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Near surface oxidation of elemental mercury leads to mercury exposure in the Arctic Ocean biota

Author

Listed:
  • Seung Hyeon Lim

    (Nam-Gu)

  • Younggwang Kim

    (Nam-Gu)

  • Laura C. Motta

    (Woods Hole Oceanographic Institution)

  • Eun Jin Yang

    (Korea Polar Research Institute)

  • Tae Siek Rhee

    (Korea Polar Research Institute)

  • Jong Kuk Hong

    (Korea Polar Research Institute)

  • Seunghee Han

    (Gwangju Institute of Science and Technology (GIST))

  • Sae Yun Kwon

    (Nam-Gu)

Abstract

Atmospheric mercury (Hg(0), Hg(II)) and riverine exported Hg (Hg(II)) are proposed as important Hg sources to the Arctic Ocean. As plankton cannot passively uptake Hg(0), gaseous Hg(0) has to be oxidized to be bioavailable. Here, we measured Hg isotope ratios in zooplankton, Arctic cod, total gaseous Hg, sediment, seawater, and snowpack from the Bering Strait, the Chukchi Sea, and the Beaufort Sea. The Δ200Hg, used to differentiate between Hg(0) and Hg(II), shows, on average, 70% of Hg(0) in all biota and differs with seawater Δ200Hg (Hg(II)). Since Δ200Hg anomalies occur via tropospheric Hg(0) oxidation, we propose that near-surface Hg(0) oxidation via terrestrial vegetation, coastally evaded halogens, and sea salt aerosols, which preserve Δ200Hg of Hg(0) upon oxidation, supply bioavailable Hg(II) pools in seawater. Our study highlights sources and pathways in which Hg(0) poses potential ecological risks to the Arctic Ocean biota.

Suggested Citation

  • Seung Hyeon Lim & Younggwang Kim & Laura C. Motta & Eun Jin Yang & Tae Siek Rhee & Jong Kuk Hong & Seunghee Han & Sae Yun Kwon, 2024. "Near surface oxidation of elemental mercury leads to mercury exposure in the Arctic Ocean biota," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51852-2
    DOI: 10.1038/s41467-024-51852-2
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