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. The climatological variation of aerosol properties and the planetaryboundary layer (PBL) during 2013–2015 over theYangtze River Delta (YRD) region were investigated by employing ground-based Micro Pulse Lidar (MPL) and CE-318sun-photometer observations. Combining Moderate Resolution Imaging Spectroradiometer (MODIS) and Cloud-Aerosol Lidar and InfraredPathfinder Satellite Observation (CALIPSO) satellite products, enhanced haze pollution events affected bydifferent types of aerosol over the YRD region were analyzed through vertical structures, spatial distributions, backwardtrajectories, and the potential source contribution function (PSCF) model. The results show that aerosols in the YRD aredominated by fine-mode particles, except in March. The aerosol optical depth (AOD) in June and September is higher due tohigh single scattering albedo (SSA) from hygroscopic growth, but it is lower in July and August due to wet deposition fromprecipitation. The PBL height (PBLH) is greater (means ranging from 1.23 to 1.84  km ) and more variable in thewarmer months of March to August, due to the stronger diurnal cycle and exchange of heat. Northern fine-mode pollutantsare brought to the YRD at a height of 1.5  km . The SSA increases, blocking the radiation to the surface, and coolingthe surface, thereby weakening turbulence, lowering the PBL, and in turn accelerating the accumulation of pollutants,creating a feedback to the cooling effect. Originated from the deserts in Xinjiang and Inner Mongolia, long-rangetransported dust masses are seen at heights of about 2  km over the YRD region with an SSA440 nm below 0.84, which heat air and raise the PBL, accelerating the diffusion of dustparticles. Regional transport from biomass-burning spots to the south of the YRD region bring mixed aerosol particles ata height below 1.5  km , resulting in an SSA440 nm below 0.89. During the winter, theaccumulation of the local emission layer is facilitated by stable weather conditions, staying within the PBL even below0.5  km .

atmospheric chemistry and physics

Aerosol optical characteristics and their vertical distributions under enhanced haze pollution events: effect of the regional transport of different aerosol types over eastern China