1. Department of Earth and Environmental Sciences; KU Leuven; Leuven Belgium
2. Department of Environment; Ghent University; Ghent Belgium
3. Department of Atmospheric and Oceanic Sciences; University of Colorado Boulder; Boulder CO USA
4. Cryospheric Sciences Laboratory; NASA Goddard Space Flight Center; Greenbelt MD USA
5. Centre for Environmental and Marine Sciences, Department of Physics; University of Aveiro; Aveiro Portugal