Articles | Volume 25, issue 19
https://doi.org/10.5194/acp-25-12233-2025
https://doi.org/10.5194/acp-25-12233-2025
Review article
 | 
08 Oct 2025
Review article |  | 08 Oct 2025

Atmospheric mercury: recent advances in theoretical, computational, experimental, observational, and isotopic understanding to decipher its redox transformations in the upper and lower atmosphere and interactions with Earth surface reservoirs

Jonas O. Sommar, Xinyu Shi, Xueling Tang, Guangyi Sun, Che-Jen Lin, and Xinbin Feng

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Cited articles

Ababneh, F. A., Scott, S. L., Al-Reasi, H. A., and Lean, D. R. S.: Photochemical reduction and reoxidation of aqueous mercuric chloride in the presence of ferrioxalate and air, Sci. Total Environ., 367, 831–839, https://doi.org/10.1016/j.scitotenv.2006.02.018, 2006. 
Agnan, Y., Le Dantec, T., Moore, C. W., Edwards, G. C., and Obrist, D.: New constraints on terrestrial surface-atmosphere fluxes of gaseous elemental mercury using a global database, Environ. Sci. Technol., 50, 507–520, https://doi.org/10.1021/acs.est.5b04013, 2016. 
Ai, Y., Wang, C., Videen, G., and Pan, Y.-L.: Optically levitated, single-particle reactor for the study of surface and heterogeneous chemistry-reactions of particulate-bound mercury with ozone in air, Chem. Phys. Lett., 817, 140428, https://doi.org/10.1016/j.cplett.2023.140428, 2023. 
Akagi, H., Fujita, Y., and Tkabatake, E.: Photochemical methylation of inorganic mercuric compounds in aqueous acetic acid solutions, Nippon Kagaku Kaishi, 1974, 1180–1184, https://doi.org/10.1246/nikkashi.1974.1180, 1974. 
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Short summary
A more thorough understanding of the complex processes involved in the atmospheric Hg cycle has been achieved. The dynamics of the cycle are influenced by a rapid redox chemistry with several oxidation states and effects of multiphase interactions. This review provides a detailed analysis of the atmospheric chemistry of Hg in both the lower and the upper atmosphere, together with a synthesis of the latest kinetic, thermochemical, photochemical, and isotopic fractionation data.
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