Jutta Vüllers¹, Ian M Brooks², Michael K H Tjernstrom³, John Prytherch³, Peggy Achtert⁴, Ryan Neely¹, Matthias Gottschalk⁵, Ulrike Egerer⁶, Manfred Wendisch⁵ and Holger Siebert⁶, (1)University of Leeds, Leeds, United Kingdom, (2)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (3)Stockholm University, Dept. of Meteorology, Stockholm, Sweden, (4)University of Reading, Dept. of Meteorology, Reading, United Kingdom, (5)University of Leipzig, Leipzig Institute for Meteorology, Leipzig, Germany, (6)Leibniz Institute for Tropospheric Research, Leipzig, Germany