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Discussion papers
https://doi.org/10.5194/acp-2018-1000
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1000
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 09 Oct 2018

Research article | 09 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Enhancement of Secondary Organic Aerosol Formation and its Oxidation State by SO2 during Photooxidation of 2-Methoxyphenol

Changgeng Liu1,2,*, Tianzeng Chen1,4,*, Yongchun Liu1,4,5, Jun Liu1,4, Hong He1,3,4, and Peng Zhang1,4 Changgeng Liu et al.
  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 2School of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, China
  • 3Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 4University of Chinese Academy of Sciences, Beijing 100049, China
  • 5Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • *These authors contributed equally to this work and should be considered as co-first authors

Abstract. 2-Methoxyphenol (guaiacol) is derived from the lignin pyrolysis and taken as a potential tracer for wood smoke emissions. In this work, the effect of SO2 at atmospheric levels (0–56ppb) on secondary organic aerosol (SOA) formation and its oxidation state during guaiacol photooxidation was investigated in the presence of various inorganic seed particles (NaCl and (NH4)2SO4). Without SO2 and seed particles, SOA yields (9.46–26.37%) obtained at different guaiacol concentration (138.83–2197.36μgm−3) could be well expressed by a one-product model. The presence of SO2 resulted in enhancing SOA yield by 14.05–23.66%. With (NH4)2SO4 and NaCl seed particles, SOA yield was enhanced by 23.06% and 29.57%, respectively, which further increased significantly to 29.78–53.47% in the presence of SO2, suggesting that SO2 and seed particles have a synergetic contribution to SOA formation. It should be noted that SO2 was found to be in favor of increasing the carbon oxidation state (OSC) of SOA, indicating that the functionalization reaction should be more dominant than oligomerization reaction. In addition, the average N/C ratio of SOA was 0.037, which revealed that NOx participated in the photooxidation process, consequently leading to the formation of organic nitrates. The experimental results demonstrate the importance of SO2 on the formation processes of SOA and organosulfates, and also are helpful to further understand SOA formation from the atmospheric photooxidation of guaiacol and its subsequent impacts on air quality and climate.

Changgeng Liu et al.
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Short summary
The effect of SO2 at atmospheric levels on SOA formation and its oxidation state during 2-methoxyphenol photooxidation was investigated with various inorganic seed particles. The presence of SO2 increased SOA yields and oxidation state, suggesting that functionalization reaction should be more dominant than oligomerization reaction. SO2 and seed particles were found to have a synergetic contribution to SOA formation. The results demonstrate the important role of SO2 on SOA formation process.
The effect of SO2 at atmospheric levels on SOA formation and its oxidation state during...
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