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A 220 kyr record of Pb isotopes at Dome C Antarctica from analyses of the EPICA ice core

Abstract : Pb isotopic compositions and Pb and Ba concentrations are reported in EPICA Dome C ice core samples dating to 220 kyr BP, indicating that Pb isotopic compositions in Antarctic ice vary with changing climate. 206Pb/207Pb ratios decrease during glacial periods, with the lowest values occurring during colder climatic periods (stages 2, 4 and 6) and the Holocene. Low Pb concentrations (<1 pg/g) were found during the Holocene and the last interglacial (climate stage 5.5) while higher Pb concentrations (>10 pg/g) were found during cold climatic periods. Ba, a proxy for mineral dust, was used to determine that dust usually accounts for ∼70% of Pb in Dome C ice, while the remaining ∼30% was attributed to volcanic emissions. Pb isotopic compositions at Dome C differ from those reported in pre-industrial ice from other Antarctic locations, due to greater proportions of dust Pb at Dome C.
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Submitted on : Friday, April 10, 2009 - 1:48:35 PM
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P. Vallelonga, Paolo Gabrielli, K. J. R. Rosman, Carlo Barbante, Claude Boutron. A 220 kyr record of Pb isotopes at Dome C Antarctica from analyses of the EPICA ice core. Geophysical Research Letters, American Geophysical Union, 2005, 32 (L01706), 1 à 4 p. ⟨10.1029/2004GL021449⟩. ⟨insu-00374946⟩

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