Benthic iron flux influenced by climate‐sensitive interplay between organic carbon availability and sedimentation rate in Arctic fjords
Abstract 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 limitati...
Published in: | Limnology and Oceanography |
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Online Access: | http://dx.doi.org/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 |
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crwiley:10.1002/lno.11885 2024-03-31T07:50:15+00:00 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. Stony Brook University Sigma Xia European Research Council Danmarks Grundforskningsfond Deutsche Forschungsgemeinschaft National Science Foundation 2021 http://dx.doi.org/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 66, issue 9, page 3374-3392 ISSN 0024-3590 1939-5590 Aquatic Science Oceanography journal-article 2021 crwiley https://doi.org/10.1002/lno.11885 2024-03-04T13:01:43Z Abstract 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 Fe 2+ concentrations using a two‐dimensional sensor, and analyzed iron, manganese, carbon, and sulfur species to study benthic Fe fluxes. Benthic fluxes of Fe 2+ 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 Fe 2+ flux with reduced sea ice cover in some fjords and a decrease in the Fe 2+ flux with the retreat of tidewater glaciers in other regions. Decreasing benthic Fe 2+ fluxes in fjords may exacerbate Fe limitation of primary productivity in the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard Wiley Online Library Arctic Arctic Ocean Svalbard Lilliehöökfjorden ENVELOPE(11.661,11.661,79.264,79.264) Limnology and Oceanography |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Oceanography |
spellingShingle |
Aquatic Science Oceanography 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 |
topic_facet |
Aquatic Science Oceanography |
description |
Abstract 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 Fe 2+ concentrations using a two‐dimensional sensor, and analyzed iron, manganese, carbon, and sulfur species to study benthic Fe fluxes. Benthic fluxes of Fe 2+ 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 Fe 2+ flux with reduced sea ice cover in some fjords and a decrease in the Fe 2+ flux with the retreat of tidewater glaciers in other regions. Decreasing benthic Fe 2+ fluxes in fjords may exacerbate Fe limitation of primary productivity in the Arctic Ocean. |
author2 |
Stony Brook University Sigma Xia European Research Council Danmarks Grundforskningsfond Deutsche Forschungsgemeinschaft National Science Foundation |
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. |
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 |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.11885 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11885 |
long_lat |
ENVELOPE(11.661,11.661,79.264,79.264) |
geographic |
Arctic Arctic Ocean Svalbard Lilliehöökfjorden |
geographic_facet |
Arctic Arctic Ocean Svalbard Lilliehöökfjorden |
genre |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard |
genre_facet |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Sea ice Svalbard |
op_source |
Limnology and Oceanography volume 66, issue 9, page 3374-3392 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11885 |
container_title |
Limnology and Oceanography |
_version_ |
1795028419703996416 |