Effects of relative humidity on aerosol light scattering and its importance for the comparison of remote sensing with in-situ measurements

(1) Paul Scherrer Institut, Laboratory of Atmospheric Chemistry, Villigen-PSI, Switzerland (paul.zieger@psi.ch, +41563104525), (2) Belgium Institute for Space Aeronomy, BIRA-IASB, Brussels, Belgium, (3) University of Heidelberg, Institute of Environmental Physics, Heidelberg, Germany, (4) Japan Agency for Marine-Earth Science and Technology, Research Institute for Global Change, Yokohama, Japan, (5) TNO, Utrecht, The Netherlands, (6) Finnish Meteorological Institute, Climate Change Unit, Helsinki, Finland, (7) University of Helsinki, Departement of Physics, Helsinki, Finland