Cloud and aerosol classification for 2.5 years of MAX-DOAS observations in Wuxi (China) and comparison to independent data sets - Wang, Y.; Penning de Vries, M.; Xie, P. H.; Beirle, S.; Dörner, S.; Remmers, J.; Li, A.; Wagner, T. (Atmos. Meas. Tech., 2015)