Leighton Regayre¹, Jill S Johnson², Julia Schmale³, Christian Tatzelt⁴, Silvia Henning⁴, Andrea Baccarini⁵, Masaru Yoshioka⁶, Kirsty Pringle⁶, Martin Gysel⁷ and Ken S Carslaw¹, (1)University of Leeds, Leeds, LS2, United Kingdom, (2)University of Leeds, Institute for Climate and Atmospheric Science, School of Earth and Environment, Leeds, United Kingdom, (3)Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Villingen, Switzerland, (4)Leibniz Institute for Tropospheric Research, Leipzig, Germany, (5)Paul Scherrer Institute, Villigen, Switzerland, (6)University of Leeds, Leeds, United Kingdom, (7)Paul Scherrer Institute, 5232 Villigen, Switzerland