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Showing 1–10 of 10 results
Advanced filters: Author: Jemma L. Wadham Clear advanced filters

  • Glacial meltwaters may help fertilize the iron-limited Polar Oceans, yet the contribution is poorly constrained. Hawkings et al.monitor iron fluxes during a full-melt season in Greenland, and propose that ice sheets provide highly reactive and potentially bioavailable iron, comparable with aeolian dust fluxes.

    • Jon R. Hawkings
    • Jemma L. Wadham
    • Jon Telling
    ResearchOpen Access
    Nature Communications
    Volume: 5, P: 1-8

  • Far from frozen and sterile environments, glaciers are biogeochemical reactors and regulators. This Review outlines key biogeochemical and associated physical processes occurring in glacierized environments and the known impacts of glaciers on elemental cycling and the Earth system.

    • Jon. R. Hawkings
    • James A. Bradley
    • Maya P. Bhatia
    Reviews
    Nature Reviews Earth & Environment
    P: 1-20

  • Glacial systems are important sources of dissolved organic carbon to downstream ecosystems. Observations of carbon dynamics on the Greenland ice sheet reveal substantial melt season production and export of microbial dissolved organic carbon.

    • Michaela Musilova
    • Martyn Tranter
    • Alexandre M. Anesio
    Research
    Nature Geoscience
    Volume: 10, P: 360-365

  • Meltwaters from the southwestern margin of the Greenland Ice Sheet contain exceptionally high concentrations of mercury, exporting up to more than 200 kmol of dissolved mercury every year, suggest mercury measurements from three glacial catchments.

    • Jon R. Hawkings
    • Benjamin S. Linhoff
    • Robert G. M. Spencer
    ResearchOpen Access
    Nature Geoscience
    Volume: 14, P: 496-502

  • The role ice sheets play in the silica cycle over glacial−interglacial timescales remains unclear. Here, based on the measurement of silica isotopes in Greenland meltwater and a nearby marine sediment core, the authors suggest expanding ice sheets considerably increased isotopically light silica in the oceans.

    • Jon R. Hawkings
    • Jade E. Hatton
    • Martyn Tranter
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-10

  • Glacial runoff often has relatively low dissolved silica concentrations and therefore ice sheets have been thought insignificant in the global silicon cycle. Here, the authors show that ice sheets likely play an important role in the production and export of dissolved and dissolvable amorphous silica downstream.

    • Jon R. Hawkings
    • Jemma L. Wadham
    • Rob Raiswell
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-10

  • Subglacially produced methane of microbial origin is flushed to the ice margin of the Greenland ice sheet by meltwater, contributing to a previously unaccounted for methane flux to the atmosphere.

    • Guillaume Lamarche-Gagnon
    • Jemma L. Wadham
    • Marek Stibal
    Research
    Nature
    Volume: 565, P: 73-77

  • Glacial weathering is a significant source of dissolved silicon to coastal waters, supporting diatom growth in polar ecosystems, according to a review of the stable and radioisotope measurements alongside biogeochemical modeling to understand subglacial silica mobilization and its cycling across the land-ocean continuum.

    • Katharine R. Hendry
    • Felipe Sales de Freitas
    • E. Malcolm S. Woodward
    ReviewsOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-12