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https://doi.org/10.5194/egusphere-2025-92
https://doi.org/10.5194/egusphere-2025-92
25 Feb 2025
 | 25 Feb 2025

Measurement Report: Molecular composition, sources, and evolution of atmospheric organic aerosols in a basin city in China

Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot

Abstract. Although organic aerosols (OA) have important impacts on climate, environment, and health, research on OA in Sichuan Basin, one of the heavily polluted areas in China, is still scarce. In this study, the PM2.5 were collected during winter 2023 in Chengdu, the capital city of Sichuan Province, and analyzed for organic compounds using gas chromatography–mass spectrometry. The total average concentration of 125 organic compounds was 2013.4 ± 902.4 ng m−3 (mean ± standard deviation), and they were dominated by fatty acids (28.9 %), phthalate esters (28.4 %), and anhydrosugars (18.0 %). Anthropogenic sources such as fossil fuel and biomass burning were the main sources of aliphatic lipids. Softwood burning was the main source of anhydrosugars. Although both are related to the aging of polycyclic aromatic hydrocarbons (PAHs), oxygenated PAHs and phthalic acids demonstrated different generation mechanisms. The isoprene secondary OA (SOA) tracers were strongly affected by NOx, relative humidity, and aerosol acidity. Biomass burning was an important source of biogenic SOA tracers. Tracer-based methods revealed that anthropogenic sources (11.6 %), β-caryophyllene (11.0 %), and biomass burning (10.0 %) were important sources of organic carbon (OC). Positive matrix factorization (PMF) analysis demonstrated that secondary formation (22.2 %) was the greatest source of OC, followed by dust (20.4 %), vehicular emissions (17.6 %), plastic related sources (17.4 %), biomass burning (11.3 %), coal combustion (6.2 %), and primary biogenic emissions (5.0 %). As pollution worsened, the proportions of secondary inorganic species and secondary OC in PM2.5 increased substantially; PMF analyses indicated that OC increase was caused mainly by secondary formation and biomass burning.

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Journal article(s) based on this preprint

18 Aug 2025
Measurement report: Molecular composition, sources, and evolution of atmospheric organic aerosols in a basin city in China
Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot
Atmos. Chem. Phys., 25, 8983–9004, https://doi.org/10.5194/acp-25-8983-2025,https://doi.org/10.5194/acp-25-8983-2025, 2025
Short summary
Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-92', Anonymous Referee #1, 04 Mar 2025
  • RC2: 'Comment on egusphere-2025-92', Anonymous Referee #2, 27 Apr 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-92', Anonymous Referee #1, 04 Mar 2025
  • RC2: 'Comment on egusphere-2025-92', Anonymous Referee #2, 27 Apr 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Junke Zhang on behalf of the Authors (08 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (23 May 2025) by Alex Huffman
AR by Junke Zhang on behalf of the Authors (25 May 2025)  Manuscript 

Journal article(s) based on this preprint

18 Aug 2025
Measurement report: Molecular composition, sources, and evolution of atmospheric organic aerosols in a basin city in China
Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot
Atmos. Chem. Phys., 25, 8983–9004, https://doi.org/10.5194/acp-25-8983-2025,https://doi.org/10.5194/acp-25-8983-2025, 2025
Short summary
Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot

Data sets

data for "Measurement Report: Molecular composition, sources, and evolution of atmospheric organic aerosols in a basin city in China" J. Zhang https://doi.org/10.5281/zenodo.14875327

Junke Zhang, Xinyi Fu, Chunying Chen, Yunfei Su, Siyu Liu, Luyao Chen, Yubao Chen, Gehui Wang, and Andre S. H. Prevot

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Short summary
The 125 organic aerosol (OA) compounds in PM2.5 in winter in Chengdu were measured at the molecular level. OA was dominated by fatty acids, phthalate esters, and anhydrosugars, and were deeply influenced by anthropogenic sources. As pollution worsens: secondary inorganic species and secondary organic carbon (OC) dominated the increase in PM2.5; fatty acids and anhydrosugars dominated the increase in OA; and the contribution of secondary formation and biomass burning to OC increased markedly.
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