Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 1 2009 10.5194/bg-6-113-2009 http://www.biogeosciences.net/6/113/2009/ http://www.biogeosciences.net/6/113/2009/bg-6-113-2009.html http://www.biogeosciences.net/6/113/2009/bg-6-113-2009.pdf 113 127 2009-01-22 CO₂ budgeting at the regional scale using a Lagrangian experimental strategy and meso-scale modeling C. Sarrat claire.sarrat@cnrm.meteo.fr J. Noilhan P. Lacarrère V. Masson E. Ceschia P. Ciais A. Dolman J. Elbers C. Gerbig N. Jarosz CNRM-GAME, Météo France, 42 avenue Coriolis, 31057 Toulouse, France CESBIO, 8 av. E. Belin, 31401 Toulouse, France LSCE, CEA/Saclay, 91191 Gif-sur-Yvette, France Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands ALTERRA, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands Max Planck Institute for Biogeochemistry, Hans-Knoell-Str. 10, 07745 Jena, Germany INRA, B. P. 81, 33883 Villenave d'Ornon, France now at: CESBIO, 8 av. E. Belin, 31401 Toulouse, France An atmospheric Lagrangian experiment for regional CO₂ budgeting with aircraft measurements took place during the CarboEurope Regional Experiment Strategy campaign (CERES) in south-west France, in June 2005. The atmospheric CO₂ aircraft measurements taken upstream and downstream of an active and homogeneous pine forest revealed a CO₂ depletion in the same air mass, using a Lagrangian strategy. This field experiment was analyzed with a meteorological meso-scale model interactively coupled with a surface scheme, with plant assimilation, ecosystem respiration, anthropogenic CO₂ emissions and sea fluxes. First, the model was carefully validated against observations made close to the surface and in the atmospheric boundary layer. Then, the carbon budget was evaluated using the numerous CERES observations, by upscaling the surface fluxes observations, and using the modeling results, in order to estimate the relative contribution of each physical process. <br><br> A good agreement is found between the two methods which use the same vegetation map: the estimation of the regional CO₂ surface flux by the Eulerian meso-scale model budget is close to the budget deduced from the upscaling of the observed surface fluxes, and found a budget between &minus;9.4 and &minus;12.1 μmol.m^&minus;2.s^&minus;1, depending on the size of the considered area. Nevertheless, the associated uncertainties are rather large for the upscaling method and reach 50%. A third method, using Lagrangian observations of CO₂ estimates a regional CO₂ budget a few different and more scattered, (&minus;16.8 μmol.m^&minus;2.s^&minus;1 for the small sub-domain and &minus;8.6 μmol.m^&minus;2.s^&minus;1 for the larger one). 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