Atmospheric CO2 Modeling at the Regional Scale Applied to the CarboEurope Regional Experiment, April 2007.

The study describes a numerical interpretation of the April, 2007 CERES campaign, South-West of France, devoted to the CO2 cycle at the regional scale. Four consecutive days with intensive observations of CO2 and fluxes at the surface and in the boundary layer have been simulated with the MesoNH mesoscale model. Aircraft observations of CO2 at low level have been used to identify surface modelling errors and to calibrate the CO2 components of the land surface scheme used in Meso-NH. After this calibration, a systematic comparison of the model outputs with all the data collected during Ceres, April 2007 is provided. As a conclusion, an example of CO2 budgeting from the meso-scale model is given.