1. Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
2. Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany
3. Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
4. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. The Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China