Inland transport of marine aerosols in southern Sweden

The transport of marine aerosols across southern Sweden was studied using s ix meteorological stations in a transect from west- to east-coast. Measurem ents were made during dry westerlies on 10 occasions during 1995. The conce ntration and flux of salt in the air was measured using "salt vanes". It is concluded that marine salt is transported along the whole transect at all occasions and that the concentration and flux of salt decrease with downwin d distance from the coast as an inversed power function. The two easternmos t stations show a slight:increase rewards the east-coast. Variability of th e data is high on the west coast due to strong influence from the coastal p roduction of aerosols. This effect diminishes along downwind forming lower, less variable concentration further inland. Statistical models based on th e data are in relatively good agreement with previous models and data. Furt her, salt content on Scots Pine (Pinus sylvestris, L) needles after two wes terly gale occasions, in profiles from west- to east-coast, were analysed. The Cl-/Na+, Ca2+/Na+, K+/Na+, Mg2+/Na+ and SO42-/Na+ ratios were studied r evealing a clear downwind decrease in Ca2+/Na+ and Mg2+/Na+, a close to sea water ratio for Cl-/Na+ and an excess of SO42- along the profile. Also, th e importance of degree of along the profile. Also, the importance of degree of exposure was studied concluding that the roughness of the upwind surfac e is an important factor for the deposition onto trees in:forest edges. (C) 1999 Elsevier Science Ltd. All rights reserved.