1. Department of Meteorology and Atmospheric Science Pennsylvania State University University Park PA USA
2. NASA Goddard Institute for Space Studies New York NY USA
3. Chemical Sciences Division, Earth System Research Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
4. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder CO USA
5. Polar Meteorology Group, Byrd Polar and Climate Research Center Ohio State University Columbus OH USA
6. Atmospheric Sciences Program, Department of Geography Ohio State University Columbus OH USA
7. Argonne National Laboratory Argonne IL USA
8. Space Science and Engineering Center University of Wisconsin Madison WI USA