1. Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR7583, CNRS, Université Paris-Est-Créteil (UPEC) et Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil 94010, France
2. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen-PSI CH-5232, Switzerland
3. Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
4. Department of Environmental Sciences, University of Basel, Basel 4056, Switzerland