Skip to Main content Skip to Navigation
Journal articles

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.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-00374946
Contributor : Aurore Gayraud <>
Submitted on : Thursday, February 18, 2021 - 5:14:23 PM
Last modification on : Tuesday, September 7, 2021 - 3:54:32 PM
Long-term archiving on: : Wednesday, May 19, 2021 - 7:33:37 PM

File

2004GL021449.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

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⟩

Share

Metrics

Record views

271

Files downloads

73