1. Department of Geography, University of Delaware, Newark, Delaware
2. Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado
3. Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan
4. Lamont Doherty Earth Observatory, Columbia University, Palisades, New York
5. Intelligence and Space Research Division, Los Alamos National Laboratory, Los Alamos, New Mexico
6. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico