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Environ Pollut

Title:		Secondary organic aerosol formation and source contributions over east China in summertime
Author(s):		Li J; Han Z; Wu J; Tao J; Li J; Sun Y; Liang L; Liang M; Wang Q;
Address:		"Department of Atmospheric Science, Yunnan University, Kunming, 650091, China. Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: hzw@mail.iap.ac.cn. Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, China. Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China. Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China. School of the Environment, Nanjing University, Nanjing, 210023, China"
Journal Title:		Environ Pollut
Year:		2022
Volume:		20220430
Issue:
Page Number:		119383 -
DOI:		10.1016/j.envpol.2022.119383
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Various precursor emissions and chemical mechanisms for secondary organic aerosol (SOA) formation were incorporated into a regional air quality model system (RAQMS) and applied to investigate the distribution, composition, and source contribution of SOA over east China in summer 2018. Model comparison against a variety of observations at a national scale demonstrated that the model was able to reasonably reproduce meteorological variables, O(3) and PM(2.5) concentrations, and the model simulated SOA concentration generally agreed with observations, with the overall NMB of 7.0% and R of 0.4 in 10 cities over east China. The simulated period-mean SOA concentrations of 4-15 mug m(-3) were mainly distributed over the North China Plain (NCP), the middle and lower reaches of the Yangtze River and Chongqing district. SOA dominated organic aerosol (OA) over China in summertime (90%). The percentage contributions to SOA from ASOA (SOA produced from anthropogenic volatile organic compounds (AVOC)), BSOA (SOA produced from biogenic volatile organic compounds (BVOC)), DSOA (SOA produced from aqueous uptake of glyoxal and methylglyoxal) and S/I-SOA (SOA produced from semi-volatile and intermediate volatile organic compounds) were estimated to be 48.3%, 28.6%, 14.3%, and 8.8% respectively, over east China in summertime. In terms of domain and period average, ASOA contributed most to SOA (59%) in north China, while BSOA contributed most to SOA (37.3%) in northeast China. The percentage contribution of DSOA to SOA reached 21.5% in southwest China. S/I-SOA accounted for approximately 10% of SOA in most areas of east China. This study reveals that while AVOC dominates SOA formation on average over east China, the SOA source contributions differ considerably in different regions of China. BVOC makes the same contribution to SOA formation as AVOC in northeast China and southwest China, where forest coverage and BVOC emission are higher and anthropogenic emissions are relatively low, highlighting the significant role of BVOC in summer SOA formation in China"
Keywords:		Aerosols/analysis *Air Pollutants/analysis *Air Pollution China *Volatile Organic Compounds/analysis Aqueous uptake Biogenic volatile organic compound Chemical pathways Secondary organic aerosol Source contribution;
Notes:		"MedlineLi, Jie Han, Zhiwei Wu, Jian Tao, Jun Li, Jiawei Sun, Yele Liang, Lin Liang, Mingjie Wang, Qin'geng eng England 2022/05/04 Environ Pollut. 2022 Aug 1; 306:119383. doi: 10.1016/j.envpol.2022.119383. Epub 2022 Apr 30"