The EU funded RECAB project aims to understand the main controlling factors determining carbon dioxide content in the atmospheric boundary layer at the mesoscale within representative areas in Europe, using a combination of experimental, forward and inverse modelling tools.

Campaign wise observations have been made of: - exchange fluxes of CO2 between land and atmosphere deploying a number of permanent and mobile eddy-correlation fluxtowers, as well as an low-flying eddy-correlation flux aircraft - ABL concentrations of CO2 and other greenhouse gases, deploying flask-sampling from aircraft, and continuous sampling from tall towers - general ABL dynamics using RASS-SODAR and tall tower observations

We will present first analysis of results from one such (winter) campaign in the Netherlands, compare these to results from similar campaigns in other parts of Europe, and interpret these results in a RAMS modelling framework.