Anomalous flow below 2700 m in the EPICA Dome C ice core detected using d<sup>18</sup>O of atmospheric oxygen measurements - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Climate of the Past Discussions Année : 2007

Anomalous flow below 2700 m in the EPICA Dome C ice core detected using d18O of atmospheric oxygen measurements

Résumé

While there are no indications of mixing back to 800 000 years in the EPICA Dome C ice core record, comparison with marine sediment records shows significant differences in the timing and duration of events prior to stage 11 (~430 ka, thousand of years before 1950). A relationship between the isotopic composition of atmospheric oxygen (d18O of O2, noted d18Oatm) and daily northern hemisphere summer insolation has been observed for the youngest four climate cycles. Here we use this relationship with new d18O of O2 measurements to show that anomalous flow in the bottom 500 m of the core distorts the duration of events by up to a factor of 2. By tuning d18Oatm to orbital precession we derive a corrected thinning function and present a revised age scale for the interval corresponding to Marine Isotope Stages 11–20 in the EPICA Dome C ice core. Uncertainty in the phasing of d18Oatm with respect to insolation variations in the precession band limits the accuracy of this new agescale to ±6 kyr (thousand of years). The previously reported ~30 kyr duration of interglacial stage 11 is unchanged. In contrast, the duration of stage 15.1 is reduced by a factor of 2, from 31 to 16 kyr.
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Dates et versions

hal-00330721 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00330721 , version 1

Citer

G. B. Dreyfus, F. Parrenin, B. Lemieux-Dudon, Geoffroy Durand, Valérie Masson-Delmotte, et al.. Anomalous flow below 2700 m in the EPICA Dome C ice core detected using d18O of atmospheric oxygen measurements. Climate of the Past Discussions, 2007, 3 (1), pp.63-93. ⟨hal-00330721⟩
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