1. Department of Meteorology and Atmospheric Science The Pennsylvania State University University Park PA USA
2. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA
3. NOAA Earth System Research Laboratory Global Monitoring Laboratory Boulder CO USA
4. Now at Atmospheric Sciences & Global Change Division Pacific Northwest National Laboratory Richland WA USA
5. Now at School of Integrated Sciences James Madison University Harrisonburg VA USA
6. Department of Geosciences The Pennsylvania State University University Park PA USA
7. Earth and Environmental Systems Institute The Pennsylvania State University University Park PA USA
8. Cooperative Institute for Research in the Atmosphere Colorado State University Fort Collins CO USA