245 articles – 3648 Notices  [english version]
HAL : in2p3-00182732, version 1

Fiche détaillée  Récupérer au format
Climate of the Past 3 (2007) 485-497
The EDC3 chronology for the EPICA Dome C ice core
F. Parrenin1, J.-M. Barnola1, J. Beer, T. Blunier, E. Castellano, J. Chappellaz1, G. Dreyfus2, H. Fischer, S. Fujita, J. Jouzel2, K. Kawamura, B. Lemieux-Dudon1, L. Loulergue1, V. Masson-Delmotte2, B. Narcisi, J.-R. Petit1, G. Raisbeck3, D. Raynaud1, U. Ruth, J. Schwander, M. Severi, R. Spahni, J. P. Steffensen, A. Svensson, R. Udisti, C. Waelbroeck1, E. Wolff

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.
1 :  LGGE - Laboratoire de glaciologie et géophysique de l'environnement
2 :  LSCE - UMR 8212 - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Planète et Univers/Sciences de la Terre/Géophysique

Planète et Univers/Sciences de la Terre/Glaciologie
Liste des fichiers attachés à ce document : 
cp-3-485-2007.pdf(628.9 KB)
supplement_1.xls(566 KB)
supplement_2.xls(424 KB)