1. Division of Ecosystem Sciences; University of California; Berkeley California USA
2. School of Earth, Atmospheric and Environmental Science; University of Manchester; Manchester UK
3. Department of Chemistry; University of Colorado; Boulder Colorado USA
4. Aerodyne Research Incorporated; Billerica Massachusetts USA
5. NOAA Earth System Research Laboratory; Boulder Colorado USA
6. Division of Engineering and Applied Sciences; Harvard University; Cambridge Massachusetts USA
7. Department of Interdisciplinary Arts and Sciences; University of Washington; Bothell Washington USA
8. Norwegian Institute for Air Research; Kjeller Norway