1. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.
2. Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA.
3. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USA.
4. Department of Civil and Environmental Engineering, University of California, Davis, CA, USA.
5. Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA.
6. National Center for Atmospheric Research, Boulder, CO, USA.
7. Department of Chemistry, Université de Montréal, Montréal, Quebec, Canada.
8. Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA.
9. School of Forestry and Environmental Studies, Yale University, New Haven, CT, USA.
10. Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
11. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA, USA.
12. Department of Civil and Environmental Engineering, University of California, Berkeley, CA, USA.