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Sulphate distributions were simulated with a global chemistry transportmodel. A chemical scheme describing the sulphur cycle and theparameterisations of the main sinks for sulphate aerosols were included inthe model. A six-year simulation was conducted from the years 2000 to 2005,driven by the ECMWF operational analyses. Emissions come from an inventoryrepresentative of the year 2000. This paper focuses on the analysis of thesulphate sinks and sources over Europe for the entire period of simulation.The Sulphate burden shows a marked annual cycle, which is the result of theannual variations of the aqueous and gaseous chemistry. Regionally, themonthly mean aerosol burden can vary by a factor of 2 from one year toanother, because of different weather conditions, driving chemistry,transport and wet deposition of sulphate aerosols. Sulphate groundconcentrations, scavenging fluxes and precipitation modelled were comparedwith observations. The model represents quite well sulphate fields overEurope, but has a general tendency to overestimate sulphate groundconcentrations, in particular over Northern Europe. We assume that it islinked to the representation of the scavenging fluxes, which areunderestimated. We suggest that uncertainties in modelled precipitationexplain only partially the underestimation of the scavenging fluxes in themodel

Equilibrium of sinks and sources of sulphate over Europe: comparison between a six-year simulation and EMEP observations