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

Abstract 1 is 31.5 ± 22.7  µ g 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 µ g 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  µ g 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  µ g m - 3) < (3.7 × 10 - 4 µ g m - 3) <  aged-HOA (8.1 × 10 - 4 µ g m - 3) <  BBOA (0.012 µ g m - 3). Extremely low volatilities in ambient air indicate that oligomers may exist in aged plumes. The viscosity estimation suggests that the majority of ambient OA in this study behaves as semisolid (60 %), liquifies at higher relative humidity (RH) (21 %), and solidifies (19 %) during noon when the RH is low and the oxidation level is high. Finally, the estimated mixing time of molecules in 200 nm OA varies dramatically from minutes at night to years in the afternoon, emphasizing the need to consider its dynamic kinetic limits when modeling OA. In general, the overall results of this study improve our understanding of the impact of aging on OA volatility and viscosity.

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• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Impact of aging on the sources, volatility, and viscosity of organic aerosols in Chinese outflows ; volume:23 ; number:1 ; year:2023 ; pages:611-636 ; extent:26 ; Atmospheric chemistry and physics ; 23, Heft 1 (2023), 611-636 (gesamt 26)

Beteiligte, Orts- und Zeitangaben

• Urheber: 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

Weitere Informationen

• DOI: 10.5194/acp-23-611-2023
• URN: urn:nbn:de:101:1-2023011904251092488458
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.