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

Aerosol optical characteristics and their vertical distribut...

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第十三届全国气溶胶会议

作者： Tianze SUN Huizheng CHE Bing QI Yaqiang WANG Yunsheng DONG Xiangao XIA Hong WANG Ke GUI Yu ZHENG Hujia ZHAO Qianli MA RongguangTianze SUN Bing QI DU Xiaoye ZHANG State Key Laboratory of Severe Weather(LASW)and Institute of Atmospheric Composition Chinese Academy of Meteorological SciencesCMA Hangzhou Meteorological Bureau Key Laboratory of Environment Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of Science Laboratory for Middle Atmosphere and Global Environment Observation(LAGEO) Institute of Atmospheric PhysicsChinese Academy of Sciences School of Geoscience University of Chinese Academy of Science Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&Technology

The climatological variation of aerosol properties and the planetary boundary（PBL） during 2013–2015 over the Yangtze River Delta（YRD） region were investigated by employing ground-based Microwave Pulse Lidar（MPL） and CE-318 sun-photometer *** MODIS and CALIPSO satellite products, enhanced haze pollution events affected by different types of aerosol over the YRD region were analyzed through vertical structures, spatial distributions, backward trajectories, and the Potential Source Contribution Function（PSCF） *** results show that aerosols in the YRD are dominated by fine-mode particles, except in *** aerosol optical depth（AOD） in June and September is higher due to high single scattering albedo（SSA） from hygroscopic growth, but is lower in July and August due to wet deposition from *** PBL height（PBLH） is greater（means ranging from 1.23 to 1.84 km） and more variable in the warmer months of March to August, due to the stronger diurnal cycle and exchange of *** fine-mode pollutants are brought to the YRD at a height of 1.5 *** SSA increases blocking the radiation to the surface, and cooling the surface, thereby weakening turbulence, lowering the PBL, and in turn accelerating the accumulation of pollutants, creating a feedback to the cooling *** from the deserts in Xinjiang and Inner Mongolia, long-range transported 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 upraise PBL, accelerating the diffusion of dust *** transport from biomass burning spots to the south of the YRD region bring mixed aerosol particles at a height below 1.5 km, resulting in an SSA440 nm below *** the winter, the accumulation of local emission layer is facilitated by stable weather condition, staying within the PBL even below 0.5 km.

关键词： aerosol optical property vertical structure backward trajectory multiple satellites Yangtze River Delta region

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