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Seasonal variability in the input of lead, barium and indium to Law Dome, Antarctica


Burn-Nunes, LJ and Vallelonga, P and Loss, RD and Burton, GR and Moy, AD\ and Curran, M and Hong, S and Smith, AM and Edwards, R and Morgan, VI and Rosman, KJR, Seasonal variability in the input of lead, barium and indium to Law Dome, Antarctica, Geochimica Et Cosmochimica Acta, 75, (1) pp. 1-20. ISSN 0016-7037 (2011) [Refereed Article]

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DOI: doi:10.1016/j.gca.2010.09.037


Lead (Pb) isotopic compositions and concentrations, and barium (Ba) and indium (In) concentrations have been determined at monthly resolution in five Law Dome (coastal Eastern Antarctica) ice core sections dated from 1757 AD to 1898 AD. ‘Natural’ background Pb concentrations in 1757 AD average 0.2 pg g1 and can be attributed to mineral dust and volcanic emissions, with 206Pb/207Pb ratios reaching up to 1.266 ± 0.002. From 1887 AD to 1898 AD, Pb concentrations reached 5 pg g1 and 206Pb/207Pb ratios decreased to 1.058 ± 0.001 as a result of additional inputs of Pb from anthropogenic sources. Seasonal variability in the late 1880s has been investigated by decoupling volcanic Pb from the total measured Pb concentrations, revealing spring and autumn maxima, and consistent winter minima, in anthropogenic Pb and mineral dust (Ba) concentrations. We link this variability to the annual cycle in the position and strength of the Antarctic Circumpolar Trough and, the Southern Ocean westerly winds to the north of the trough region. During the autumn and spring seasons, these systems increase in strength, transporting more impurity laden air from the Southern Hemisphere continental regions to Eastern Antarctica and Law Dome. As this Pb is isotopically identical to that emitted from south-eastern Australia (Broken Hill, Port Pirie) this implies a relatively direct air trajectory pathway from southern Australia to Law Dome (Eastern Antarctica).

Item Details

Item Type:Refereed Article
Keywords:lead, barium, indium, Law Dome, Antarctica
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Moy, AD\ (Dr Andrew Moy)
UTAS Author:Curran, M (Dr Mark Curran)
UTAS Author:Morgan, VI (Mr Vincent Morgan)
ID Code:76793
Year Published:2011
Web of Science® Times Cited:25
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-03-13
Last Modified:2012-05-14

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