Chemistry of polar snows. Estimation of rates of deposition in Antarctica

Details Chemistry of polar snows. Estimation of rates of deposition in Antarctica Chemistry of polar snows. Estimation of rates of deposition in Antarctica

Sep 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1029b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 9, pp.1029-1041

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Scientific paper

In this study, we report analyses of chlorine, sodium, magnesium, potassium, calcium, manganese and iron in ten surface firn samples collected along the profile Mirny (66°30'S, 93°E, near the sea)-Vostok (78°27'S, 107°E, 1295 km from the sea, altitude 3420 m) in Antarctica, and brought back to the laboratory in the frozen state. The analyses were carried out by atomic absorption after preconcentration in the presence of aqua regia and HF (Na, Mg, K, Ca and Fe) and neutron activation in the frozen state (Cl, Na and Mn). Measured concentrations (from 140 ppb for Cl to 0.1 ppb for Mn) are in good agreement with those published recently by et al. (1969), (1970) and (1971) for other antarctic locations (in this paper, the symbol ppb means 10 -9 g/g). Data published by (1961, 1962, 1964, 1970) for the axis Mirny-Vostok are, on the other hand, much higher than ours. Cl and Na concentrations are shown to decrease as the distance from the coast increases and then to increase toward the central areas of Antarctica. We do not find systematic variations for the other elements. Except near the coast, observed concentrations could be related to a &;fractionated' marine contribution, but a noticeable influence of a continental contribution could not, in fact, be discarded. The annual elemental deposition rates decrease from the coast to Vostok. The observed relation between these rates and accumulation rates enables us to give an estimation of fallout on the entire Antarctic continent for six elements; the fallout rates vary between 200 × 10 3 tons/yrfor Cl and 0.3 × 10 3 tons/yr for Mn.

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