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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 3, issue 3 | Copyright

Special issue: The EPICA (EDC and EDML) ice cores age scales

Clim. Past, 3, 485-497, 2007
https://doi.org/10.5194/cp-3-485-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  17 Aug 2007

17 Aug 2007

The EDC3 chronology for the EPICA Dome C ice core

F. Parrenin1, J.-M. Barnola1, J. Beer2, T. Blunier3, E. Castellano4, J. Chappellaz1, G. Dreyfus5, H. Fischer6, S. Fujita7, J. Jouzel5, K. Kawamura8, B. Lemieux-Dudon1, L. Loulergue1, V. Masson-Delmotte5, B. Narcisi9, J.-R. Petit1, G. Raisbeck10, D. Raynaud1, U. Ruth6, J. Schwander3, M. Severi4, R. Spahni3, J. P. Steffensen11, A. Svensson11, R. Udisti4, C. Waelbroeck1, and E. Wolff12 F. Parrenin et al.
  • 1Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS and Joseph Fourier University, Grenoble, France
  • 2Department of Surface Waters, EAWAG, Dübendorf, Switzerland
  • 3Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
  • 4Department of Chemistry, University of Florence, Florence, Italy
  • 5Laboratoire des Sciences du Climat et de l'Environnement, IPSL/CEA/CNRS/UVSQ, Gif-Sur-Yvette, France
  • 6Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany
  • 7National Institute of Polar Research, Research Organization of Information and Systems (ROIS), Tokyo, Japan
  • 8Center for Atmospheric and Oceanic Studies Graduate School of Science, Tohoku University, Sendai, Japan
  • 9ENEA, C. R. Casaccia, Roma, Italy
  • 10CSNSM/IN2P3/CNRS, Orsay, France
  • 11Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  • 12British Antarctic Survey, Cambridge, UK

Abstract. 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 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. We estimate that EDC3 gives accurate event durations within 20% (2σ) back to MIS11 and accurate absolute ages with a maximum uncertainty of 6 kyr back to 800 kyr.

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