1. Climate and Environmental Physics Division, Physics Institute; University of Bern; Bern Switzerland
2. Laboratoire Interactions et Dynamique des Environnements de Surface, UMR 8148 IDES; Université Paris-Sud; Orsay France
3. Robens Centre for Public and Environmental Health; University of Surrey; Guildford UK
4. Institute of Environmental Physics; University of Heidelberg; Heidelberg Germany
5. Water Resources and Drinking Water; Eidgenössische Anstalt für Wasserversorgung, Abwasserreinigung und Gewässerschutz; Dübendorf Switzerland