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

Katja Laufer-Meiser; Alexander B. Michaud; Markus Maisch; James M. Byrne; Andreas Kappler; Molly O. Patterson; Hans Røy; Bo Barker Jørgensen

doi:10.1038/s41467-021-21558-w

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

Katja Laufer-Meiser^*, Alexander B. Michaud, Markus Maisch, James M. Byrne, Andreas Kappler, Molly O. Patterson, Hans Røy, Bo Barker Jørgensen

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

32 Citationer (Scopus)

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.

Originalsprog	Engelsk
Artikelnummer	1349
Tidsskrift	Nature Communications
Vol/bind	12
Nummer	1
Antal sider	13
ISSN	2041-1723
DOI	https://doi.org/10.1038/s41467-021-21558-w
Status	Udgivet - mar. 2021

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10.1038/s41467-021-21558-wLicens: CC BY

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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.",

author = "Katja Laufer-Meiser and Michaud, {Alexander B.} and Markus Maisch and Byrne, {James M.} and Andreas Kappler and Patterson, {Molly O.} and Hans R{\o}y and J{\o}rgensen, {Bo Barker}",

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AU - Laufer-Meiser, Katja

AU - Michaud, Alexander B.

AU - Maisch, Markus

AU - Byrne, James M.

AU - Kappler, Andreas

AU - Patterson, Molly O.

AU - Røy, Hans

AU - Jørgensen, Bo Barker

PY - 2021/3

Y1 - 2021/3

N2 - 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.

AB - 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.

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

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