MAPPING BASE CATION DEPOSITION IN EUROPE ON A 10X20 KM GRID

Atmospheric deposition of base cations in Europe is mapped on a 10x20 km grid using the inferential modeling technique. Deposition fields ar e found to resemble the geographic variability of sources, climate and land use. In large parts of southern Europe, more than 50% of the pot ential acid deposition is found counteracted by deposition of base cat ions. In central and northwestern Europe, however, base cation deposit ion usually amounts less than 25% of the acid input An uncertainty ana lysis to assess the quality of the base cation deposition maps reveale d that for an average grid cell the deviation from the estimated value can be as large as 140%.