Measurement report: Brown carbon aerosol in polluted urban air of the North China Plain – day–night differences in the chromophores and optical properties
Abstract 62 ± 8 %) than during the night (47 ± 26 %), which is in line with the difference in chromophoric polarity between daytime (more polar nitrated aromatics) and nighttime (more less-polar polycyclic aromatic hydrocarbons, PAHs). The high polarity and water solubility of BrC in the daytime suggests the enhanced contribution of secondary formation to BrC during the day. There was a decrease in the mass absorption efficiency of BrC from nighttime to daytime (2.88 ± 0.24 vs. 2.58 ± 0.14 for WS-BrC and 1.43 ± 0.83 vs. 1.02 ± 0.49 m2 g C- 1 for WIS-BrC, respectively). Large polycyclic aromatic hydrocarbons (PAHs) with four- to six-ring PAHs and nitrophenols contributed to 76.7 % of the total light absorption between 300–420 nm at nighttime, while nitrocatechols and two- to three-ring oxygenated PAHs accounted for 52.6 % of the total light absorption during the day. The total mass concentrations of the identified chromophores showed larger day–night difference during the low-pollution period (day-to-night ratio of 4.3) than during the high-pollution period (day-to-night ratio of 1.8). The large day–night difference in BrC composition and absorption, therefore, should be considered when estimating the sources, atmospheric processes, and impacts of BrC.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Measurement report: Brown carbon aerosol in polluted urban air of the North China Plain – day–night differences in the chromophores and optical properties ; volume:23 ; number:24 ; year:2023 ; pages:15197-15207 ; extent:11
Atmospheric chemistry and physics ; 23, Heft 24 (2023), 15197-15207 (gesamt 11)
- Urheber
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Gong, Yuquan
Huang, Ru-Jin
Yang, Lu
Wang, Ting
Yuan, Wei
Xu, Wei
Cao, Wenjuan
Wang, Yang
Li, Yongjie
- DOI
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10.5194/acp-23-15197-2023
- URN
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urn:nbn:de:101:1-2023122103444908209627
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:30 MESZ
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Beteiligte
- Gong, Yuquan
- Huang, Ru-Jin
- Yang, Lu
- Wang, Ting
- Yuan, Wei
- Xu, Wei
- Cao, Wenjuan
- Wang, Yang
- Li, Yongjie
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