Preprints
https://doi.org/10.5194/acp-2020-929
https://doi.org/10.5194/acp-2020-929

  18 Sep 2020

18 Sep 2020

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Increased Primary and Secondary H2SO4 Showing the Opposing Roles in SOA Formation from Ethyl Methacrylate Ozonolysis

Peng Zhang1,3,, Tianzeng Chen1,3,, Jun Liu1,3, Guangyan Xu1,3, Qingxin Ma1,2,3, Biwu Chu1,2,3, Wanqi Sun4, and Hong He1,2,3 Peng Zhang 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
  • 2Center for Excellence in Regional Atmos. Environ., Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4CMA Meteorological Observation Centre, Beijing, 100081, China
  • These authors contributed equally to this work.

Abstract. Stressed plants and polymer production can emit many unsaturated volatile organic esters (UVOEs). However, secondary organic aerosol (SOA) formation of UVOEs remain unclear, especially under complex ambient conditions. In this study, we mainly investigated ethyl methacrylate (EM) ozonolysis. Results showed that a substantial increase in secondary H2SO4 particles promoted SOA formation with increasing SO2. An important reason was that the homogeneous nucleation of more H2SO4 at high SO2 level provided greater surface area and volume for SOA condensation. However, increased primary H2SO4 with seed acidity enhanced EM uptake, but reduced SOA formation. This was ascribed to the fact that the ozonolysis of more adsorbed EM was hampered with the formation of surface H2SO4 at higher particle acidity. Moreover, the increase in secondary H2SO4 particle via homogeneous nucleation favored to the oligomerization of oxidation products, whereas the increasing of primary H2SO4 with acidity in the presence of seed tended to promote the functionalization conversion products. This study indicated that the role of increased H2SO4 to EM-derived SOA maybe not the same under different ambient conditions, which helps to advance our understanding of the complicated roles of H2SO4 in the formation of EM-derived SOA.

Peng Zhang et al.

 
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Peng Zhang et al.

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Short summary
This work highlights the opposing effects of primary and secondary H2SO4 on both SOA formation and constitutes. Our findings revealed that a substantial increase in secondary H2SO4 particles promoted the SOA formation of ethyl methacrylate with increasing SO2 in the absence of seed particles. However, increased primary H2SO4 with seed acidity enhanced ethyl methacrylate uptake, but reduced its SOA formation in the presence of seed particles.
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