Comparing the Epica and Vostok dust records during the last 220,000 years: stratigraphical correlation and provenance in glacial periods [An article from: Earth Science Reviews]

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Description:
A new aeolian dust record from the first 2200 m of the EPICA-Dome C ice core (75^o06'S, 123^o21'E) covering about 220,000 years of climatic history is compared to the Vostok (78^o28'S, 106^o48'E) ice core [Nature 399 (1999) 429]. The two dust profiles are very similar and several common dust events allow to establish stratigraphical links. The late Quaternary period is characterized at both sites, and likely overall East Antarctic plateau, by high dust input during glacial periods. In the EPICA-Dome C ice core, the dust flux rises by a factor of ~25, ~20 and ~12 in glacial stages 2, 4 and 6 with respect to interglacial periods (Holocene and stage 5.5). The magnitude and pattern of changes are comparable in the Vostok ice core. In this study, the geographical origin of ice core dust (ICD) in cold periods has been investigated at both sites through ^8^7Sr/^8^6Sr versus ^1^4^3Nd/^1^4^4Nd isotopic tracers, following the previous studies of Grousset et al. [Earth Planet. Sci. Lett. 111 (1992) 175] and Basile et al. [Earth Planet. Sci. Lett. 146 (1997) 573]. The new data and the existing ones allow to define the isotopic fields for dust at the two Antarctic sites that are almost identical and restricted into the 0.708