1. Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
2. John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA USA
3. Department of Chemistry and Chemical Biology Harvard University Cambridge MA USA
4. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China
5. Analytical Sciences Division, RTI International, Research Triangle Park Durham NC USA
6. Asian School of the Environment and Earth Observatory of Singapore Nanyang Technological University Singapore
7. Now in the Department of Atmospheric and Oceanic Sciences, School of Physics, and BIC‐ESAT Peking University Beijing China
8. Now in Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry University of York York UK
9. Italian National Research Council ‐ Institute of Atmospheric Sciences and Climate (CNR‐ISAC) Bologna Italy
10. Department of Atmospheric Sciences University of Washington WA USA
11. College of Flying Technology Civil Aviation University of China Tianjin China