Preprints
https://doi.org/10.5194/egusphere-2023-2960
https://doi.org/10.5194/egusphere-2023-2960
06 Mar 2024
 | 06 Mar 2024

Interaction between marine and terrestrial biogenic volatile organic compounds: Non-linear effect on secondary organic aerosol formation

Xiaowen Chen, Lin Du, Zhaomin Yang, Shan Zhang, Narcisse Tsona Tchinda, Jianlong Li, and Kun Li

Abstract. Biogenic volatile organic compounds (BVOCs) are the largest source of secondary organic aerosols (SOA) globally. However, the complex interactions between marine and terrestrial BVOCs remain unclear, inhibiting our in-depth understanding of the SOA formation in the coastal areas and its environmental impacts. Here, we performed smog chamber experiments with mixed α-pinene (a typical monoterpene) and dimethyl sulfide (DMS, a typical marine emission BVOC) to investigate their possible interactions and subsequent SOA formation. It is found that DMS has a non-linear effect on SOA generation: the mass concentration and yield of SOA show an increasing and then decreasing trend with the increase of the initial concentration of DMS. The increasing trend can be attributed to OH regeneration together with acid-catalyzed heterogeneous reactions by the oxidation of DMS, while the decreasing trend is explained by the high OH reactivity that inhibits the formation of low volatility products. The results from infrared spectra and mass spectra together reveal the contribution of sulfur-containing molecules in the mixed system. Moreover, the mass spectra results indicate that acidic products generated by DMS photooxidation enhance the O:C ratio, while organosulfates are produced to contribute to the formation of mixed SOA. In addition, the trends in relative abundance of highly oxygenated organic molecules (HOMs) with C8-C10 multiple functional groups in different mixed systems agree well with the turning point of the SOA yield. The findings of this study have significant implications for understanding binary or more complex systems in the atmosphere in the coastal areas.

Xiaowen Chen, Lin Du, Zhaomin Yang, Shan Zhang, Narcisse Tsona Tchinda, Jianlong Li, and Kun Li

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2960', Anonymous Referee #1, 08 Apr 2024
  • RC2: 'Comment on egusphere-2023-2960', Anonymous Referee #2, 10 Apr 2024
Xiaowen Chen, Lin Du, Zhaomin Yang, Shan Zhang, Narcisse Tsona Tchinda, Jianlong Li, and Kun Li
Xiaowen Chen, Lin Du, Zhaomin Yang, Shan Zhang, Narcisse Tsona Tchinda, Jianlong Li, and Kun Li

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Short summary
In this study, the interactions between α-pinene and marine emission dimethyl sulfide (DMS) are investigated. It is found that the yield of secondary organic aerosol initially increases and then decreases with the increasing DMS/α-pinene ratio. This trend can be explained by OH regeneration, acid-catalyzed reactions, and the change in OH reactivity, etc. These findings can improve our understanding of atmospheric processes in coastal areas.