1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica
1Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS and Joseph Fourier University, Grenoble, France
2Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette, France
3Niels Bohr Institute for Astronomy, Physics and Geophysics, Copenhagen, Denmark
4National Institute of Polar Research, Research Organization of Information and Systems (ROIS), Tokyo, Japan
5Center for Atmospheric and Oceanic Studies Graduate School of Science, Tohoku University, Sendai, Japan
6Physics Institute, University of Bern, Switzerland
7New Energy Resources Research Center, Kitami Institute of Technology, Kitami, Japan
8Frontier Collaborative Research Center, Yokohama, Japan
Abstract. 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.
Parrenin, F., Dreyfus, G., Durand, G., Fujita, S., Gagliardini, O., Gillet, F., Jouzel, J., Kawamura, K., Lhomme, N., Masson-Delmotte, V., Ritz, C., Schwander, J., Shoji, H., Uemura, R., Watanabe, O., and Yoshida, N.: 1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica, Clim. Past, 3, 243-259, doi:10.5194/cp-3-243-2007, 2007.