Articles | Volume 25, issue 21
https://doi.org/10.5194/acp-25-15359-2025
https://doi.org/10.5194/acp-25-15359-2025
Research article
 | 
10 Nov 2025
Research article |  | 10 Nov 2025

Chloric acid-driven nucleation enhanced by dimethylamine and sulfuric acid in the Arctic: mechanistic study

Shengming Wang, Huidi Zhang, Xiangli Shi, Qingzhu Zhang, Wenxing Wang, and Qiao Wang

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Cited articles

Almeida, J., Schobesberger, S., Kürten, A., Ortega, I. K., Kupiainen-Määttä, O., Praplan, A. P., Adamov, A., Amorim, A., Bianchi, F., and Breitenlechner, M.: Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere, Nature, 502, 359–363, https://doi.org/10.1038/nature12663, 2013. 
Arquero, K. D., Xu, J., Gerber, R. B., and Finlayson-Pitts, B. J.: Particle formation and growth from oxalic acid, methanesulfonic acid, trimethylamine and water: a combined experimental and theoretical study, Physical Chemistry Chemical Physics, 19, 28286–28301, https://doi.org/10.1039/c7cp04468b, 2017. 
Custard, K. D., Pratt, K. A., Wang, S., and Shepson, P. B.: Constraints on Arctic atmospheric chlorine production through measurements and simulations of Cl2 and ClO, Environ. Sci. Technol., 50, 12394–12400, 2016. 
Dawson, M. L., Varner, M. E., Perraud, V., Ezell, M. J., Gerber, R. B., and Finlayson-Pitts, B. J.: Simplified mechanism for new particle formation from methanesulfonic acid, amines, and water via experiments and ab initio calculations, Proceedings of the National Academy of Sciences, 109, 18719–18724, 2012. 
Ehn, M., Thornton, J. A., Kleist, E., Sipilä, M., Junninen, H., Pullinen, I., Springer, M., Rubach, F., Tillmann, R., and Lee, B.: A large source of low-volatility secondary organic aerosol, Nature, 506, 476–479, 2014. 
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Recent studies have shown that chloric acid (HClO3, CA) is prevalent in the Arctic boundary layer. However, the mechanism of CA-based nucleation is unclear. We provide molecular-level evidence that CA-dimethylamine (DMA) nucleation may not effectively contribute to Arctic new particle formation (NPF). The proposed CA-DMA nucleation mechanism may help us to deeply understand marine NPF events in the Arctic boundary layer.
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