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Vertical profiles of CO2 concentration were collected during anintensive summer campaign in a coastal complex-terrain region within theframe of the European Project RECAB (Regional Assessment and Modelling ofthe Carbon Balance in Europe). The region presents marked diurnal mesoscalecirculation patterns. These circulations result in a specific couplingbetween atmospherically transported CO2 and its surface fluxes. Tounderstand the effects of this interaction on the spatial variability of theobserved CO2 concentrations, we applied a high-resolution transportsimulation to an idealized model of land biotic fluxes. The regional NetEcosystem Exchange fluxes were extrapolated for different land-use classesby using a set of eddy-covariance measurements. The atmospheric transportmodel is a Lagrangian particle dispersion model, driven by a simulation ofthe RAMS mesoscale model. Our simulations were able to successfullyreproduce some of the processes controlling the mesoscale transport ofCO2. A semi-quantitative comparison between simulations and dataallowed us to characterize how the coupling between mesoscale transport andsurface fluxes produced CO2 spatial gradients in the domain. Temporalaverages in the simulated CO2 field show a covariance between flux andtransport consisting of: 1) horizontally, a CO2 deficit over land,mirrored by a CO2 excess over the sea and 2) vertically, the prevalenceof a mean CO2 depletion between 500 and 2000 m, and a permanentbuild-up of CO2 in the lower levels

atmospheric chemistry and physics

Mesoscale circulations over complex terrain in the Valencia coastal region, Spain – Part 2: Modeling CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; transport using idealized surface fluxes