Global variability of aerosol optical properties retrieved from the network of GAW near-surface observatories

Alessandro Bigi, Martine Collaud Coen, Elisabeth J. Andrews, Clemence Rose, Cathrine Lund Myhre, Markus Fiebig, Michael Schulz, John A. Ogren, Jonas Gliss, Augustin Mortier, Alfred Wiedensohler, Marco Pandolfi, Tuukka Petäjä, Sang-Woo Kim, Wenche Aas, Jean-Philippe Putaud, Olga Mayol-Bracero, Melita Keywood, Lorenzo Labrador, Paolo Laj