Sulphur in the Arctic environment (1): results of a catchment-based multi-medium study

S-concentrations were determined in 9 different sample materials (precipita tion train and snow), vegetation, O-, E-, B- and C-horizon of podzols, stre am water and ground water) collected in eight small catchments (10-30 km(2) ) at different distances from major SO2 point-source emitters on the Kola P eninsula, Russia. Comparison of the results from these materials, represent ing different compartments of the ecosystem under varying natural condition s leads to a better understanding of sources, cycling and fate of S in the Arctic environment. More than 300,000 t of SO2 emitted annually from the Ko la smelters affect the air quality over a large area. Arctic climatic condi tions (cold and dry) and the remote location of the emitters result in cons iderably lower S-deposition values than those observed in central Europe. T he pathways of atmospheric S-deposition in the terrestrial environment vary significantly from summer to winter because different compartments of the ecosystem, with a different capability to accumulate S, are active. The act ual S-flux is altered by every component of the ecosystem. When estimating the total S-deposition this effect must be considered. (C) 2001 Elsevier Sc ience Ltd. All rights reserved.