Secondary Organic Aerosol Formation from Ambient Air at an Urban Site in Beijing: Effects of OH Exposure and Precursor Concentrations
Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR...
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| Published in | Environmental science & technology Vol. 52; no. 12; pp. 6834 - 6841 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
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United States
American Chemical Society
19.06.2018
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| Abstract | Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM2.5 concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing. |
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| AbstractList | Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM2.5 concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing. Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM₂.₅), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM₂.₅ concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing. Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM ), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing. Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM2.5 concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing.Secondary organic aerosol (SOA) is an important component of atmospheric fine particles (PM2.5), while the key factors controlling SOA formation in ambient air remain poorly understood. In this work, the SOA formation in Beijing urban ambient air was investigated using an oxidation flow reactor (OFR) with high concentrations of OH radicals. The SOA formation potential increased significantly with the increase of ambient PM2.5 concentration during the observation. The optimum ambient exposure time, which is the aging time equivalent to atmospheric oxidation (with similar OH exposure) associated with the peak SOA formation, varied between 2 and 4 days in this study. The OA enhancement in this study was much higher than that of developed countries under different environmental conditions. The higher OA enhancement is probably due to the higher concentrations of volatile organic compounds (VOCs) in the urban air of Beijing. This might also have occurred because fragmentation did not dominate in the oxidation of OA, and did not result in negative OA enhancement on highly polluted days compared to relatively clean days with similar exposure time. These results suggested that under typical ambient conditions, high concentrations of VOC precursors might contribute to sustained organic aerosol growth and long duration haze events in Beijing. |
| Author | Liu, Changgeng Chen, Tianzeng He, Hong Bao, Xiaolei Liu, Jun Chu, Biwu Wang, Ling |
| AuthorAffiliation | Institute of Urban Environment, Chinese Academy of Sciences Chinese Academy of Sciences North China Electric Power University Panzhihua University School of Resources and Environmental Engineering State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences Hebei Provincial Academy of Environmental Sciences College of Environmental Science and Engineering Center for Excellence in Regional Atmospheric Environment University of Chinese Academy of Sciences |
| AuthorAffiliation_xml | – name: Chinese Academy of Sciences – name: School of Resources and Environmental Engineering – name: College of Environmental Science and Engineering – name: North China Electric Power University – name: Institute of Urban Environment, Chinese Academy of Sciences – name: Center for Excellence in Regional Atmospheric Environment – name: University of Chinese Academy of Sciences – name: Hebei Provincial Academy of Environmental Sciences – name: State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences – name: Panzhihua University |
| Author_xml | – sequence: 1 givenname: Jun orcidid: 0000-0002-3065-799X surname: Liu fullname: Liu, Jun organization: North China Electric Power University – sequence: 2 givenname: Biwu surname: Chu fullname: Chu, Biwu email: bwchu@rcees.ac.cn organization: University of Chinese Academy of Sciences – sequence: 3 givenname: Tianzeng surname: Chen fullname: Chen, Tianzeng organization: University of Chinese Academy of Sciences – sequence: 4 givenname: Changgeng surname: Liu fullname: Liu, Changgeng organization: Panzhihua University – sequence: 5 givenname: Ling surname: Wang fullname: Wang, Ling organization: North China Electric Power University – sequence: 6 givenname: Xiaolei surname: Bao fullname: Bao, Xiaolei organization: Hebei Provincial Academy of Environmental Sciences – sequence: 7 givenname: Hong surname: He fullname: He, Hong email: honghe@rcees.ac.cn organization: University of Chinese Academy of Sciences |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/29775300$$D View this record in MEDLINE/PubMed |
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| SubjectTerms | Aerosols Aging air Atmospheric aerosols China Developed countries Environmental conditions environmental factors environmental science Exposure exposure duration Free radicals Haze hydroxyl radicals Organic compounds Oxidation Particulate matter particulates Precursors Urban areas VOCs Volatile organic compounds |
| Title | Secondary Organic Aerosol Formation from Ambient Air at an Urban Site in Beijing: Effects of OH Exposure and Precursor Concentrations |
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