Massachusetts Institute of Technology, Department of Earth, Atm. & Planetary Sciences, Cambridge, MA 02139-4307, USA; NASA/Goddard Space Flight Center, Laboratory for Terrestrial Physics, Greenbelt, MD 20771, USA
NASA/Goddard Space Flight Center, Laboratory for Terrestrial Physics, Greenbelt, MD 20771, USA
Massachusetts Institute of Technology, Department of Earth, Atm. & Planetary Sciences, Cambridge, MA 02139-4307, USA; NASA/Goddard Space Flight Center, Laboratory for Terrestrial Physics, Greenbelt, MD 20771, USA