Daily CO₂ flux estimates over Europe from continuous atmospheric measurements: 1, inverse methodology

P. Peylin (1) , P. J. Rayner (2, 3) , Philippe Bousquet (3, 4) , C. Carouge (3) , F. Hourdin (5) , P. Heinrich (6) , Philippe Ciais (3, 7)

1 Bioemco - Biogéochimie et écologie des milieux continentaux
2 CSIRO Atmospheric Research
3 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
4 SATINV - Modélisation INVerse pour les mesures atmosphériques et SATellitaires
5 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
6 DAM/DIF - DAM Île-de-France
7 ICOS-ATC - ICOS-ATC

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.

Mots clés: FREQUENCY DATA; CARBON DIOXIDE; GENERAL CIRCULATION MODEL; MACE HEAD; TRANSPORT; EMISSIONS; DELTA-C-13; IRELAND; SCHEME; CYCLE

Domaines: Océan, Atmosphère

P. Peylin, P. J. Rayner, Philippe Bousquet, C. Carouge, F. Hourdin, et al.. Daily CO₂ flux estimates over Europe from continuous atmospheric measurements: 1, inverse methodology. Atmospheric Chemistry and Physics, 2005, 5 (12), pp.3173-3186. ⟨10.5194/acp-5-3173-2005⟩. ⟨hal-00328413⟩