Impact of aging on the sources, volatility, and viscosity of organic aerosols in Chinese outflows

To investigate the impact of aging on the sources, volatility, and viscosity of organic aerosol (OA) in Chinese outflows, a high-resolution time-of-flight aerosol mass spectrometer (HR-AMS) coupled with a thermodenuder (TD) was deployed in the spring of 2018 in Dongying, which is a regional receptor...

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Veröffentlicht in:Atmospheric chemistry and physics 2023-01, Vol.23 (1), p.611-636
Hauptverfasser: Feng, Tingting, Wang, Yingkun, Hu, Weiwei, Zhu, Ming, Song, Wei, Chen, Wei, Sang, Yanyan, Fang, Zheng, Deng, Wei, Fang, Hua, Yu, Xu, Wu, Cheng, Yuan, Bin, Huang, Shan, Shao, Min, Huang, Xiaofeng, He, Lingyan, Lee, Young Ro, Huey, Lewis Gregory, Canonaco, Francesco, Prevot, Andre S. H, Wang, Xinming
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Sprache:eng
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Zusammenfassung:To investigate the impact of aging on the sources, volatility, and viscosity of organic aerosol (OA) in Chinese outflows, a high-resolution time-of-flight aerosol mass spectrometer (HR-AMS) coupled with a thermodenuder (TD) was deployed in the spring of 2018 in Dongying, which is a regional receptor site of metropolitan emissions in the North China Plain (NCP). The average mass concentration of PM1 is 31.5±22.7 µg m−3, which is mainly composed of nitrate (33 %) and OA (25 %). The source apportionment results show that the OA is mainly contributed by oxygenated OA (OOA) from secondary sources, including background-OOA (33 %) representing a background concentration of OA (2.6 µg m−3) in the NCP area, and transported-OOA (33 %) oxidized from urban emissions. The other two factors include aged hydrocarbon-liked OA (aged-HOA, 28 %) from transported vehicle emissions and biomass burning OA (BBOA, 5 %) from local open burning. The volatility of total OA (average C*=3.2×10-4 µg m−3) in this study is generally lower than that reported in previous field studies, which is mainly due to the high OA oxidation level resulting from aging processes during transport. The volatilities of OA factors follow the order of background-OOA (average C*=2.7×10-5 µg m−3) 
ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-23-611-2023