Alexei A Kiselev¹, Tilia Gädeke¹, Alice Keinert¹, Rainer Abart² and Thomas Leisner^1,3, (1)Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research - Atmospheric Aerosol Research, Karlsruhe, Germany, (2)University of Vienna, Faculty of Earth Sciences, Geography and Astronomy, Department of Litospheric Research, Vienna, Austria, (3)University of Heidelberg, Institute of Environmental Physics, Heidelberg, Germany