1. Department of Atmospheric and Oceanic Sciences, School of PhysicsPeking University Beijing China
2. Division of Geological and Planetary SciencesCaltech Pasadena CA USA
3. Global Modeling and Assimilation OfficeNASA Goddard Space Flight Center Greenbelt MD USA
4. Department of Earth and Planetary Sciences and Planetary Sciences and School of EngineeringHarvard University Cambridge MA USA