1. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder Colorado USA
2. Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
3. LaMP, OPGC, CNRS-UMR 6016, University of Blaise Pascal; Clermont-Ferrand France
4. Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry; University of York; York United Kingdom
5. New York State Department of Environmental Conservation; Division of Air Resources; Albany New York USA
6. LATMOS/CNRS, Paris and Laboratoire d'Aerologie/CNRS; Toulouse France
7. Department of Chemistry; University of Leicester; Leicester United Kingdom
8. Now at Department of Atmospheric Science; Colorado State University; Fort Collins Colorado USA
9. Institute for Advanced Sustainability Studies e.V.; Potsdam Germany