Aerosol optical properties variability during biomass burning events observed by the eole-aias depolarization lidars over Athens, Greece (2007-2016)Maria Mylonaki, Alexandros Papayannis, Rodanthi Mamouri, Athina Argyrouli, Panagiotis Kokkalis, Georgios Tsaknakis and Ourania SoupionaEPJ Web Conf., 176 (2018) 05022DOI: https://doi.org/10.1051/epjconf/201817605022