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A number of attempts have been made to incorporate sea-salt aerosol(SSA) source functions in chemistry transport models with varyingresults according to the complexity of the scheme considered. Thiscontribution compares the inclusion of two different SSA algorithms intwo chemistry transport models: CMAQ and CHIMERE. The main goal is toexamine the differences in average SSA mass and composition and tostudy the seasonality of the prediction of SSA when applied to theMediterranean area with high resolution for a reference year. Dry andwet deposition schemes are also analyzed to better understand thedifferences observed between both models in the target area. Theapplied emission algorithm in CHIMERE uses a semi-empiricalformulation which obtains the surface emission rate of SSA asa function of the particle size and the surface wind speed raised to the power 3.41. Theemission parameterization included within CMAQ is somehow moresophisticated, since fluxes of SSA are corrected with relativehumidity. In order to evaluate their strengths and weaknesses, theparticipating algorithms as implemented in the chemistry transportmodels were evaluated against AOD measurements from Aeronet andavailable surface measurements in Southern Europe and theMediterranean area, showing biases around −0.002 and−1.2 μg m−3, respectively. The results indicatethat both models represent accurately the patterns and dynamics of SSAand its non-uniform behavior in the Mediterranean basin, showinga strong seasonality. The levels of SSA strongly vary across theWestern and the Eastern Mediterranean, reproducing CHIMERE higherannual levels in the Aegean Sea (12 μg m−3) andCMAQ in the Gulf of Lion (9 μg m−3). The largedifference found for the ratio PM2.5/total SSA in CMAQ andCHIMERE is also investigated. The dry and wet removal rates are verysimilar for both models despite the different schemes implemented. Drydeposition essentially follows the surface drag stress patterns,meanwhile wet deposition is more scattered over the continent. CMAQtends to provide larger amounts of SSA dry deposition over theNorthern Mediterranean (0.7–1.0 g m−2 yr−1), meanwhilethe Southeastern Mediterranean accounts for the maximum annual drydeposition in the CHIMERE model(0.9–1.5 g m−2 yr−1). The wet deposition is dominatedby the accumulation mode and is strongly correlated to theprecipitation patterns, showing CMAQ a higher wet deposition/totaldeposition ratio over coastal mountain chains. The results of bothmodels constitute a step towards increasing the understanding of theSSA dynamics in a complex area as the Mediterranean

Comparison of two different sea-salt aerosol schemes as implemented in air quality models applied to the Mediterranean Basin