Climate of the Past www.clim-past.net 1814-9324 1814-9332 3 2 2007 10.5194/cp-3-243-2007 http://www.clim-past.net/3/243/2007/ http://www.clim-past.net/3/243/2007/cp-3-243-2007.html http://www.clim-past.net/3/243/2007/cp-3-243-2007.pdf 243 259 2007-06-01 1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica F. Parrenin parrenin@ujf-grenoble.fr G. Dreyfus G. Durand S. Fujita O. Gagliardini F. Gillet J. Jouzel K. Kawamura N. Lhomme V. Masson-Delmotte C. Ritz J. Schwander H. Shoji R. Uemura O. Watanabe N. Yoshida Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS and Joseph Fourier University, Grenoble, France Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France Niels Bohr Institute for Astronomy, Physics and Geophysics, Copenhagen, Denmark 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 Physics Institute, University of Bern, Switzerland New Energy Resources Research Center, Kitami Institute of Technology, Kitami, Japan Frontier Collaborative Research Center, Yokohama, Japan One-dimensional (1-D) ice flow models are used to construct the age scales at the Dome C and Dome Fuji drilling sites (East Antarctica). The poorly constrained glaciological parameters at each site are recovered by fitting independent age markers identified within each core. We reconstruct past accumulation rates, that are larger than those modelled using the classical vapour saturation pressure relationship during glacial periods by up to a factor 1.5. During the Early Holocene, changes in reconstructed accumulation are not linearly related to changes in ice isotopic composition. A simple model of past elevation changes is developed and shows an amplitude variation of 110–120 m at both sites. We suggest that there is basal melting at Dome C (0.56±0.19 mm/yr). The reconstructed velocity profile is highly non-linear at both sites, which suggests complex ice flow effects. This induces a non-linear thinning function in both drilling sites, which is also characterized by bumps corresponding to variations in ice thickness with time. Andersen, K. K., Svensson, A., Johnsen, S. J., Rasmussen, S. O., Bigler, M., Röthlisberger, R., Ruth, U., Siggaard-Andersen, M.-L., Steffensen, J. P., Dahl-Jensen, D., Vinther, B. M., and Clausen, H. 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