1. Department of Soil, Water, and Climate, University of Minnesota, St. Paul, Minnesota 55108, United States
2. NOAA Chemical Sciences Laboratory, Boulder, Colorado 80305, United States
3. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States
4. Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, New York, New York 10964, United States
5. Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
6. NOAA Global Monitoring Laboratory, Boulder, Colorado 80305, United States
7. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, United States
8. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
9. Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80307, United States
10. Department of Chemistry, University of California, Irvine, California 92697, United States
11. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
12. Earth Systems Research Center/EOS, University of New Hampshire, Durham, New Hampshire 03824, United States