Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany

now at: Institute for Marine and Atmospheric Sciences Utrecht, Utrecht University, Utrecht, The Netherlands

Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany

now at: Department of Physics, Lund University, Lund, Sweden

Leibniz-Institute for Tropospheric Research, Leipzig, Germany

now at: National Environmental Research Institute, Aarhus University, Roskilde, Denmark

Leibniz-Institute for Tropospheric Research, Leipzig, Germany

now at: Dillon Consulting Ltd., Toronto, Canada

Leibniz-Institute for Tropospheric Research, Leipzig, Germany

Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany

now at: Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, Germany

Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany

Leibniz-Institute for Tropospheric Research, Leipzig, Germany

now at: Department for Applied Environmental Science (ITM), Stockholm University, Stockholm, Sweden

Leibniz-Institute for Tropospheric Research, Leipzig, Germany

Max Planck Institute for Chemistry, Biogeochemistry Department, Mainz, Germany