Wet and dry sulphur deposition patterns over Europe for the period 13.12.73-29.3.74

On days with precipitation, a relation is established between mean SO4-concentrations measured in precipitation at some LRTAP-stations and mean SO2-concentrations, calculated with an one-layer Lagrangian dispersion model. The time period on which this relation is based is 107 days, 13th December, 1973 to 29th March, 1974. Using this relation, together with model calculations and the amount of precipitation analysed as fields every 12 hours, we have estimated the wet deposition field of SO4 over Europe for the period. Estimating the dry deposition field of SO2 by the same methode as in ref. (1), and assuming the dry deposition of sulphate particles to be small, we have added dry deposition of SO2 and wet deposition of SO4 to give the calculated total deposition of sulphur. We have compared these estimates with the emissions.