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Potentially bioavailable iron produced through benthic cycling in glaciated Arctic fjords of Svalbard

Author

Listed:
  • Katja Laufer-Meiser

    (Aarhus University
    GEOMAR, Helmholtz Centre for Ocean Research Kiel)

  • Alexander B. Michaud

    (Aarhus University
    Bigelow Laboratory for Ocean Sciences)

  • Markus Maisch

    (University of Tübingen)

  • James M. Byrne

    (University of Tübingen
    University of Bristol, Wills Memorial Building)

  • Andreas Kappler

    (University of Tübingen
    GEOMAR, Helmholtz Centre for Ocean Research Kiel)

  • Molly O. Patterson

    (Binghamton University)

  • Hans Røy

    (Aarhus University)

  • Bo Barker Jørgensen

    (Aarhus University)

Abstract

The Arctic has the highest warming rates on Earth. Glaciated fjord ecosystems, which are hotspots of carbon cycling and burial, are extremely sensitive to this warming. Glaciers are important for the transport of iron from land to sea and supply this essential nutrient to phytoplankton in high-latitude marine ecosystems. However, up to 95% of the glacially-sourced iron settles to sediments close to the glacial source. Our data show that while 0.6–12% of the total glacially-sourced iron is potentially bioavailable, biogeochemical cycling in Arctic fjord sediments converts the glacially-derived iron into more labile phases, generating up to a 9-fold increase in the amount of potentially bioavailable iron. Arctic fjord sediments are thus an important source of potentially bioavailable iron. However, our data suggests that as glaciers retreat onto land the flux of iron to the sediment-water interface may be reduced. Glacial retreat therefore likely impacts iron cycling in coastal marine ecosystems.

Suggested Citation

  • Katja Laufer-Meiser & Alexander B. Michaud & Markus Maisch & James M. Byrne & Andreas Kappler & Molly O. Patterson & Hans Røy & Bo Barker Jørgensen, 2021. "Potentially bioavailable iron produced through benthic cycling in glaciated Arctic fjords of Svalbard," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21558-w
    DOI: 10.1038/s41467-021-21558-w
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