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Sci Total Environ

Title:		The formation and evolution of secondary organic aerosol during haze events in Beijing in wintertime
Author(s):		Li J; Han Z; Li J; Liu R; Wu Y; Liang L; Zhang R;
Address:		"Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China. Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: hzw@mail.iap.ac.cn. Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20191102
Issue:
Page Number:		134937 -
DOI:		10.1016/j.scitotenv.2019.134937
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"A regional air quality model system (RAQMS) with a volatility basis set approach for secondary organic aerosol (SOA) formation and an emission inventory of semi-volatile (SVOC) and intermediate volatile organic compounds (IVOC) are applied to investigate the distribution and evolution of organic aerosols over the Beijing-Tianjin-Hebei (BTH) region in winter 2014, with focus on Beijing. Model validation demonstrates the model is capable of reproducing meteorological variables and major aerosol components, and the model significantly improves SOA and organic aerosol (OA) simulations by taking S/IVOCs (SVOC?ª++?ª+IVOC) and relevant aging processes into account. SVOC and IVOC emissions in the BTH region are estimated to be 0.47?ª+Tg and in a range of 0.09-0.36?ª+Tg, respectively, which are about 18% and 4-14% of the emission amounts of volatile organic compounds (VOCs). The distribution of mean organic aerosols is characterized by a high concentration belt oriented southwest-northeast from southern Hebei to Beijing, with the maximum concentration up to 50?ª+mug?ª+m(-3) in Beijing and Shijiazhuang. The simulated SOA concentration is comparable in magnitude to primary organic aerosol (POA) concentration, and the SOA/OA ratio is around 50% in most areas of the BTH region. In terms of domain average, the percentage contributions to SOA mass concentration from anthropogenic volatile organic compounds (AVOCs), SVOCs, IVOCs and biogenic VOCs are estimated to be 46.1%, 40.1%, 9.4% and 4.4%, respectively, in the BTH region during the study period, which indicates an important role of S/IVOCs in SOA formation. From clean to haze periods, both POA and SOA concentrations apparently increase, with an increasing (decreasing) trend of the SOA/OA (POA/OA) ratio. SOA dominates over POA in fine organic aerosols during the haze periods. The increase of POA in hazy days is mainly due to the weakened vertical diffusion and accumulation near the surface, whereas the increase of SOA is likely attributed to both the reduced diffusivity and a series of competing chemical processes, in which the decreased photolysis rate by aerosol attenuation tends to decrease SOA concentration by about 6% during the most severe haze day, whereas the lower surface air temperature and higher POA and S/IVOC concentrations in haze days both enhance gas to particle partition, and consequently lead to higher SOA concentration"
Keywords:		Beijing Gas-particle partition Photolysis rate S/IVOCs SOA/OA ratio Secondary organic aerosol;
Notes:		"PubMed-not-MEDLINELi, Jie Han, Zhiwei Li, Jiawei Liu, Ruiting Wu, Yunfei Liang, Lin Zhang, Renjian eng Netherlands 2019/11/27 Sci Total Environ. 2020 Feb 10; 703:134937. doi: 10.1016/j.scitotenv.2019.134937. Epub 2019 Nov 2"