A 220 kyr record of Pb isotopes at Dome C Antarctica from analyses of the EPICA ice core
- 13 January 2005
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 32 (1)
- https://doi.org/10.1029/2004gl021449
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 (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.Keywords
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