Stratospheric AOD after the 2011 eruption of Nabro volcano measured by lidars over the Northern Hemisphere oleh P Sawamura, J P Vernier, J E Barnes, T A Berkoff, E J Welton, L Alados-Arboledas, F Navas-Guzmán, G Pappalardo, L Mona, F Madonna, D Lange, M Sicard, S Godin-Beekmann, G Payen, Z Wang, S Hu, S N Tripathi, C Cordoba-Jabonero, R M Hoff