Alfaro-Contreras, R., J. Zhang, J. Reid, and S. Christopher (2017), A Study of the Longer Term Variation of Aerosol Optical Thickness and Direct 2 Shortwave Aerosol Radiative Effect Trends Using MODIS and CERES 3 4, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-365.