| Title: | "VOCs characteristics and their ozone and SOA formation potentials in autumn and winter at Weinan, China" |
| Author(s): | Li J; Deng S; Li G; Lu Z; Song H; Gao J; Sun Z; Xu K; |
| Address: | "School of Water and Environment, Chang'an University, Xi'an, 710064, China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an, 710064, China. School of Water and Environment, Chang'an University, Xi'an, 710064, China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an, 710064, China. Electronic address: dengsx@chd.edu.cn. School of Water and Environment, Chang'an University, Xi'an, 710064, China; School of Architectural Engineering, Chang'an University, Xi'an, 710064, China. Chinese Research Academy of Environmental Sciences, Beijing, China" |
| DOI: | 10.1016/j.envres.2021.111821 |
| ISSN/ISBN: | 1096-0953 (Electronic) 0013-9351 (Linking) |
| Abstract: | "Frequent ozone and fine particulate matter (PM(2.5)) pollution have been occurring in the Guanzhong Plain in China. To effectively control the tropospheric ozone and PM(2.5) pollution, this study performed measurements of 102 VOCs species from Sep.19-25 (autumn) and Nov.27-Dec. 8, 2017 (winter) at Weinan in the central Guanzhong Plain. The total volatile organic compounds (TVOCs) concentrations were 95.8 +/- 30.6 ppbv in autumn and 74.4 +/- 37.1 ppbv in winter. Alkanes were the most abundant group in both of autumn and winter, accounting for 33.5% and 39.6% of TVOCs concentrations, respectively. The levels of aromatics and oxygenated VOCs were higher in autumn than in winter, mainly due to changes in industrial activities and combustion strength. Photochemical reactivities and ozone formation potentials (OFPs) of VOCs were calculated by applying the OH radical loss rate (L(OH)) and maximum incremental reactivity (MIR) method, respectively. Results showed that Alkenes and aromatics were the key VOCs in term ozone formation in Weinan, which together contributed 59.6% ?? 65.3% to the total L(OH) and OFP. Secondary organic aerosol formation potentials (SOAFP) of the measured VOCs were investigated by employing the fractional aerosol coefficient (FAC) method. Aromatics contributed 94.9% and 96.2% to the total SOAFP in autumn and winter, respectively. The regional transport effects on VOCs and ozone formation were investigated by using trajectory analysis and potential source contribution function (PSCF). Results showed that regional anthropogenic sources from industrial cities (Tongchuan, Xi'an city) and biogenic sources from Qinling Mountain influenced VOCs levels and OFP at Weinan. Future studies need to emphasize on meteorological factors and sources that impact on VOCs concentrations in Weinan" |
| Keywords: | *Air Pollutants/analysis China Environmental Monitoring *Ozone/analysis *Volatile Organic Compounds/analysis Ozone formation Regional transport Secondary organic aerosol VOCs composition; |
| Notes: | "MedlineLi, Jianghao Deng, Shunxi Li, Guanghua Lu, Zhenzhen Song, Hui Gao, Jian Sun, Zhigang Xu, Ke eng Research Support, Non-U.S. Gov't Netherlands 2021/08/10 Environ Res. 2022 Jan; 203:111821. doi: 10.1016/j.envres.2021.111821. Epub 2021 Aug 8" |
