Articles | Volume 25, issue 17
https://doi.org/10.5194/acp-25-9645-2025
https://doi.org/10.5194/acp-25-9645-2025
Research article
 | 
01 Sep 2025
Research article |  | 01 Sep 2025

Constraining elemental mercury air–sea exchange using long-term ground-based observations

Koketso M. Molepo, Johannes Bieser, Alkuin M. Koenig, Ian M. Hedgecock, Ralf Ebinghaus, Aurélien Dommergue, Olivier Magand, Hélène Angot, Oleg Travnikov, Lynwill Martin, Casper Labuschagne, Katie Read, and Yann Bertrand

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Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3722', Anonymous Referee #1, 23 Dec 2024
    • AC2: 'Reply on RC1', Koketso Molepo, 04 Apr 2025
  • RC2: 'Comment on egusphere-2024-3722', Anonymous Referee #2, 29 Dec 2024
    • AC1: 'Reply on RC2', Koketso Molepo, 04 Apr 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Koketso Molepo on behalf of the Authors (04 Apr 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (09 Apr 2025) by Leiming Zhang
RR by Anonymous Referee #1 (25 Apr 2025)
ED: Publish as is (20 May 2025) by Leiming Zhang
AR by Koketso Molepo on behalf of the Authors (24 May 2025)
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Short summary
Mercury exchange between the ocean and atmosphere is poorly understood due to limited in situ data. Here, using atmospheric mercury observations from ground-based monitoring stations along with air mass trajectories, we found that atmospheric Hg levels increase with air mass ocean exposure time, matching predictions for ocean Hg emissions. This finding indicates that ocean emissions directly influence atmospheric Hg levels and enables us to estimate these emissions on a global scale.
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