Articles | Volume 24, issue 23
https://doi.org/10.5194/acp-24-13793-2024
https://doi.org/10.5194/acp-24-13793-2024
Research article
 | 
12 Dec 2024
Research article |  | 12 Dec 2024

Molecular and seasonal characteristics of organic vapors in urban Beijing: insights from Vocus-PTR measurements

Zhaojin An, Rujing Yin, Xinyan Zhao, Xiaoxiao Li, Yuyang Li, Yi Yuan, Junchen Guo, Yiqi Zhao, Xue Li, Dandan Li, Yaowei Li, Dongbin Wang, Chao Yan, Kebin He, Douglas R. Worsnop, Frank N. Keutsch, and Jingkun Jiang

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Online Vocus-PTR measurements show the compositions and seasonal variations in organic vapors in urban Beijing. With enhanced sensitivity and mass resolution, various species at a level of sub-parts per trillion (ppt) and organics with multiple oxygens (≥ 3) were observed. The fast photooxidation process in summer leads to an increase in both concentration and proportion of organics with multiple oxygens, while, in other seasons, the variations in them could be influenced by mixed sources.
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