1. School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, UK.
2. Department of Geosciences, University of Cologne, Pohligstraße 3, 50969 Cologne, Germany.
3. Department of Geological Sciences, College of Physical and Mathematical Sciences, Brigham Young University, Provo, UT 84602, USA.
4. Sagan Center at the SETI Institute, Mountain View, CA 94043, USA.
5. NASA Ames Research Center, Moffett Field, CA 94035, USA.
6. Laboratoire de Météorologie Dynamique, Université Pierre et Marie Curie, Paris, France.
7. University of California Santa Cruz, Santa Cruz, CA, USA.
8. Lowell Observatory, Flagstaff, AZ, USA.
9. Southwest Research Institute, Boulder, CO, USA.
10. National Optical Astronomy Observatory, Tucson, AZ 85726, USA.
11. Department of Earth, Atmosphere, and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
12. Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA.