Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords
Benthic iron (Fe) fluxes from continental shelf sediments are an important source of Fe to the global ocean, yet the magnitude of these fluxes is not well constrained. Processing of Fe in sediments is of particular importance in the Arctic Ocean, which has a large shelf area and Fe limitation of pri...
Published in: | Limnology and Oceanography |
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Online Access: | https://oceanrep.geomar.de/id/eprint/53480/ https://oceanrep.geomar.de/id/eprint/53480/8/lno11885-sup-0001-supinfo01.docx https://oceanrep.geomar.de/id/eprint/53480/9/lno11885-sup-0002-supinfo02.csv https://oceanrep.geomar.de/id/eprint/53480/16/lno.11885.pdf https://doi.org/10.1002/lno.11885 |
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ftoceanrep:oai:oceanrep.geomar.de:53480 2024-02-11T09:59:43+01:00 Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords Herbert, Lisa C. Zhu, Qingzhi Michaud, Alexander B. Laufer-Meiser, Katja Jones, Christopher K. Riedinger, Natascha Stooksbury, Zachery S. Aller, Robert C. Jørgensen, Bo Barker Wehrmann, Laura M. 2021-09 text https://oceanrep.geomar.de/id/eprint/53480/ https://oceanrep.geomar.de/id/eprint/53480/8/lno11885-sup-0001-supinfo01.docx https://oceanrep.geomar.de/id/eprint/53480/9/lno11885-sup-0002-supinfo02.csv https://oceanrep.geomar.de/id/eprint/53480/16/lno.11885.pdf https://doi.org/10.1002/lno.11885 en eng ASLO Wiley https://oceanrep.geomar.de/id/eprint/53480/8/lno11885-sup-0001-supinfo01.docx https://oceanrep.geomar.de/id/eprint/53480/9/lno11885-sup-0002-supinfo02.csv https://oceanrep.geomar.de/id/eprint/53480/16/lno.11885.pdf Herbert, L. C., Zhu, Q., Michaud, A. B., Laufer-Meiser, K., Jones, C. K., Riedinger, N., Stooksbury, Z. S., Aller, R. C., Jørgensen, B. B. and Wehrmann, L. M. (2021) Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords. Limnology and Oceanography, 66 (9). pp. 3374-3392. DOI 10.1002/lno.11885 <https://doi.org/10.1002/lno.11885>. doi:10.1002/lno.11885 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1002/lno.11885 2024-01-15T00:23:45Z Benthic iron (Fe) fluxes from continental shelf sediments are an important source of Fe to the global ocean, yet the magnitude of these fluxes is not well constrained. Processing of Fe in sediments is of particular importance in the Arctic Ocean, which has a large shelf area and Fe limitation of primary productivity. In the Arctic fjords of Svalbard, glacial weathering delivers high volumes of Fe-rich sediment to the fjord benthos. Benthic redox cycling of Fe proceeds through multiple pathways of reduction (i.e., dissimilatory iron reduction and reduction by hydrogen sulfide) and re-oxidation. There are few estimates of the magnitude and controlling factors of the benthic Fe flux in Arctic fjords. We collected cores from two Svalbard fjords (Kongsfjorden and Lilliehöökfjorden), measured dissolved Fe2+ concentrations using a two-dimensional sensor, and analyzed iron, manganese, carbon, and sulfur species to study benthic Fe fluxes. Benthic fluxes of Fe2+ vary throughout the fjords, with a “sweet spot” mid-fjord controlled by the availability of organic carbon linked to sedimentation rates. The flux is also impacted by fjord circulation and sea ice cover, which influence overall mineralization rates in the sediment. Due to ongoing Arctic warming, we predict an increase in the benthic Fe2+ flux with reduced sea ice cover in some fjords and a decrease in the Fe2+ flux with the retreat of tidewater glaciers in other regions. Decreasing benthic Fe2+ fluxes in fjords may exacerbate Fe limitation of primary productivity in the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Lilliehöökfjorden ENVELOPE(11.661,11.661,79.264,79.264) Svalbard Limnology and Oceanography |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Benthic iron (Fe) fluxes from continental shelf sediments are an important source of Fe to the global ocean, yet the magnitude of