Climate of the Past www.clim-past.net 1814-9324 1814-9332 3 1 2007 10.5194/cp-3-15-2007 http://www.clim-past.net/3/15/2007/ http://www.clim-past.net/3/15/2007/cp-3-15-2007.html http://www.clim-past.net/3/15/2007/cp-3-15-2007.pdf 15 37 2007-01-26 Numerical reconstructions of the Northern Hemisphere ice sheets through the last glacial-interglacial cycle S. Charbit sylvie.charbit@cea.fr C. Ritz G. Philippon V. Peyaud M. Kageyama LSCE/IPSL, CEA-CNRS-UVSQ, UMR 1572, CE Saclay, Orme des Merisiers, Bat. 701, 91191 Gif-sur-Yvette cedex, France LGGE, CNRS, 54, rue Molière-BP96, 38402 Saint Martin d'Hères cedex, France A 3-dimensional thermo-mechanical ice-sheet model is used to simulate the evolution of the Northern Hemisphere ice sheets through the last glacial-interglacial cycle. The ice-sheet model is forced by the results from six different atmospheric general circulation models (AGCMs). The climate evolution over the period under study is reconstructed using two climate equilibrium simulations performed for the Last Glacial Maximum (LGM) and for the present-day periods and an interpolation through time between these snapshots using a glacial index calibrated against the GRIP δ¹⁸O record. Since it is driven by the timing of the GRIP signal, the temporal evolution of the ice volume and the ice-covered area is approximately the same from one simulation to the other. However, both ice volume curves and spatial distributions of the ice sheets present some major differences from one AGCM forcing to the other. The origin of these differences, which are most visible in the maximum amplitude of the ice volume, is analyzed in terms of differences in climate forcing. This analysis allows for a partial evaluation of the ability of GCMs to simulate climates consistent with the reconstructions of past ice sheets. 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