COMPARISON OF MEASUREMENTS AND MODEL RESULTS FOR AIRBORNE SULFUR AND NITROGEN COMPONENTS WITH KRIGING

Comparisons have been made between calculations from the Lagrangian mo del for acid deposition at Meteorological Synthesizing Centre-West (MS C-W) of EMEP and measurements at EMEP sites. Annual averages of aeroso l sulphate, sulphate in precipitation and nitrate in precipitation wer e calculated and compared for selected sites. Site selection was based on data completeness and on results from EMEP interlaboratory exercis es. The comparison for sulphates in precipitation and air led to a mod el underestimation in the north and model overestimation in a belt thr ough the major source regions in central Europe. The comparisons also indicate irregularities at some sites which may be due to influence fr om local sources, or the data quality, although this is not substantia ted. The model estimates of nitrate in precipitation compare well with the measurements, although some characteristic differences occur also for this component.