Source apportionment of VOCs and its contribution to O3 production during summertime in urban area of Taiyuan
LI Ru-mei1,2, YAN Yu-long1, WANG Cheng1,2, XU Yang1,2, LI Ying-hui1, PENG Lin1
1. Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; 2. School for Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Abstract：Air samples were collected to obtain the observed concentration of VOCs during summertime in the urban area of Taiyuan. A photochemical age-based parameterization method was applied to obtain the initial concentration of VOCs. Then the sources of VOCs were identified and the potential sources of O3 were analyzed. The average concentration of total VOCs was 48.13μg/m3 with the most abundant group of alkanes (25.52μg/m3). VOCs concentration shows a distinct diurnal variation with the lowest value in the critical time for photochemical reaction during daytime (10:00~14:00). Oil evaporation, vehicle emissions, coal combustion, biogenic emission and liquefied petroleum gas/natural gas (LPG/NG) usage were the major sources of summertime VOCs in urban area of Taiyuan, with the relative contribution of 26.89%, 25.55%, 21.14%, 14.99%, and 11.44% for VOCs sources, while their contributed to the O3 productionwere 21.44%, 33.10%, 24.07%, 13.77%, and 7.62% respectively. Local vehicle exhaust was the main contributor of VOCs in airmass with fresh emission characteristics, while oil evaporation and coal combustion mainly contributed to VOCs in airmasses characterized by mixed, nocturnal, and aged after oxidation reaction through transport and local accumulation. To sum up, vehicle emissions, coal combustion and oil evaporation were the major contributors of ambient VOCs and O3 production, while reduction the emissions of these sources can reduce the concentration level of ambient VOCs and effectively alleviate O3 production.
李如梅, 闫雨龙, 王成, 徐扬, 李颖慧, 彭林. 太原市城区夏季VOCs来源及其对O3生成的贡献[J]. 中国环境科学, 2021, 41(6): 2515-2525.
LI Ru-mei, YAN Yu-long, WANG Cheng, XU Yang, LI Ying-hui, PENG Lin. Source apportionment of VOCs and its contribution to O3 production during summertime in urban area of Taiyuan. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2515-2525.
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