Maria Ángeles Burgos Simón, Stockholm, Sverige, Sweden, Gloria Titos, Andalusian Insitute for Earth System Research, Granada, Spain, Elisabeth Andrews, University of Colorado at Boulder, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, Huisheng Bian, NASA Goddard Space Flight Ctr, Greenbelt, MD, United States, Virginie Buchard, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Gabriele Curci, University of L'Aquila, CETEMPS, Department of Physical and Chemical Sciences, L'Aquila, Italy, Alf Kirkevag, Norwegian Meteorological Institute, Section for Climate Modelling and Air Pollution, Oslo, Norway, Hitoshi Matsui, Nagoya University, Nagoya, Japan, Cynthia A Randles, ExxonMobil Research and Engineering Company, Annandale, NJ, United States, Kai Zhang, Pacific Northwest National Lab, Richland, WA, United States and Paul Zieger, Stockholm University, ACES, Stockholm, Sweden