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

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

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3201706v&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 1, CiteID L01706

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7

Cryosphere: Biogeochemistry (0412, 0414, 1615, 4805, 4912), Geochemistry: Radiogenic Isotope Geochemistry, Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Processes: Paleoclimatology (0473, 4900), Geographic Location: Antarctica (4207)

Scientific paper

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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