1. Department of Earth and Planetary Sciences; University of New Mexico; Albuquerque New Mexico USA
2. Laboratoire des Sciences du Climat et de l'Environnement; Paris France
3. Centre for Ice and Climate; Niels Bohr Institute, University of Copenhagen; Copenhagen Denmark
4. NASA Goddard Institute for Space Studies; New York New York USA
5. Department of Applied Physics and Applied Mathematics; Columbia University; New York New York USA
6. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
7. Laboratoire de Meteorologie Dynamique, Institut Pierre Simon Laplace; Centre National de la Recherche Scientifique; Paris France
8. Institute of Meteorology and Climate Research (IMK-ASF); Karlsruhe Institute of Technology (KIT); Karlsruhe Germany