Calculation of sulphur and nitrogen deposition with the frame model and assessment of the exceedance of critical loads in Poland

Sulphur and nitrogen deposition are caluclated with the FRAME model ad used to calculate the exceedances of the critical loads of acidity and eutrophication in Poland. For the first time two tools: the FRAME and SONOX models are used jointly to provide information on ecosystems at risk. The FRAME model is in close agreement with available sulphur and nitrogen wet deposition measurements. Total mass of sulphur deposited in Poland in year 2008 is 292 Gg S. Total deposition of nitrogen (oxidized + reduced) is 389 Gg N. 11% of the ecosystems in Poland are at risk of acidification due to deposition of sulphur and nitrogen. In case of eutrophication, over 95% of terrestrial ecosystems are at risk due to large deposition of nitrogen compounds.