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<p>Glacier retreat, a consequence of climate warming, raises concerns about the release of tracemetals previously locked within ice, yet the global patterns and governing mechanisms of their mobilization remain unclear. Here we present dissolved trace&#xa0;metal data from 14 mountain glaciers and 2 polar ice sheets to quantify how glacier-type governs elemental mobilization. Both glacier classes release meltwaters with concentrations that often exceed global riverine and open-ocean means by one to two orders of magnitude, yet their chemical signatures differ. Mountain-glacier meltwaters are enriched in essential micronutrients such as Zn, Co, Ni, Cd, and Cu relative to ice sheets. These disparities reflect enhanced weathering, lithological diversity, and greater availability of freshly ground particles in alpine systems. These fluxes fertilize nutrient-limited ecosystems yet also elevate metal toxicity. This contrast underscores that differences between glacier type will determine how ice loss reshapes the future balance between micronutrient supply and contaminant release under accelerating glacier and ice-sheet retreat.</p>

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Glacier-specific controls on enhanced trace metal mobility across global mountain and polar meltwaters

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月28日

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  • Shipika Sundriyal,
  • Tanuj Shukla,
  • Shichang Kang,
  • Yulang Zhang,
  • Rajesh Singh,
  • Uday Bhan,
  • D. P. Dobhal

摘要

Glacier retreat, a consequence of climate warming, raises concerns about the release of tracemetals previously locked within ice, yet the global patterns and governing mechanisms of their mobilization remain unclear. Here we present dissolved trace metal data from 14 mountain glaciers and 2 polar ice sheets to quantify how glacier-type governs elemental mobilization. Both glacier classes release meltwaters with concentrations that often exceed global riverine and open-ocean means by one to two orders of magnitude, yet their chemical signatures differ. Mountain-glacier meltwaters are enriched in essential micronutrients such as Zn, Co, Ni, Cd, and Cu relative to ice sheets. These disparities reflect enhanced weathering, lithological diversity, and greater availability of freshly ground particles in alpine systems. These fluxes fertilize nutrient-limited ecosystems yet also elevate metal toxicity. This contrast underscores that differences between glacier type will determine how ice loss reshapes the future balance between micronutrient supply and contaminant release under accelerating glacier and ice-sheet retreat.