Author:
Udisti R.,Becagli S.,Traversi R.,Vermigli S.,Piccardi G.
Abstract
An ion chromatographic method for the determination of fluoride and some
organic anions (lactate, acetate, glycolate, propionate, formate, methane
sulphonate and pyruvate) at sub-μgl−1 concentration levels is
applied to a 22 m (63 years) firn core drilled at Hercules Névé, northern Victoria
Land, Antarctica. The first effective distribution data of acetate, propionate and
formate for this region are reponed here. Mean values of 9.9,7.7 and 2.4
μgl−1 were calculated for acetate, Formate and propionate,
respectively, in the absence of particular events (background values).
The temporal (1928-82) concentration/depth profiles of these components
showed a probable long-term biomass-burning event in the 1930s that can be related
back to processes in the Southern Hemisphere. Such burning events may be
demonstrated from the simultaneous concentration increase of carboxylic acid,
potassium, ammonium and fluoride and from a very high dust content. Similar
increasing trends in the same time period are not shown by other snow components
usually considered as source indicators (methane sulphonic acid: biogenic marker;
nssSO4
2- : biogenic and volcanic indicator;
Na+ and Cl−: sea-spray contribution;
Ca2+ : crustal input), so it was possible to exclude such
alternative explanations.
Publisher
International Glaciological Society
Cited by
7 articles.
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