ATMOSPHERIC AEROSOL STUDIES IN SOUTHERN NORWAY USING SIZE-FRACTIONATING SAMPLING DEVICES AND NUCLEAR ANALYTICAL TECHNIQUES

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Multi-elemental composition and sources of the high Arctic atmospheric aerosol during summer and autumn

During the International Arctic Ocean Expedition 1991 (IAOE-91), total (i.e., 2 mu m EAD) size fraction. The highest levels of the anthropogenic metals and of the mineral dust elements were found in air which in general had not been in contact with large continental or anthropogenic source regions during the last 5 or even 10 days prior to its arrival, and in an area of the pack ice which was influenced by continental river run-of from the Siberian coast. It is tentatively suggested that the elevated concentrations of both those metals and the crustal elements were the result of local mechanical windblown generation of coarse aerosols from the river effluent materials which were present on or at the surface of the ice. By relating the observed atmospheric nss-S levels to 3-dimensional air back trajectories, and from intercomparing the nss-S time trend with the trends of various other particulate species, it was concluded that the nss-S was mainly from anthropogenic origin (transported through the free troposphere) near the end of the IAOE-91, but that the marine biogenic sulfur source must have dominated during the first month and a half of the expedition