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Knowledge Management System Of Guangzhou Institute of Geochemistry,CAS
Li, Xinyi1,2; Ren, Zhuoyue1,2; Zhang, Xiangyu1,2; Pang, Xiaodie1,2; Song, Wei1; Zhang, Yanli1,2; Wang, Xinming1,2 | |
Differences in Secondary Organic Aerosol Formation from α-Pinene Photooxidation in a Chamber with Purified Air and Ambient Air as Matrices: Preliminary Results | |
刊名 | ATMOSPHERE |
2024-02-01 | |
卷号 | 15期号:2页码:14 |
DOI | 10.3390/atmos15020204 |
语种 | 英语 |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
摘要 | alpha-Pinene is a biogenic volatile organic compound (BVOC) that significantly contributes to secondary organic aerosols (SOA) in the atmosphere due to its high emission rate, reactivity, and SOA yield. However, the SOA yield measured in chamber studies from alpha-pinene photooxidation is limited in a purified air matrix. Assessing SOA formation from alpha-pinene photooxidation in real urban ambient air based on studies conducted in purified air matrices may be subject to uncertainties. In this study, alpha-pinene photooxidation and SOA yield were investigated in a smog chamber in the presence of NO and SO2 under purified air and ambient air matrices. With the accumulation of ozone (O-3) during the photooxidation, an increasing part of alpha-pinene was consumed by O-3 and finally nearly half of the alpha-pinene was oxidized by O-3, facilitating the production of highly oxidized organic molecules and thereby SOA formation. Although the ambient air we introduced as matrix air was largely clean, with initial organic aerosol mass concentrations of similar to 1.5 mu g m-3, the alpha-pinene SOA yield in the ambient air matrix was 42.3 +/- 5.3%, still higher than that of 32.4 +/- 0.4% in the purified air matrix. The chemical characterization of SOA by the high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) revealed that CxHy accounted for 53.7 +/- 1.1% of the total signal in the ambient air matrix experiments, higher than 48.1 +/- 0.3% in the purified air, while CxHyO and CxHyO>1 together constituted 45.0 +/- 0.9% in the ambient air matrix, lower than 50.1 +/- 1.0% in the purified air. The O:C ratio in the ambient air matrix experiments was 0.41 +/- 0.01, lower than 0.46 +/- 0.01 in the purified air. The higher SOA yield of alpha-pinene in the ambient air matrix compared to that in the purified air matrix was partly due to the presence of initial aerosols in the ambient air, which facilitated the low volatile organic compounds produced from photochemical oxidation to enter the aerosol phase through gas-particle partitioning. The in-situ aerosol acidity calculated by the ISORROPIA-II model in the ambient air matrix experiments was approximately six times higher than that in purified air, and the higher SOA yield in the ambient air matrix experiments might also be attributed to acid-catalyzed SOA formation. |
关键词 | secondary organic aerosols alpha-pinene chamber simulation purified air ambient air |
WOS记录号 | WOS:001175086200001 |
收录类别 | SCI |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gig.ac.cn/handle/344008/77295 |
专题 | 有机地球化学国家重点实验室 |
通讯作者 | Wang, Xinming |
作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangdong Key Lab Environm Protect & Resources Uti, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Xinyi,Ren, Zhuoyue,Zhang, Xiangyu,et al. Differences in Secondary Organic Aerosol Formation from α-Pinene Photooxidation in a Chamber with Purified Air and Ambient Air as Matrices: Preliminary Results[J]. ATMOSPHERE,2024,15(2):14. |
APA | Li, Xinyi.,Ren, Zhuoyue.,Zhang, Xiangyu.,Pang, Xiaodie.,Song, Wei.,...&Wang, Xinming.(2024).Differences in Secondary Organic Aerosol Formation from α-Pinene Photooxidation in a Chamber with Purified Air and Ambient Air as Matrices: Preliminary Results.ATMOSPHERE,15(2),14. |
MLA | Li, Xinyi,et al."Differences in Secondary Organic Aerosol Formation from α-Pinene Photooxidation in a Chamber with Purified Air and Ambient Air as Matrices: Preliminary Results".ATMOSPHERE 15.2(2024):14. |
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