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Seasonal variability in the input of lead, barium and indium to Law Dome, Antarctica
Citation
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
Abstract
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: | Environment |
| Objective Group: | Climate and 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: | 24 |
| Deposited By: | CRC-Antarctic Climate & Ecosystems |
| Deposited On: | 2012-03-13 |
| Last Modified: | 2012-05-14 |
| Downloads: | 0 |
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