Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 23, issue 11
Articles | Volume 23, issue 11
https://doi.org/10.5194/acp-23-6241-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-23-6241-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 11
Measurement report
 | 
07 Jun 2023
Measurement report |  | 07 Jun 2023

Measurement report: Diurnal variations of brown carbon during two distinct seasons in a megacity in northeast China

Yuan Cheng, Xu-bing Cao, Jiu-meng Liu, Ying-jie Zhong, Qin-qin Yu, Qiang Zhang, and Ke-bin He

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Latest update: 05 Jun 2025
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Short summary
Brown carbon (BrC) aerosols were explored in the northernmost megacity in China during a frigid winter and an agricultural-fire-impacted spring. BrC was more light absorbing at night for both seasons, with more pronounced diurnal variations in spring, and the dominant drivers were identified as regulations on heavy-duty diesel trucks and open burning, respectively. Agricultural fires resulted in unique absorption spectra of BrC, which were characterized by a distinct peak at ∼365 nm.
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