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  • Mercury fluxes from hydrothermal venting at mid-ocean ridges constrained by measurements
    Torres-Rodriguez, Natalia ...
    Methylmercury is a potent toxin threatening the global population mainly through the consumption of marine fsh. Hydrothermal venting directly delivers natural mercury to the ocean, yet its global fux ... remains poorly constrained. To determine the extent to which anthropogenic inputs have increased oceanic mercury levels, it is crucial to estimate natural mercury levels. Here we combine observations of vent fuids, plume waters, seawater and rock samples to quantify the release of mercury from the Trans-Atlantic Geotraverse hydrothermal vent at the Mid-Atlantic Ridge. The majority (67–95%) of the mercury enriched in the vent fuids (4,966 ± 497 pmol l−1) is rapidly diluted to reach background seawater levels (0.80 pmol l−1). A small Hg fraction (2.6–10%) is scavenged to the Trans-Atlantic Geotraverse mound rocks. Scaling up our fndings and previous work, we propose a mercury fux estimate of 1.5–64.7 t per year from mid-ocean ridges. This hydrothermal fux is small in comparison to anthropogenic inputs. This suggests that most of the mercury present in the ocean must be of anthropogenic origin and that the implementation of emissions reduction measures outlined in the Minamata Convention could efectively reduce mercury levels in the global ocean and subsequently in marine fsh.
    Vir: Nature geoscience. - ISSN 1752-0894 (Jan. 2024, str. 51–57)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2024
    Jezik - angleški
    COBISS.SI-ID - 177085187

    Povezava(-e):

    https://www.nature.com/articles/s41561-023-01341-w
    DOI

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