quantify regional fluxes – Part 1: Potential of the 2001 network, Atmos. Chem. Phys., 10, 3107-3117, doi:10.5194/acp-10-3107-2010, 2010.
 
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