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VOC emissions, evolutions and contributions to SOA formation at a receptor site in eastern China

by B. Yuan, W. W. Hu, M. Shao, M. Wang, W. T. Chen, S. H. Lu, L. M. Zeng, M. Hu
Atmospheric Chemistry and Physics ()
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Volatile org. compds. (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 chem. losses of most VOC species during the Changdao campaign. A photochem.-age-based parameterization method is used to calc. VOC emission ratios and to quantify the evolution of ambient VOCs. The calcd. emission ratios of most hydrocarbons agree well with those obtained from emission inventory data, but detd. emission ratios of oxygenated VOCs (OVOCs) are significantly higher than those from emission inventory data. The photochem.-age-based parameterization method is also used to investigate primary emissions and secondary formation of org. aerosol. The primary emission ratio of org. aerosol (OA) to CO is detd. to be 14.9 μg m-3 ppm-1, and secondary org. aeorosols (SOA) are produced at an enhancement ratio of 18.8 μg m-3 ppm-1 CO after 50 h of photochem. processing in the atm. SOA formation is significantly higher than the level detd. from VOC oxidn. 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 arom. hydrocarbons (PAHs) and higher alkanes (> C10) account for as high as 17.4% of SOA formation, which suggests semi-volatile org. compds. (SVOCs) may be a large contributor to SOA formation during the Changdao campaign. The SOA formation potential of primary VOC emissions detd. 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 oxidn. in the two city clusters. on SciFinder(R)]

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