Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 3 3 2006 10.5194/bg-3-337-2006 http://www.biogeosciences.net/3/337/2006/ http://www.biogeosciences.net/3/337/2006/bg-3-337-2006.html http://www.biogeosciences.net/3/337/2006/bg-3-337-2006.pdf 337 355 2006-07-21 Comparison of modelled and monitored deposition fluxes of sulphur and nitrogen to ICP-forest sites in Europe D. Simpson david.simpson@met.no H. Fagerli S. Hellsten J. C. Knulst O. Westling EMEP MSC-W, Norwegian Meteorological Institute, Oslo, Norway IVL Swedish Environmental Research Institute, P.O. Box 5302, 400 14 Gothenburg, Sweden Dept. Radio & Space Science, Chalmers University of Technology, Gothenburg, Sweden The EMEP MSC-W Eulerian chemical transport model, and its predictions of deposition of acidifying and eutrophying pollutants over Europe, play a key role in the development of emission control strategies for Europe. It is important that this model is tested against observational data. Here we compare the results of the EMEP model with measured data from 160 sites of the European Union/ICP Forest (Level II) monitoring network, for the years 1997 and 2000. This comparison comprises: (a) Precipitation amount, (b) Total deposition of SO2−4 to coniferous and deciduous forests, (c) Wet deposition of SO2−4, NO3− and NH4+ in open field sites, and (d) Concentrations of SO2−4, NO3− and NH4+ in precipitation. Concerning precipitation, the EMEP model and ICP network showed very similar overall levels (within 4% for 1997 and 11% for 2000). The correlation was, however, poor (r2=0.15–0.23). This can be attributed largely to the influence of a few outliers, combined with a small range of rainfall amounts for most points. Correlations between modelled and observed deposition values in this study were rather high (r2 values between 0.4–0.8 for most components and years), with mean values across all sites being within 30%. 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