Daily CO2 flux estimates over Europe from continuous atmospheric measurements: 1, inverse methodology
*Experimentalists that contributed to the atmospheric measurements: A. Adolphsen, F. Apadula, R. Graul, L. Haszpra, M. Ramonet, R. Santaguida, M. Schmidt
1Laboratoire de Biogéochimie isotopique, CNRS-UPMC-INRA, Paris, France
2CSIRO Atmospheric Research, Aspendale, Victoria, Australia
3Laboratoire des Sciences du Climat et de l’Environnement, CEA, Gif-sur-Yvette, France
4Laboratoire de Météorologie Dynamique, CNRS, Paris, France
5Laboratoire DASE/LDG, CEA, Bruyeres-le-Chatel, France
Abstract. This paper presents an inverse method for inferring trace gas fluxes at high temporal (daily) and spatial (model grid) resolution from continuous atmospheric concentration measurements. The method is designed for regional applications and for use in intensive campaigns. We apply the method to a one month inversion of fluxes over Europe. We show that the information added by the measurements depends critically on the smoothness constraint assumed among the source components. We show that the initial condition affects the inversion for 20 days, provided one has enough observing sites to constrain regional fluxes. We show that the impact of the far-field fluxes grows throughout the inversion and hence a reasonable global flux field is a prerequisite for a regional inversion.