Climate of the Past Discussions
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2007
10.5194/cpd-3-63-2007
http://www.clim-past-discuss.net/3/63/2007/
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http://www.clim-past-discuss.net/3/63/2007/cpd-3-63-2007.pdf
63
93
2007-01-16
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ<sup>18</sup>O of atmospheric oxygen measurements
G. B. Dreyfus
gabrielle.dreyfus@cea.fr
F. Parrenin
B. Lemieux-Dudon
G. Durand
V. Masson-Delmotte
J. Jouzel
J.-M. Barnola
L. Panno
R. Spahni
A. Tisserand
U. Siegenthaler
M. Leuenberger
LSCE/IPSL, CEA-CNRS-UVSQ, CE Saclay, 91191, Gif-sur-Yvette, France
Department of Geosciences, Princeton University, Princeton, New Jersey, USA
Laboratoire de Glaciologie et Geophysique de l'Environnement (CNRS), St Martin d'Heres, France
Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen, Copenhagen, Denmark
Physics Institute, University of Bern, Bern, Switzerland
Université Bordeaux I, UMR 5805 EPOC, Environnements et Paleoenvironnements Océaniques et Côtiers, Talence Cedex 33405, France
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 (δ<sup>18</sup>O of
O<sub>2</sub>, noted δ<sup>18</sup>O<sub>atm</sub>) and daily northern hemisphere
summer insolation has been observed for the youngest four climate cycles.
Here we use this relationship with new δ<sup>18</sup>O of O<sub>2</sub>
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 δ<sup>18</sup>O<sub>atm</sub> 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 δ<sup>18</sup>O<sub>atm</sub> 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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