Preprints
https://doi.org/10.5194/egusphere-2024-4103
https://doi.org/10.5194/egusphere-2024-4103
22 Jan 2025
 | 22 Jan 2025

Significant secondary formation of nitrogenous organic aerosols in an urban atmosphere revealed by bihourly measurements of bulk organic nitrogen and comprehensive molecular markers

Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu

Abstract. Nitrogenous organic aerosol (OA) has a significant impact on solar radiation, human health, and ecosystems. However, our knowledge of the total budget of aerosol organic nitrogen (ON) and its major sources, particularly the secondary formation processes, remains largely qualitative. In this study, we conducted bihourly measurements of aerosol ON and a comprehensive array of organic and inorganic source markers in urban Shanghai during the fall-winter period of 2021. ON accounted for 6–58 % of the total aerosol N, averaging 20 %. Positive factorization matrix source apportionment revealed that both primary emissions (52 %) and secondary formations (48 %) made substantial contributions to the ON mass. Dominant primary ON sources included coal combustion and vehicle emissions, accounting for 21 % each. Five significant secondary formation processes of ON were identified, namely nitrate formation (14 %), photochemical formation (10 %), nitroaromatics formation (7 %), dicarboxylic acids (DCA) formation (8 %), and oxygenated cooking OA (7 %). DCA formation-related ON likely represented reduced N-containing organic species such as imidazoles and amides. Nitrate formation processes produced OA with a very low organic carbon-to-ON ratio, suggesting a heterogeneous/aqueous formation of organic nitrates. Our field work provides first quantitative source analysis and new insights into the secondary formation processes of ON aerosols in an urban atmosphere.

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Journal article(s) based on this preprint

19 Aug 2025
Significant secondary formation of nitrogenous organic aerosols in an urban atmosphere revealed by bihourly measurements of bulk organic nitrogen and comprehensive molecular markers
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu
Atmos. Chem. Phys., 25, 9061–9074, https://doi.org/10.5194/acp-25-9061-2025,https://doi.org/10.5194/acp-25-9061-2025, 2025
Short summary
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-4103', Anonymous Referee #1, 14 Feb 2025
  • RC2: 'Comment on egusphere-2024-4103', Anonymous Referee #2, 29 Mar 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-4103', Anonymous Referee #1, 14 Feb 2025
  • RC2: 'Comment on egusphere-2024-4103', Anonymous Referee #2, 29 Mar 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Xu Yu on behalf of the Authors (09 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (28 May 2025) by Quanfu He
AR by Xu Yu on behalf of the Authors (30 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (02 Jun 2025) by Quanfu He
AR by Xu Yu on behalf of the Authors (07 Jun 2025)  Manuscript 

Journal article(s) based on this preprint

19 Aug 2025
Significant secondary formation of nitrogenous organic aerosols in an urban atmosphere revealed by bihourly measurements of bulk organic nitrogen and comprehensive molecular markers
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu
Atmos. Chem. Phys., 25, 9061–9074, https://doi.org/10.5194/acp-25-9061-2025,https://doi.org/10.5194/acp-25-9061-2025, 2025
Short summary
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu
Xu Yu, Min Zhou, Shuhui Zhu, Liping Qiao, Jinjian Li, Yingge Ma, Zijing Zhang, Kezheng Liao, Hongli Wang, and Jian Zhen Yu

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Online measurements of bulk aerosol organic nitrogen (ON), in conjunction with a comprehensive array of source markers, have revealed five emission sources and five potentially significant formation processes of nitrogenous organic aerosols. This study provides first quantitative source analysis of ON aerosol and valuable observational evidence on secondary ON aerosol formation through NH3 and NOx chemistries.
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