Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 13
Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9809-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-9809-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 13
Research article
 | 
13 Jul 2026
Research article |  | 13 Jul 2026

Development of iron-mediated molecular chlorine chemistry in GEOS-Chem: model description, evaluation and global atmospheric implication

Jing Chen, Xianyi Sun, Chuang Qin, Jie Li, Qianjie Chen, and Xiao Fu

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Short summary
By incorporating an iron-mediated molecular chlorine (Cl2) formation pathway into the GEOS-Chem global atmospheric chemistry transport model, simulated surface Cl2 concentrations align better with observations. Reactive chlorine species increase substantially, thereby altering atmospheric oxidative capacity. Stronger oxidation elevates PM2.5 levels in polluted regions, especially in winter, underscoring the need to consider iron–halogen coupling chemistry in future air-quality mitigation.
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