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Discussion papers
https://doi.org/10.5194/acp-2018-1291
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1291
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Jan 2019

Research article | 16 Jan 2019

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

A study of volatility by composition, heating, and dilution measurements of secondary organic aerosol from 1,3,5-trimethylbenzene

Kei Sato1, Yuji Fujitani1, Satoshi Inomata1, Yu Morino1, Kiyoshi Tanabe1, Toshihide Hikida2, Akio Shimono2, Akinori Takami1, Akihiro Fushimi1, Yoshinori Kondo1, Takashi Imamura1, Hiroshi Tanimoto1, and Seiji Sugata1 Kei Sato et al.
  • 1National Institute for Environmental Studies (NIES), Ibaraki 305-8506, Japan
  • 2Shoreline Science Research, Inc., Tokyo, 192-0045, Japan

Abstract. Studies of the volatility distribution of secondary organic aerosol (SOA) from aromatic compounds are limited compared with SOA from biogenic monoterpenes. In this study, the volatility distribution was investigated by composition, heating, and dilution measurements for SOA formed from the photooxidation of 1,3,5-trimethylbenzene in the presence of NOx. Composition studies revealed that highly oxygenated monomers (C9H14Ox, x = 4–7) and dimers (C18H26Ox, x = 8–12) are the major products in SOA particles. Highly oxygenated molecules (HOMs) with 5 or more oxygens were formed during photochemical aging, whereas dimers degraded during photochemical aging. HOMs with 5 or more oxygens may be produced from the photooxidation of phenol-type gaseous products, whereas dimers in the particle phase may be photolyzed to smaller molecules during photochemical aging. The results of composition, heating, and dilution measurements showed that fresh SOA formed from 1,3,5-trimethylbenzene photooxidation includes low-volatility compounds with < 1 μg m−3 saturation concentrations, which are attributed to highly oxygenated monomers and dimers. Similar results were reported for α-pinene SOA in previous studies. Low-volatility compounds with < 1 μg m−3 saturation concentrations are not included in the volatility distributions employed in the standard VBS approach. Improvements in the organic aerosol model will be necessary for study of anthropogenic SOA as well as biogenic SOA.

Kei Sato et al.
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Data for "A study of volatility by composition, heating and dilution measurements of secondary organic aerosol from 1,3,5-trimethylbenzene" K. Sato, Y. Fujitani, S. Inomata, Y. Morino, K. Tanabe, T. Hikida, A. Shimono, A. Takami, A. Fushimi, Y. Kondo, T. Imamura, H. Tanimoto, and S. Sugata https://doi.org/10.6084/m9.figshare.7592861.v1

Kei Sato et al.
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Short summary
The volatility distributions of secondary organic aerosol (SOA) formed from the photooxidation of 1,3,5-trimethylbenzene were investigated by composition, heating, and dilution measurements. Fresh SOA, formed from 1,3,5-trimethylbenzene, included low-volatility compounds with < 1 μg·m–3 saturation concentrations, which are not assumed to exist in fresh SOA particles in the standard volatility basis-set approach. Improvements in the organic aerosol model will be necessary.
The volatility distributions of secondary organic aerosol (SOA) formed from the photooxidation...
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