these fluxes is not well constrained. Processing of Fe in sediments is of particular importance in the Arctic Ocean, which has a large shelf area and Fe limitation of primary productivity. In the Arctic fjords of Svalbard, glacial weathering delivers high volumes of Fe-rich sediment to the fjord benthos. Benthic redox cycling of Fe proceeds through multiple pathways of reduction (i.e., dissimilatory iron reduction and reduction by hydrogen sulfide) and re-oxidation. There are few estimates of the magnitude and controlling factors of the benthic Fe flux in Arctic fjords. We collected cores from two Svalbard fjords (Kongsfjorden and Lilliehöökfjorden), measured dissolved Fe2+ concentrations using a two-dimensional sensor, and analyzed iron, manganese, carbon, and sulfur species to study benthic Fe fluxes. Benthic fluxes of Fe2+ vary throughout the fjords, with a “sweet spot” mid-fjord controlled by the availability of organic carbon linked to sedimentation rates. The flux is also impacted by fjord circulation and sea ice cover, which influence overall mineralization rates in the sediment. Due to ongoing Arctic warming, we predict an increase in the benthic Fe2+ flux with reduced sea ice cover in some fjords and a decrease in the Fe2+ flux with the retreat of tidewater glaciers in other regions. Decreasing benthic Fe2+ fluxes in fjords may exacerbate Fe limitation of primary productivity in the Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Herbert, Lisa C. Zhu, Qingzhi Michaud, Alexander B. Laufer-Meiser, Katja Jones, Christopher K. Riedinger, Natascha Stooksbury, Zachery S. Aller, Robert C. Jørgensen, Bo Barker Wehrmann, Laura M. |
spellingShingle |
Herbert, Lisa C. Zhu, Qingzhi Michaud, Alexander B. Laufer-Meiser, Katja Jones, Christopher K. Riedinger, Natascha Stooksbury, Zachery S. Aller, Robert C. Jørgensen, Bo Barker Wehrmann, Laura M. Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
author_facet |
Herbert, Lisa C. Zhu, Qingzhi Michaud, Alexander B. Laufer-Meiser, Katja Jones, Christopher K. Riedinger, Natascha Stooksbury, Zachery S. Aller, Robert C. Jørgensen, Bo Barker Wehrmann, Laura M. |
author_sort |
Herbert, Lisa C. |
title |
Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
title_short |
Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
title_full |
Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
title_fullStr |
Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
title_full_unstemmed |
Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords |
title_sort |
benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in arctic fjords |
publisher |
ASLO |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/53480/ https://oceanrep.geomar.de/id/eprint/53480/8/lno11885-sup-0001-supinfo01.docx https://oceanrep.geomar.de/id/eprint/53480/9/lno11885-sup-0002-supinfo02.csv https://oceanrep.geomar.de/id/eprint/53480/16/lno.11885.pdf https://doi.org/10.1002/lno.11885 |
long_lat |
ENVELOPE(11.661,11.661,79.264,79.264) |
geographic |
Arctic Arctic Ocean Lilliehöökfjorden Svalbard |
geographic_facet |
Arctic Arctic Ocean Lilliehöökfjorden Svalbard |
genre |
Arctic Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard |
genre_facet |
Arctic Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard |
op_relation |
https://oceanrep.geomar.de/id/eprint/53480/8/lno11885-sup-0001-supinfo01.docx https://oceanrep.geomar.de/id/eprint/53480/9/lno11885-sup-0002-supinfo02.csv https://oceanrep.geomar.de/id/eprint/53480/16/lno.11885.pdf Herbert, L. C., Zhu, Q., Michaud, A. B., Laufer-Meiser, K., Jones, C. K., Riedinger, N., Stooksbury, Z. S., Aller, R. C., Jørgensen, B. B. and Wehrmann, L. M. (2021) Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords. Limnology and Oceanography, 66 (9). pp. 3374-3392. DOI 10.1002/lno.11885 <https://doi.org/10.1002/lno.11885>. doi:10.1002/lno.11885 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/lno.11885 |
container_title |
Limnology and Oceanography |
_version_ |
1790595494548865024 |