A tentative chronology for the EPICA Dome Concordia ice core

Geophysical Research Letters, Vol. 28, No. 22, p. 4243-4246, 2001 
J. Schwander
Physics Institute, University of Bern, Switzerland.
J. Jouzel
Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA-CNRS, Gif-sur-Yvette, France.
C.U. Hammer 
Departement of Geophysics, The Niels Bohr Institute of Astronomy, Physics and Geophysics, University of Copenhagen.
J.-R. Petit
Laboratoire de Glaciologie et Géophysique de l'Environnement, Saint-Martin-d'Heres, France.
R. Udisti
Department of Chemistry, University of Calabria, Arcavacata di Rende, Italy.
E. Wolff
British Antarctic Survey, Natural Environment Research Council, Cambridge, England.

ABSTRACT.
A tentative age scale (EDC1) for the last 45 kyr is established for the new 788-m EPICA Dome C ice core using a simple ice flow model. The age of volcanic eruptions, the end of the Younger Dryas event, and the estimated depth and age of elevated ¹⁰Be, about 41 kyr ago were used to calibrate the model parameters. The Uncertainty of EDC1 is estimated to ± 10 yr for 0 to 700 yr BP, up to ± 200 yr back to 10 kyr BP, and up to ± 2 kyr back to 41 kyr BP. The age of the air in the bubbles is calculated with a firn densification model. In the Holocene the air is about 2000 yr younger than the ice and about 5500 yr during the last glacial maximum.