EVALUATION OF A SURFACE-RESISTANCE PARAMETRIZATION OF SULFUR-DIOXIDE

A surface resistance parametrization for the deposition of SO2 is eval uated using long-term measurements of SO2 deposition over a deciduous forest, a coniferous forest, a grassland and a heathland. The parametr ization was found to yield V-d values generally in good agreement with the observations, the best agreement being for the coniferous forest and the heathland (more than 40% of variance accounted for). For these two types of vegetation no systematic bias was found in the parametri zation. The agreement of measured and modelled values for the deciduou s forest is probably influenced by errors in the measurements. For the grassland an underestimation of the time the surface was wet was foun d to be the cause for the disagreement between modelled and measured v alues during dry conditions. The parametrization is demonstrated to be representative for the Netherlands and can probably be adapted for mu ch of Europe.