Articles | Volume 22, issue 24
Research article
 | Highlight paper
20 Dec 2022
Research article | Highlight paper |  | 20 Dec 2022

Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes

Qing Ye, Matthew B. Goss, Jordan E. Krechmer, Francesca Majluf, Alexander Zaytsev, Yaowei Li, Joseph R. Roscioli, Manjula Canagaratna, Frank N. Keutsch, Colette L. Heald, and Jesse H. Kroll

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Cited articles

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Executive editor
This paper is a significant advancement in the understanding of the chemistry of dimethyl sulfide (DMS) and its oxidation products in the atmosphere. DMS is mainly emitted by marine phytoplankton and forms a relevant natural source of non-sea salt sulfate aerosols which plays an important role in global aerosol climate effects. However, the chemistry by which DMS oxidizes to form sulfate aerosols is highly complex. This work represents a next important step in the understanding of chemical processes within the reaction of OH with DMS. The results of this study allow to include a better, because less simplified, inclusion of DMS chemistry in large-scale models which can reduce errors in predicted aerosol radiative effects in past, present and future atmospheres.
Short summary
The atmospheric oxidation of dimethyl sulfide (DMS) is a major natural source of sulfate particles in the atmosphere. However, its mechanism is poorly constrained. In our work, laboratory measurements and mechanistic modeling were conducted to comprehensively investigate DMS oxidation products and key reaction rates. We find that the peroxy radical (RO2) has a controlling effect on product distribution and aerosol yield, with the isomerization of RO2 leading to the suppression of aerosol yield.
Final-revised paper