Climate of the Past Discussions
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2007
10.5194/cpd-3-409-2007
http://www.clim-past-discuss.net/3/409/2007/
http://www.clim-past-discuss.net/3/409/2007/cpd-3-409-2007.html
http://www.clim-past-discuss.net/3/409/2007/cpd-3-409-2007.pdf
409
433
2007-03-01
Synchronisation of the EDML and EDC ice cores for the last 52 kyr by volcanic signature matching
M. Severi
mirko.severi@unifi.it
S. Becagli
E. Castellano
A. Morganti
R. Traversi
R. Udisti
U. Ruth
H. Fischer
P. Huybrechts
E. Wolff
F. Parrenin
P. Kaufmann
F. Lambert
J. P. Steffensen
Department of Chemistry, University of Florence, Florence, Italy
Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany
British Antarctic Survey, Cambridge, UK
Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS and Joseph Fourier University, Grenoble, France
Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
Departement Geografie, Vrije Universiteit Brussel, Brussels, Belgium
A common time scale for the EPICA ice cores from Dome C (EDC) and Dronning
Maud Land (EDML) was established. Since EDML core was not drilled on a dome,
the development of the <it>EDML1</it> time scale for the EPICA ice core drilled in
Dronning Maud Land was carried on by creating a detailed stratigraphic link
between this core and the one drilled at Dome C, dated by a simpler 1D
ice-flow model. The synchronisation between the two ice cores was built via
the identification of several common volcanic signatures. This paper
describes the rigorous method, using the signature of volcanic sulfate,
which was employed for the last 52 kyr of the record. By evaluating the
ratio R of the apparent duration of temporal intervals between couples of
isochrones, the depth comparison between the two cores was turned into an
estimate of anomalies between the modelled EDC and EDML glaciological age
models during the studied period. On average R ranges between 0.8 and 1.2
corresponding to an uncertainty within 20% in the estimate of the time
duration in at least one of the two ice cores. Significant deviations of R
up to 1.4–1.5 are observed between 18 and 28 kyr BP. At this step our
approach is not able to unequivocally find out which of the models is
affected by the errors, but assuming the thinning function at both sites and
accumulation history at Dome C, which was drilled on a dome, as being
correct, this anomaly can be ascribed to a complex spatial accumulation
variability (which may be different at present day and in the past) and to
upstream ice flow in the area of the EDML core.
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