Impact of aging on the sources, volatility, and viscosity of organic aerosols in Chinese outflows
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Published:2023-01-16
Issue:1
Volume:23
Page:611-636
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Feng Tingting, Wang Yingkun, Hu WeiweiORCID, Zhu Ming, Song Wei, Chen Wei, Sang Yanyan, Fang ZhengORCID, Deng WeiORCID, Fang Hua, Yu Xu, Wu ChengORCID, Yuan BinORCID, Huang Shan, Shao Min, Huang Xiaofeng, He Lingyan, Lee Young Ro, Huey Lewis GregoryORCID, Canonaco Francesco, Prevot Andre S. H., Wang XinmingORCID
Abstract
Abstract. 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) < transported-OOA (3.7×10-4µgm-3)< aged-HOA (8.1×10-4µgm-3)< BBOA (0.012 µg 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.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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