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This paper aims at presenting a model-to-data comparison of the AerosolOptical Thickness (AOT) and of a few sparse data for Single ScatteringAlbedo (SSA) over Europe for one year. The main contribution of this paperis the sensitivity study to a large number of parameters, including physicaland numerical parameters of the aerosol model itself. The optical parametersare computed from a size-resolved aerosol model embedded in the Polyphemussystem. The methodology is first described, showing that several hypothesiscan be made for micro-physical aerosol properties. The simulation is madeover one year (2001); statistics and monthly time series for the simulationand AERONET data are used to evaluate the ability of the model to reproduceAOT and vertically averaged SSA fields and their variability. The relationwith the uncertainties of measurements is discussed. Then a sensitivity studywith respect to the mixing state of the particle, the way to take into accountwater uptake, numerical parameters and physical parameterizations of themodel is carried out. The results indicate that the mixing state of particleshas an influence on optical parameters, as well as the computation of the wetdiameter. But some physical and numerical parameters associated with theaerosol model itself have even more influence under certain conditions,through the uncertainties on the aerosol chemical composition, and their size distribution

Simulation of aerosol optical properties over Europe with a 3-D size-resolved aerosol model: comparisons with AERONET data