Articles | Volume 24, issue 16
https://doi.org/10.5194/acp-24-9615-2024
https://doi.org/10.5194/acp-24-9615-2024
Research article
 | 
30 Aug 2024
Research article |  | 30 Aug 2024

Elevated oxidized mercury in the free troposphere: analytical advances and application at a remote continental mountaintop site

Eleanor J. Derry, Tyler R. Elgiar, Taylor Y. Wilmot, Nicholas W. Hoch, Noah S. Hirshorn, Peter Weiss-Penzias, Christopher F. Lee, John C. Lin, A. Gannet Hallar, Rainer Volkamer, Seth N. Lyman, and Lynne E. Gratz

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Mercury (Hg) is a globally distributed neurotoxic pollutant. Atmospheric deposition is the main source of Hg in ecosystems. However, measurement biases hinder understanding of the origins and abundance of the more bioavailable oxidized form. We used an improved, calibrated measurement system to study air mass composition and transport of atmospheric Hg at a remote mountaintop site in the central US. Oxidized Hg originated upwind in the low to middle free troposphere under clean, dry conditions.
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