Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 3 2 2007 10.5194/cpd-3-575-2007 http://www.clim-past-discuss.net/3/575/2007/ http://www.clim-past-discuss.net/3/575/2007/cpd-3-575-2007.html http://www.clim-past-discuss.net/3/575/2007/cpd-3-575-2007.pdf 575 606 2007-03-12 The EDC3 chronology for the EPICA Dome C ice core F. Parrenin J.-M. Barnola J. Beer T. Blunier E. Castellano J. Chappellaz G. Dreyfus H. Fischer S. Fujita J. Jouzel K. Kawamura B. Lemieux-Dudon L. Loulergue V. Masson-Delmotte B. Narcisi J.-R. Petit G. Raisbeck D. Raynaud U. Ruth J. Schwander M. Severi R. Spahni J. P. Steffensen A. Svensson R. Udisti C. Waelbroeck E. Wolff Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS and Joseph Fourier University, Grenoble, France Department of Surface Waters, EAWAG, Dübendorf, Switzerland Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland Department of Chemistry, University of Florence, Florence, Italy Laboratoire des Sciences du Climat et de l'Environnement, IPSL/CEA/CNRS/UVSQ, Gif-Sur-Yvette, France Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany National Institute of Polar Research, Research Organization of Information and Systems (ROIS), Tokyo, Japan Center for Atmospheric and Oceanic Studies Graduate School of Science, Tohoku University, Sendai, Japan ENEA, C. R. Casaccia, Roma, Italy CSNSM/IN2P3/CNRS, Orsay, France Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark British Antarctic Survey, Cambridge, UK The EPICA (European Project for Ice Coring in Antarctica) Dome C drilling in East Antarctica has now been completed to a depth of 3260 m, at only a few meters above bedrock. Here we present the new official EDC3 chronology, which is based on the use of 1) a snow accumulation and mechanical flow model, and 2) a set of independent age markers along the core. These are obtained by pattern matching of recorded parameters to either absolutely dated paleoclimatic records, or to insolation variations. We show that this new time scale is in excellent agreement with the Dome Fuji and Vostok ice core time scales back to 100 kyr within 1 kyr. Discrepancies larger than 3 kyr arise during MIS 5.4, 5.5 and 6, which points to anomalies in either snow accumulation or mechanical flow during these time periods. 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