1. Laboratoire de Glaciologie et Gëophysique de l’Environnement, UMR 5183 CNRS/UJF, St Martin d’Hères, France;
2. EAWAG, Swiss Federal Institute of Environmental Science and Technology, Dübendorf, Switzerland;
3. Quaternary Geology, Lund University, Lund, Sweden
4. PSI, c.o. ETH-Hoenggerberg, Zürich, Switzerland;