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| Titel |
VOC emissions, evolutions and contributions to SOA formation at a receptor site in eastern China |
| VerfasserIn |
B. Yuan, W. W. Hu, M. Shao, M. Wang, W. T. Chen, S. H. Lu, L. M. Zeng, M. Hu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 17 ; Nr. 13, no. 17 (2013-09-04), S.8815-8832 |
| Datensatznummer |
250085674
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| Publikation (Nr.) |
 copernicus.org/acp-13-8815-2013.pdf |
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| Zusammenfassung |
| Volatile organic compounds (VOCs) were measured by two online instruments
(GC-FID/MS and PTR-MS) at a receptor site on Changdao Island
(37.99° N, 120.70° E) in eastern China. Reaction with OH
radical dominated chemical losses of most VOC species during the Changdao
campaign. A photochemical-age-based parameterization method is used to
calculate VOC emission ratios and to quantify the evolution of ambient VOCs.
The calculated emission ratios of most hydrocarbons agree well with those
obtained from emission inventory data, but determined emission ratios of
oxygenated VOCs (OVOCs) are significantly higher than those from emission
inventory data. The photochemical-age-based parameterization method is also used
to investigate primary emissions and secondary formation of organic aerosol.
The primary emission ratio of organic aerosol (OA) to CO is determined to be
14.9 μg m−3 ppm−1, and secondary organic aeorosols (SOA) are produced at an enhancement
ratio of 18.8 μg m−3 ppm−1 to CO after 50 h of photochemical processing in the
atmosphere. SOA formation is significantly higher than the level determined
from VOC oxidation under both high-NOx (2.0 μg m−3 ppm−1 CO) and
low-NOx conditions (6.5 μg m−3 ppm−1 CO). Polycyclic aromatic
hydrocarbons (PAHs) and higher alkanes (> C10) account for as
high as 17.4% of SOA formation, which suggests semi-volatile organic
compounds (SVOCs) may be a large contributor to SOA formation during the
Changdao campaign. The SOA formation potential of primary VOC emissions
determined from field campaigns in Beijing and Pearl River Delta (PRD) is
lower than the measured SOA levels reported in the two regions, indicating
SOA formation is also beyond explainable by VOC oxidation in the two city
clusters. |
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