1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
2. Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA.
3. Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, MI 49931, USA.
4. Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany.
5. Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA.
6. NASA Ames Research Center, Moffett Field, CA 94035, USA.