| Title: | "Characteristics of volatile organic compounds, NO(2), and effects on ozone formation at a site with high ozone level in Chengdu" |
| Author(s): | Deng Y; Li J; Li Y; Wu R; Xie S; |
| Address: | "College of Environmental Sciences and Engineering, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing 100871, China. Electronic address: dengyy_poi@pku.edu.cn. College of Environmental Sciences and Engineering, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing 100871, China. College of Environmental Sciences and Engineering, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing 100871, China. Electronic address: sdxie@pku.edu.cn" |
| DOI: | 10.1016/j.jes.2018.05.004 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "Chengdu is a megacity in the southwest of China with high ozone (O(3)) mixing ratio. Observation of volatile organic compounds (VOCs), NO(2) and O(3) with high temporal resolution was conducted in Chengdu to investigate the chemical processes and causes of high O(3) levels. The hourly mixing ratios of VOCs, NO(2), and O(3) were monitored by an online system from 28 August to 7 October, 2016. According to meteorological conditions, Chengdu, with relative warm weather and low wind speed, is favorable to O(3) formation. Part of the O(3) in Chengdu may be transported from the downtown area. In O(3) episodes, the average mixing ratios of NO(2) and O(3) were 20.20?ª+ppbv and 47.95?ª+ppbv, respectively. In non-O(3) episodes, the average mixing ratios of NO(2) and O(3) were 16.38?ª+ppbv and 35.15?ª+ppbv, respectively. The average mixing ratio of total VOCs (TVOCs) was 40.29?ª+ppbv in non-O(3) episodes, which was lower than that in O(3) episodes (53.19?ª+ppbv). Alkenes comprised 51.7% of the total O(3) formation potential (OFP) in Chengdu, followed by aromatics which accounted for 24.2%. Ethylene, trans-pentene, propene, and BTEX (benzene, ethylbenzene, toluene, m/p-xylene, o-xylene) were also major contributors to the OFP in Chengdu. In O(3) episodes, intensive secondary formations were observed during the campaign. Oxygenated VOCs (OVOCs), such as acetone, Methylethylketone (MEK), and Methylvinylketone (MVK) were abundant. Isoprene rapidly converted to MVK and Methacrolein (MACR) during O(3) episodes. Acetone was mainly the oxidant of C3-C5 hydrocarbons" |
| Keywords: | Air Pollutants/*analysis Alkenes Benzene Butadienes China *Environmental Monitoring Hemiterpenes Ozone/*analysis Pentanes Seasons Toluene Volatile Organic Compounds/*analysis Xylenes Diurnal variation No(2) Ofp Ozone formation VOCs; |
| Notes: | "MedlineDeng, Yuanyuan Li, Jing Li, Yaqi Wu, Rongrong Xie, Shaodong eng Netherlands 2018/11/27 J Environ Sci (China). 2019 Jan; 75:334-345. doi: 10.1016/j.jes.2018.05.004. Epub 2018 May 22" |
