Preprints
https://doi.org/10.5194/egusphere-2022-247
https://doi.org/10.5194/egusphere-2022-247
06 May 2022
 | 06 May 2022

Sources and processes of water-soluble and water-insoluble organic aerosol in cold season in Beijing, China

Zhiqiang Zhang, Yele Sun, Chun Chen, Bo You, Aodong Du, Weiqi Xu, Yan Li, Zhijie Li, Lu Lei, Wei Zhou, Jiaxing Sun, Yanmei Qiu, Lianfang Wei, Pingqing Fu, and Zifa Wang

Abstract. Water-soluble and water-insoluble organic aerosol (WSOA and WIOA) constitute a large fraction of fine particles in winter in northern China, yet our understanding of their sources and processes are still limited. Here we have a comprehensive characterization of WSOA in cold season in Beijing. Particularly, we present the first mass spectral characterization of WIOA by integrating online and offline organic aerosol measurements from a high-resolution aerosol mass spectrometer. Our results showed that WSOA on average accounted for 59 % of the total OA and comprised dominantly secondary OA (SOA, 69 %). The WSOA composition showed significant changes during the transition season from autumn to winter. While the photochemical-related SOA dominated WSOA (51 %) in early November, the oxidized SOA from biomass burning increased substantially from 8 % to 29 % during the heating season. Comparatively, local primary OA dominantly from cooking aerosol contributed the major fraction of WSOA during clean periods. WIOA showed largely different spectral patterns from WSOA which were characterized by prominent hydrocarbon ions series and low oxygen-to-carbon (O / C = 0.19) and organic mass-to-organic carbon ratio (OM / OC = 1.39). The nighttime WIOA showed less oxidized properties (O / C = 0.16 vs. 0.24) with more pronounced polycyclic aromatic hydrocarbons (PAHs) signals than daytime, indicating the impacts of enhanced coal combustion emissions on WIOA. The evolution process of WSOA and WIOA was further demonstrated by the triangle plot of f44 (fraction of m/z 44 in OA) vs. f43, f44 vs. f60, and the Van Krevelen diagram (H / C vs. O / C). We also found more oxidized WSOA and an increased contribution of SOA in WSOA compared with previous winter studies in Beijing, indicating that the changes in OA composition due to clean air action have affected the sources and properties of WSOA.

Journal article(s) based on this preprint

15 Aug 2022
Sources and processes of water-soluble and water-insoluble organic aerosol in cold season in Beijing, China
Zhiqiang Zhang, Yele Sun, Chun Chen, Bo You, Aodong Du, Weiqi Xu, Yan Li, Zhijie Li, Lu Lei, Wei Zhou, Jiaxing Sun, Yanmei Qiu, Lianfang Wei, Pingqing Fu, and Zifa Wang
Atmos. Chem. Phys., 22, 10409–10423, https://doi.org/10.5194/acp-22-10409-2022,https://doi.org/10.5194/acp-22-10409-2022, 2022
Short summary

Zhiqiang Zhang et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-247', Anonymous Referee #1, 26 May 2022
  • RC2: 'Comment on egusphere-2022-247', Anonymous Referee #2, 07 Jul 2022
  • AC1: 'Reply to reviewers' comments', Yele Sun, 21 Jul 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-247', Anonymous Referee #1, 26 May 2022
  • RC2: 'Comment on egusphere-2022-247', Anonymous Referee #2, 07 Jul 2022
  • AC1: 'Reply to reviewers' comments', Yele Sun, 21 Jul 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Yele Sun on behalf of the Authors (26 Jul 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (28 Jul 2022) by Dantong Liu
AR by Yele Sun on behalf of the Authors (29 Jul 2022)

Journal article(s) based on this preprint

15 Aug 2022
Sources and processes of water-soluble and water-insoluble organic aerosol in cold season in Beijing, China
Zhiqiang Zhang, Yele Sun, Chun Chen, Bo You, Aodong Du, Weiqi Xu, Yan Li, Zhijie Li, Lu Lei, Wei Zhou, Jiaxing Sun, Yanmei Qiu, Lianfang Wei, Pingqing Fu, and Zifa Wang
Atmos. Chem. Phys., 22, 10409–10423, https://doi.org/10.5194/acp-22-10409-2022,https://doi.org/10.5194/acp-22-10409-2022, 2022
Short summary

Zhiqiang Zhang et al.

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Short summary
We present a comprehensive characterization of water-soluble organic aerosol and the first mass spectral characterization of water-insoluble organic aerosol in cold season in Beijing by integrating online and offline aerosol mass spectrometer measurements. WSOA comprised dominantly secondary OA, and showed large changes during the transition season from autumn to winter. WIOA was characterized by prominent hydrocarbon ions series, low oxidation states, and significant day-night differences.