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The occurrence of lead in Antarctic recent snow, firn deposited over the last two centuries and prehistoric ice

Boutron, Claude F. and Patterson, Clair C. (1983) The occurrence of lead in Antarctic recent snow, firn deposited over the last two centuries and prehistoric ice. Geochimica et Cosmochimica Acta, 47 (8). pp. 1355-1368. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20140812-085655025

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Abstract

Concentrations of lead have been measured by ultraclean Isotope Dilution Mass Spectrometry in snow cores covering the last two centuries collected at an inland site in East Antarctica using an ultra clean all plastic hand operated auger and in a prehistoric blue ice block collected at an Antarctic coastal site. Lead contamination of 16 to 200 pg Pb/g existed on the outside of the snow cores, but the measured concentrations decreased more or less abruptly along a radius from the outside to the centers of the snow cores, establishing interior values in the 1 to 5 pg Pb/g range. Some of these interior values are however possibly still slightly affected by lead contamination which could have intruded to the center of the cores because of slight melting of some of the snow cores before laboratory analysis. The interior of the blue ice block appears not to have been significantly contaminated, and contains about 1.7 pg Pb/g. These new data show that most previously published data on lead in Antarctic snow and ice were in high positive error because of contamination during field sampling, laboratory analysis or both. They show that lead concentrations could not have increased in Antarctic snows or ice from prehistoric times to present more than 2 to 3 fold, confirming that the remote polar areas of the Southern Hemisphere are still little affected by industrial lead pollution. Prehistoric Antarctic ice is shown to contain about 1 pg Pb/g natural excess lead above silicate dust lead; this excess cannot be entirely accounted for by volcanoes or sea spray, which suggests the possible existence of some other unknown natural source of prehistoric excess lead. Present day mean eolian fallout flux of lead in Antarctica is estimated to be about 0.07 ng Pb cm^(−2) yr^(−1), which stands in about the same proportion to that in the South Pacific Westerlies (about 1:30) as the flux in Greenland is observed to stand to those in the North Pacific and North Atlantic Westerlies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-7037(83)90294-6DOIArticle
http://www.sciencedirect.com/science/article/pii/0016703783902946PublisherArticle
Additional Information:© 1983 Elsevier Ltd. Received January 6, 1983; accepted in revised form April 19, 1983. We are grateful to M. Creseveur and A. Manouvrier for aid in Antarctic field collection, and to D. Settle and R. Flegal for advice and help during laboratory analysis. One of us (CB) is grateful to NATO for a grant for a six months stay at California Institute of Technology as a Visiting Research Associate. This work was supported in France by the Ministere de l'Environment, the INAG, the Expeditions Polaires Francaises ad the Terre Australe et Antarctique Francaises, and in the US by NSF grant DPP 8117250.
Funders:
Funding AgencyGrant Number
NATOUNSPECIFIED
Ministère de l'EnvironnementUNSPECIFIED
INAGUNSPECIFIED
Expeditions Polaires FrancaisesUNSPECIFIED
Terre Australe et Antarctique FrancaisesUNSPECIFIED
NSFDPP 8117250
Issue or Number:8
Record Number:CaltechAUTHORS:20140812-085655025
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140812-085655025
Official Citation:Boutron, C. F., & Patterson, C. C. (1983). The occurrence of lead in Antarctic recent snow, firn deposited over the last two centuries and prehistoric ice. Geochimica et Cosmochimica Acta, 47(8), 1355-1368. doi: http://dx.doi.org/10.1016/0016-7037(83)90294-6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48373
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:12 Aug 2014 18:32
Last Modified:03 Oct 2019 07:03

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