1. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
2. Earth and Planetary Sciences, School of Geosciences; University of Edinburgh; Edinburgh United Kingdom
3. Institute of Earth Sciences; University of Iceland; Reykjavik Iceland
4. Icelandic Meteorological Office; Reykjavik Iceland
5. Hawaii Institute of Geophysics and Planetology; University of Hawaii; Honolulu Hawaii USA
6. Goddard Space Flight Center; Greenbelt Maryland USA