Preprints
https://doi.org/10.5194/egusphere-2022-247
https://doi.org/10.5194/egusphere-2022-247
 
06 May 2022
06 May 2022
Status: this preprint is open for discussion.

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

Zhiqiang Zhang1,2, Yele Sun1,2,3, Chun Chen1,2, Bo You1,2, Aodong Du1,2, Weiqi Xu1,2, Yan Li1,2, Zhijie Li1,2, Lu Lei1,2, Wei Zhou1, Jiaxing Sun1,2, Yanmei Qiu1,2, Lianfang Wei1, Pingqing Fu4, and Zifa Wang1,2 Zhiqiang Zhang et al.
  • 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 4Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China

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.

Zhiqiang Zhang et al.

Status: open (until 17 Jun 2022)

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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.