1. Institute for Atmospheric and Climate Science, ETH Zürich, Zurich, Switzerland;
2. Department of Geosciences, University of Oslo, Oslo, Norway;
3. Department of Environmental Science, and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden;
4. Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany;
5. Meteorological Research Institute, Tsukuba, Ibaraki, Japan;
6. National Research Council, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Bologna, Italy;
7. Institute for Polar Sciences, CNR, Bologna, and Institute for Polar Sciences, CNR, Rome, Italy;
8. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland;
9. National Institute of Polar Research, Tachikawa, Tokyo, Japan;
10. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan;
11. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany;
12. Laboratory of Atmospheric Processes and Their Impacts, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland;
13. Laboratory of Atmospheric Processes and Their Impacts, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, and Center for Studies of Air Quality and Climate Change, Institute for Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras, Greece;
14. Institute for Space–Earth Environmental Research, and Institute for Advanced Research, Nagoya University, Nagoya, Aichi, Japan;
15. Korea Polar Research Institute, Incheon,Korea;
16. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland, and U-Earth Biotech Ltd., London, United Kingdom;
17. Kitami Institute of Technology, Kitami, Hokkaido, Japan;
18. Department of Chemistry, University of Florence, Florence, Italy