1. Institute for Atmospheric and Earth System Research/Physics Faculty of Science, University of Helsinki, Helsinki, Finland;
2. Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China;
3. LISA, UMR7583, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France