Elemental composition of particulate material sampled from the Arctic haze aerosol |
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| Authors: | Patrick J Sheridan William H Zoller |
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| Institution: | (1) Department of Chemistry, University of Maryland, 20742 College Park, MD;(2) Present address: Research Associate, Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80309 Boulder, CO;(3) Department of Chemistry, University of Washington, 98195 Seattle, WA |
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| Abstract: | Thirty-six aerosol filter samples collected in tropospheric Arctic haze layers, in the stratosphere, and in the marine boundary layer during the 1983 Arctic Gas and Aerosol Sampling Program were analyzed for trace elements using instrumental neutron activation analysis. Average crustal dust concentrations were 540 ng/m3 and 330 ng/m3 for samples collected in Arctic haze over the North American and Norwegian Arctic, respectively. An average marine salt concentration of 120 ng/m3 was obtained for haze samples collected above the marine boundary layer on both sides of the Arctic.Meteorological and wind trajectory information were used to identify specific haze transport pathways, which brought relatively unmixed aerosol from the central Soviet Union into the AGASP sampling areas. Results from individual filters collected within these transport zones are discussed, with emphasis on certain trace metal ratos which have been proposed by other researchers as discriminators of aerosols from different source regions. Our aircraft-collected data are compared with previously-collected ground-based measurements, and show reasonably good agreement for most tracer elements and ratios. Specifically, we have determined the As/Sb ratio tracer, named by other researchers as the most effective elemental discriminator of aerosol from the central Soviet Union, to be approximately 5–6. This relatively high tracer value is consistent with previous ground-based findings. A significantly lower V/Sb ratio was observed throughout this study, possibly indicating a change in the source signature. |
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| Keywords: | AGASP aircraft sampling particulate material Arctic aerosol(s) bulk aerosol chemistry instrumental neutron activation analysis (INAA) |
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