1. Institute for Marine and Atmospheric Research, Utrecht University, Netherlands.
2. Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK.
3. Department of Earth System Science, University of California, Irvine, CA, USA.
4. Jet Propulsion Laboratory, Pasadena, CA, USA.
5. Delft Institute of Earth Observation and Space Systems, Delft University of Technology, Delft, Netherlands.
6. Royal Netherlands Meteorological Institute, De Bilt, Netherlands.