1. a NASA Goddard Space Flight Center, Greenbelt, Maryland
2. b Universities Space Research Association, Columbia, Maryland
3. c Center for Climate Systems Research, Columbia University, New York, New York
4. d NASA Goddard Institute for Space Studies, New York, New York
5. e Department of Atmospheric Science, The Pennsylvania State University, University Park, Pennsylvania
6. f National Center for Atmospheric Research, Boulder, Colorado
7. g Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado
8. h NOAA Chemical Sciences Laboratory, Boulder, Colorado