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. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder CO USA
4. Chemical Sciences Laboratory, Earth System Research Laboratory, NOAA Boulder CO USA
5. School of Meteorology University of Oklahoma Oklahoma OK USA
6. Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA USA
7. Division of Engineering and Applied Sciences California Institute of Technology Pasadena CA USA
8. Atmospheric Composition, NASA Langley Research Center Hampton VA USA
9. Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center Greenbelt MD USA
10. Joint Center for Earth Systems Technology University of Maryland, Baltimore County Baltimore MD USA
11. Chemistry and Dynamics Branch, National Aeronautics and Space Administration, Langley Research Center Hampton VA USA
12. Chemistry Department California State University San Bernardino CA USA
13. Now at: Department of Atmospheric, Science Colorado State University Fort Collins CO USA
14. Now at: Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration, Goddard Space Flight Center Greenbelt MD USA
15. Now at: Joint Center for Earth Systems Technology University of Maryland Baltimore County Baltimore MD USA
16. Stratton Park Engineering Company, Inc. Boulder CO USA
17. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
18. Bay Area Environmental Research Institute, National Aeronautics and Space Administration, Ames Research Center Moffett Field CA USA
19. School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA
20. Department of Earth, Ocean and Atmospheric Science Florida State University Tallahassee FL USA