| Title: | "Tower-based measurements of NMHCs and OVOCs in the Pearl River Delta: Vertical distribution, source analysis and chemical reactivity" |
| Author(s): | Mo Z; Huang S; Yuan B; Pei C; Song Q; Qi J; Wang M; Wang B; Wang C; Shao M; |
| Address: | "School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, 519082, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China. Electronic address: shanhuang_eci@jnu.edu.cn. Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center, Guangzhou, 510060, China. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China. College of Environmental Sciences and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China" |
| DOI: | 10.1016/j.envpol.2021.118454 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Measurements of vertical distribution of volatile organic compounds (VOCs) have attracted wide attentions, which could help to understand atmospheric oxidation mechanism and provide implications for VOC control. This study measured the non-methane hydrocarbons (NMHCs) and oxygenated VOCs (OVOCs) simultaneously for the first time at three different heights, namely ground, 118 m and 488 m, in the Canton Tower located in the urban core of the Pearl River Delta (PRD). The results show that NMHCs decreased while some OVOC species such as formaldehyde and acetaldehyde increased with increasing height. It was mainly attributed to the dilution and chemical loss of NMHCs but secondary production of OVOCs during vertical transport. Ratio analysis and receptor modeling indicate that vehicle exhausts (47%) and fuel evaporation (39%) were major sources of the total NMHCs. Interestingly, industry contributed much more at 118 m, probably affected by organic gas discharge from the high chimney of industrial factories. The chemical reactivities in terms of OH radical loss rate (L(OH)), ozone formation potential (OFP) and secondary organic aerosol potential (SOAP) were lowest at 118 m, smaller than those influenced by high fresh NMHC emissions at ground and strong formation of secondary species (e.g. OVOCs) at 488 m. OH exposure estimated by isoprene and m,p-xylene/ethylbenzene was different depending on their time scale of vertical turbulent mixing and chemical loss. OVOC species measured at different heights were positively correlated with O(x) (R = 0.48-0.87), indicating that OVOCs were largely contributed by secondary formation in photochemical process. The tower measurements of NMHCs and OVOCs provided a unique opportunity to investigate the VOC distribution and chemical behaviors, which could give important information for understanding O(3) and PM(2.5) pollution mechanism in the PRD region with fast developing urban setting and substantially changing air quality" |
| Keywords: | *Air Pollutants/analysis China Environmental Monitoring Hydrocarbons/analysis Methane *Ozone/analysis Rivers *Volatile Organic Compounds/analysis Chemical reactivity Source analysis Vertical profile Volatile organic compounds; |
| Notes: | "MedlineMo, Ziwei Huang, Shan Yuan, Bin Pei, Chenglei Song, Qicong Qi, Jipeng Wang, Ming Wang, Baolin Wang, Chen Shao, Min eng England 2021/11/06 Environ Pollut. 2022 Jan 1; 292(Pt B):118454. doi: 10.1016/j.envpol.2021.118454. Epub 2021 Nov 1" |
