1. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France;
2. Lawrence Berkeley National Laboratory, Earth and Environmental Science Area, Berkeley, CA;
3. CEREGE, Aix-Marseille University–CNRS–IRD, Marseille, France;
4. Total S.A, Pau, France