%0 Journal Article %T A 220 kyr record of Pb isotopes at Dome C Antarctica from analyses of the EPICA ice core %+ Department of Applied Physics %+ Laboratoire de glaciologie et géophysique de l'environnement (LGGE) %+ Environmental Sciences Department %+ Institute for the Dynamics of Environmental Processes-CNR %+ Observatoire des Sciences de l'Univers de Grenoble (OSUG) %A Vallelonga, P. %A Gabrielli, Paolo %A Rosman, K. J. R. %A Barbante, Carlo %A Boutron, Claude, F. %Z European Project for Ice Coring in Antarctica (EPICA) %< avec comité de lecture %@ 0094-8276 %J Geophysical Research Letters %I American Geophysical Union %V 32 %N L01706 %P 1 à 4 pages %8 2005 %D 2005 %R 10.1029/2004GL021449 %Z Sciences of the Universe [physics]/Earth Sciences/GlaciologyJournal articles %X 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. %G English %2 https://insu.hal.science/insu-00374946/document %2 https://insu.hal.science/insu-00374946/file/2004GL021449.pdf %L insu-00374946 %U https://insu.hal.science/insu-00374946 %~ INSU %~ UNIV-SAVOIE %~ UGA %~ CNRS %~ UNIV-GRENOBLE1 %~ INPG %~ IRSTEA %~ OSUG %~ LGGE %~ AGREENIUM %~ INRAE %~ USMB-COMUE