1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
2. Institute for Space and Atmospheric Science, University of Saskatchewan, Saskatoon, SK, S7N 5A2 Canada
3. Institute for Environmental and Climate Research, Jinan University, Guangzhou 510630, China
4. Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80307
5. Department of Atmospheric and Oceanic Sciences, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303
6. Goddard Earth Science Technology and Research (GESTAR), NASA Goddard Space Flight Center, Greenbelt, MD 20771
7. NOAA Chemical Sciences Laboratory, Boulder, CO 80305
8. Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529
9. Department of Chemistry, University of Waterloo, Waterloo, ON, N2L 3G1 Canada