REGIONAL ATMOSPHERIC DEPOSITION PATTERNS OF AG, AS, BI, CD, HG, MO, SB AND TL IN A 188,000 KM(2) AREA IN THE EUROPEAN ARCTIC AS DISPLAYED BY TERRESTRIAL MOSS SAMPLES - LONG-RANGE ATMOSPHERIC TRANSPORT VS LOCAL-IMPACT

The regional atmospheric deposition patterns of Ag, As, Bi, Cd, Hg, Mo , Sb and Tl have been mapped in a 188,000 km(2) area of the European A rctic (N Finland, N Norway, NW Russia) using the moss technique. The R ussian nickel mining and smelting industry (Nikel and Zapoljarnij (Pec henganikel) and Monchegorsk (Severonikel)) in the eastern part of the survey area represents two of the largest point sources for SO, and me tal emissions on a world wide basis. In contrast, parts of northern Fi nland and northern Norway represent still some of the most pristine ar eas in Europe. The terrestrial mosses Hylocomium splendens and Pleuroz ium schreberi were used as monitors of airborne deposition. Samples in all three countries were collected during the summer of 1995 and anal ysed in one laboratory using ICP-MS. Maps for most elements clearly sh ow elevated element concentrations near the industrial sites and delin eate the extent of contamination. Pollution follows the main wind and topographical directions in the area (N-S). The gradients of depositio n are rather steep. Background levels for all the elements are reached within 150-200 km from the industrial plants. The relative importance of long-range atmospheric transport of air pollutants from industrial point sources on the world wide increase of heavy metals observed in the atmosphere is thus debatable for many elements. Increasing populat ion and traffic density, accompanied by increasing local dust levels, may play a much more important role than industrial emissions. The reg ional distribution patterns as displayed in the maps show some strikin g differences between the elements. The regional distribution of Hg an d TI in the survey area is completely dominated by sources other than industry. (C) 1997 Elsevier Science Ltd.