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

• Published in: Geophysical Research Letters
• Main Authors: Vallelonga, Paul, Gabrielli, P., Rosman, Kevin, Barbante, C., Boutron, C.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Geophysical Union AGU 2005
• Subjects: Antarctic; Antarc*; Antarctica; EPICA; ice core
• Online Access: https://hdl.handle.net/20.500.11937/22539; https://doi.org/10.1029/2004GL021449

[1] 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.