[1] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA
[2] ESTEC ESA, Noordwijk, Netherlands
[3] Univ Arkansas, WM Keck Lab Space & Planetary Simulat, Fayetteville, AR 72701 USA
[4] Univ Paris 06, Meteorol Dynam Lab, Jussieu, France
[5] Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA