1. Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA.
2. Aerodyne Research, Billerica, MA 01821, USA.
3. Department of Chemistry, Boston College, Boston, MA 02467, USA.
4. Department of Physics, University of Helsinki, Helsinki FI-00014, Finland.
5. National Oceanic and Atmospheric Administration (NOAA) Pacific Marine Environmental Laboratory, Seattle, WA 98115, USA.
6. Air Quality Research Division, Environment Canada, Toronto M3H 5T4, Canada.
7. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164, USA.
8. NOAA Earth System Research Laboratory, Boulder, CO 80305, USA.
9. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA.
10. Centre for Atmospheric Chemistry, York University, Toronto M3J 1P3, Canada.
11. Department of Mechanical Engineering, University of Alberta, Edmonton T6G 2R3, Canada.
12. Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
13. RTI International, Research Triangle Park, NC 27709, USA.