The earth's climatic system consists in several components which strongly interact (atmosphere, ice sheets, oceans, lithosphere and biosphere). Numerical modelling is one among the appropriate tools for studying these interactions. In this work, Antarctic ice sheet evolution is modelled. For this we use a 3D model developped at the Laboratoire de Glaciologie et Geophysique de l'Environnement which takes into account thermomechanical coupling between velocities and temperatures in ice and specifi c case of ice-shelfs First the model was improved on many points like deformation law, friction law under ice-streams, heat deformation, basal melting parametrisation under ice-shelves and numeric modifi cations. Di fferent simulations indicate that the ice sheet behaviour is asymmetric during glaciation or deglaciation. We validate all the model modi cations with a simulation of the last four climatic cycles. Simulations for futur show a negligible contribution for the next centuries which becomes important on the longer term. Results are founds to be very sensitives to bedrock map. Finally, model resolution has been changed from 40 km to 20 km and allow to take into account ner bedrock structures.
