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<p>The Greenland Ice Sheet (GrIS) is a poorly constrained source of mercury (Hg) to Arctic ecosystems. We measured Hg concentrations and stable isotopes along an ice-to-ocean continuum to identify controls on GrIS Hg export. Early-season permafrost melt and rainfall produced high filtered total mercury (fTHg, ~17 pM) and monomethylmercury (MMHg, ~2 pM). As subglacial drainage evolved, particulate Hg doubled (from ~8 to 17 pM) and MMHg production remained elevated, indicating Hg mobilization from subglacial environments. Shifts in Hg stable isotope ratios and <InlineEquation ID="IEq1"><EquationSource Format="TEX">\(\Delta\)</EquationSource><EquationSource Format="MATHML"><math><mi mathvariant="normal">Δ</mi></math></EquationSource></InlineEquation><sup>199</sup>Hg mass balance show supraglacial sources contribute 20–48% of exported Hg, suggesting subglacial inputs dominate the seasonal Hg flux. Fjord waters were enriched in fTHg ( ~ 10 pM) and MMHg ( ~ 2 pM) relative to rivers, consistent with particulate Hg transformations and terrestrial Hg inputs. The estimated GrIS Hg yield ( ~ 23 mmol km<sup>−2</sup> yr<sup>−1</sup>) is similar to that of Arctic rivers and will likely increase with climate-driven mass loss.</p>

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Mercury mobilization and export from the Greenland Ice Sheet using an ice-to-ocean approach

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月16日

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  • Amina N. Youssef,
  • Sarah E. Janssen,
  • Carl Lamborg,
  • Michael T. Tate,
  • Marissa Despins,
  • Eva L. Doting,
  • Brett A. Poulin,
  • David McCabe,
  • Leah M. Hopf,
  • Emma K. Ferrer,
  • Abe Doroshow,
  • Guillaume Lamarche-Gagnon,
  • Ian Delaney,
  • Marjolein Gevers,
  • Jade Hatton,
  • Iris Kubler-Dudgeon,
  • Jack G. Murphy,
  • Amina T. Schartup,
  • Marek Stibal,
  • Johannes West,
  • Jon R. Hawkings

摘要

The Greenland Ice Sheet (GrIS) is a poorly constrained source of mercury (Hg) to Arctic ecosystems. We measured Hg concentrations and stable isotopes along an ice-to-ocean continuum to identify controls on GrIS Hg export. Early-season permafrost melt and rainfall produced high filtered total mercury (fTHg, ~17 pM) and monomethylmercury (MMHg, ~2 pM). As subglacial drainage evolved, particulate Hg doubled (from ~8 to 17 pM) and MMHg production remained elevated, indicating Hg mobilization from subglacial environments. Shifts in Hg stable isotope ratios and \(\Delta\)Δ199Hg mass balance show supraglacial sources contribute 20–48% of exported Hg, suggesting subglacial inputs dominate the seasonal Hg flux. Fjord waters were enriched in fTHg ( ~ 10 pM) and MMHg ( ~ 2 pM) relative to rivers, consistent with particulate Hg transformations and terrestrial Hg inputs. The estimated GrIS Hg yield ( ~ 23 mmol km−2 yr−1) is similar to that of Arctic rivers and will likely increase with climate-driven mass loss.