4.7 Article

Spatial variations of surface snow chemistry during two austral summers in western Dronning Maud Land, Antarctica

Journal

ATMOSPHERIC ENVIRONMENT
Volume 39, Issue 8, Pages 1405-1416

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2004.11.027

Keywords

Antarctica; snow; ionic concentrations; pH; contribution of dry deposition

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The glaciochemical properties of snow were measured in western Dronning Maud Land during the austral summers of 1999/2000 and 2000/2001. The surface snow samples were taken along a 350-km transect from the seaward edge of the ice shelf to the Antarctic plateau and analysed for the presence of the major inorganic components SO2/(-)(4), NO3-, Cl-, NH4+, Na+, K+, Ca2+, Mg2+ and MSA. The sea-salt components and MSA decreased exponentially with increasing distance from the coast by about 64%/100 km. Non-sea-salt SO2/(-)(4) decreased also exponentially with the distance from the ice edge by 48%/100km. No substantial trend was observed for N03. The pH values calculated from the ionic balance were similar to those measured in the field, although the calculated pH values were an average of 0.6 lower. The fractions of the dry deposition of the ionic concentrations were estimated and the results reveal that they are low near the Finnish research station Aboa, usually less than 10% of the total deposition. (c) 2004 Elsevier Ltd. All rights reserved.

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