1. Institute of Arctic and Alpine Research University of Colorado Boulder CO USA
2. Atmospheric Chemistry Observations and Modeling Laboratory National Center for Atmospheric Research Boulder CO USA
3. Now at Cooperative Institute for Research in the Atmosphere Colorado State University Fort Collins CO USA
4. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder CO USA
5. Chemical Sciences Laboratory Earth System Research Laboratory NOAA Boulder CO USA
6. School of Meteorology University of Oklahoma Norman OK USA
7. Stratton Park Engineering Company, Inc. Boulder CO USA
8. Chemistry and Dynamics Branch Langley Research Center National Aeronautics and Space Administration Hampton VA USA
9. Chemistry Department California State University San Bernardino CA USA
10. Ames Research Center Bay Area Environmental Research Institute National Aeronautics, and Space Administration Moffett Field CA USA