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https://doi.org/10.5194/acp-2019-1218
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1218
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Feb 2020

Submitted as: research article | 13 Feb 2020

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A revised version of this preprint is currently under review for the journal ACP.

Temperature Effects on Optical Properties and Chemical Composition of Secondary Organic Aerosol Derived from n-Dodecane

Junling Li1,2,4, Weigang Wang1,2, Kun Li5, Wenyu Zhang1,2, Chao Peng1,2, Li Zhou6, Bo Shi1,2, Yan Chen1,2, Mingyuan Liu1,2, Hong Li4, and Maofa Ge1,2,3 Junling Li et al.
  • 1State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • 2University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • 3Center for Excellence in Regional Atmos. Environ., Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, P. R. China
  • 4State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, P. R. China
  • 5Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario M3H5T4, Canada
  • 6College of Architecture and Environment, Sichuan University, Chengdu, P. R. China

Abstract. Environmental temperature plays a vital role in controlling chemical transformations that lead to the formation of secondary organic aerosol (SOA), and ultimately impact composition and optical properties of the aerosol particles. In this study, we investigate optical properties of n-dodecane secondary organic aerosol under two temperature conditions: 5 °C and 25 °C. It is shown that low temperature can enhance the real part of refractive index (RI) of the SOA at the wavelengths of 532 nm and 375 nm. Mass spectrometry analysis reveals that molecular composition of n-dodecane SOA is significantly modified by temperature: a large amount of oligomers are formed under low temperature condition, which lead to higher RI values. These findings will help improve our understanding of the chemical composition and optical properties of SOA under different temperature conditions, and provide another possible explanation of the low visibility during winter.

Junling Li et al.

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Short summary
Long-chain alkanes, a large fraction of diesel fuel and its exhaust, are important potential contributor of SOA. Through the analysis of the components of formed SOA, we found that low temperature condition promotes the oligomerization of n-dodecane, and the degree of oligomerization can reach tetramerization. The presence of the oligomers enhances the light extinction of the particles. UV-scattering particles in the boundary layer can accelerate photochemical reactions and haze production.
Long-chain alkanes, a large fraction of diesel fuel and its exhaust, are important potential...
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