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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 1 | Copyright

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

Clim. Past, 3, 155-167, 2007
https://doi.org/10.5194/cp-3-155-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  19 Mar 2007

19 Mar 2007

Change in ice rheology during climate variations – implications for ice flow modelling and dating of the EPICA Dome C core

G. Durand1, F. Gillet-Chaulet2, A. Svensson1, O. Gagliardini2, S. Kipfstuhl3, J. Meyssonnier2, F. Parrenin2, P. Duval2, and D. Dahl-Jensen1 G. Durand et al.
  • 1Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  • 2Laboratoire de Glaciologie et de Géophysique de l'Environnement, Saint Martin d'Hères, France
  • 3Alfred Wegener Institute, Bremerhaven, Germany

Abstract. The study of the distribution of crystallographic orientations (i.e., the fabric) along ice cores provides information on past and current ice flow in ice-sheets. Besides the usually observed formation of a vertical single maximum fabric, the EPICA Dome C ice core (EDC) shows an abrupt and unexpected strengthening of its fabric during termination II around 1750 m depth. Such strengthening has already been observed for sites located on an ice-sheet flank. This suggests that horizontal shear could occur along the EDC core. Moreover, the change in the fabric leads to a modification of the effective viscosity between neighbouring ice layers. Through the use of an anisotropic ice flow model, we quantify the change in effective viscosity and investigate its implication for ice flow and dating.

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