| Summary: | Concentrations of lead have been measured by ultraclean isotope dilution mass spectrometry in large blocks of surface snow collected along a 433-km coast-interior axis in East Antarctica and near the geographic south pole. Slight contamination existed on the outside of the blocks, but concentration profiles from their exteriors to their interiors indicate that lead concentrations in the innermost parts of the blocks do represent the original concentrations in present-day Antarctic snow. Geographical variations of lead concentrations appear to be mainly due to local emissions from Dumont d'Urville and Amundsen Scott stations. The globally significant lead concentration in present-day Antarctic snow is found to be about 2 pg Pb/g. The corresponding value in Antarctic air is estimated to be about 7 pg Pb/m^3 STP, which is approximately fivefold larger than total natural lead contributed by soil dusts, volcanoes and sea salts. A tentative temporal curve of globally significant lead concentrations in Antarctic ice and snow for the last 13,000 years is given. It shows concentrations of about 0.4 pg Pb/g throughout most of the Holocene, with recent fivefold increases to about 2 pg Pb/g today. The general picture is then that four-fifths of total lead in the Antarctic troposphere today is anthropogenic. © 1987 by the American Geophysical Union. Received December 17, 1986; revised April 20, 1987; accepted April 21, 1987. Paper number D0397. We thank M. Legrand, J. R. Petit and M. Pourchet for field sample collection and D. Settle for advice and help during laboratory analysis. The manuscript was prepared by M. Poinsot. This work was supported in the United States by NSF grant DPP-8403490, and in France by the Centre National de la Recherche Scientifique, the Ministère de l'Environnement, the Expéditions Polaires Françaises, and the Terres Australes et Antarctiques Françaises. Reprint requests should be addressed to C. F. Boutron at St. Martin d'Heres, France. Contribution 4426, Division of Geological and Planetary ...
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