1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 54-918, Cambridge, Massachusetts 02139, United States
2. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-290, Cambridge, Massachusetts 02139, United States
3. Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, United States
4. Department of Environmental Sciences, University of North Carolina at Chapel Hill, 135 Dauer Drive, 166 Rosenau Hall, Chapel Hill, North Carolina 27599, United States
5. Aerodyne Research Incorporated, Center for Aerosol and Cloud Chemistry, 45 Manning Road, Billerica, Massachusetts 01821, United States
6. Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
7. Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 68-132, Cambridge, Massachusetts 02139, United States