Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt
Productivity in the Southern Oceans is iron-limited, and the supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine reservoir. Glacial sediment sources of iron have rarely been considered, as the iron has been assumed to be inert and non-bioavailable. Th...
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ftpubmed:oai:pubmedcentral.nih.gov:2440735 2023-05-15T14:02:22+02:00 Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt Raiswell, Rob Benning, Liane G Tranter, Martyn Tulaczyk, Slawek 2008-05-30 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440735 http://www.ncbi.nlm.nih.gov/pubmed/18513396 https://doi.org/10.1186/1467-4866-9-7 en eng BioMed Central http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440735 http://www.ncbi.nlm.nih.gov/pubmed/18513396 http://dx.doi.org/10.1186/1467-4866-9-7 Copyright © 2008 Raiswell et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Research Article Text 2008 ftpubmed https://doi.org/10.1186/1467-4866-9-7 2013-09-02T00:59:08Z Productivity in the Southern Oceans is iron-limited, and the supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine reservoir. Glacial sediment sources of iron have rarely been considered, as the iron has been assumed to be inert and non-bioavailable. This study demonstrates the presence of potentially bioavailable Fe as ferrihydrite and goethite in nanoparticulate clusters, in sediments collected from icebergs in the Southern Ocean and glaciers on the Antarctic landmass. Nanoparticles in ice can be transported by icebergs away from coastal regions in the Southern Ocean, enabling melting to release bioavailable Fe to the open ocean. The abundance of nanoparticulate iron has been measured by an ascorbate extraction. This data indicates that the fluxes of bioavailable iron supplied to the Southern Ocean from aeolian dust (0.01–0.13 Tg yr-1) and icebergs (0.06–0.12 Tg yr-1) are comparable. Increases in iceberg production thus have the capacity to increase productivity and this newly identified negative feedback may help to mitigate fossil fuel emissions. Text Antarc* Antarctic Iceberg* Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean The Antarctic Geochemical Transactions 9 1 |
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Research Article Raiswell, Rob Benning, Liane G Tranter, Martyn Tulaczyk, Slawek Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
topic_facet |
Research Article |
description |
Productivity in the Southern Oceans is iron-limited, and the supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine reservoir. Glacial sediment sources of iron have rarely been considered, as the iron has been assumed to be inert and non-bioavailable. This study demonstrates the presence of potentially bioavailable Fe as ferrihydrite and goethite in nanoparticulate clusters, in sediments collected from icebergs in the Southern Ocean and glaciers on the Antarctic landmass. Nanoparticles in ice can be transported by icebergs away from coastal regions in the Southern Ocean, enabling melting to release bioavailable Fe to the open ocean. The abundance of nanoparticulate iron has been measured by an ascorbate extraction. This data indicates that the fluxes of bioavailable iron supplied to the Southern Ocean from aeolian dust (0.01–0.13 Tg yr-1) and icebergs (0.06–0.12 Tg yr-1) are comparable. Increases in iceberg production thus have the capacity to increase productivity and this newly identified negative feedback may help to mitigate fossil fuel emissions. |
format |
Text |
author |
Raiswell, Rob Benning, Liane G Tranter, Martyn Tulaczyk, Slawek |
author_facet |
Raiswell, Rob Benning, Liane G Tranter, Martyn Tulaczyk, Slawek |
author_sort |
Raiswell, Rob |
title |
Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
title_short |
Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
title_full |
Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
title_fullStr |
Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
title_full_unstemmed |
Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
title_sort |
bioavailable iron in the southern ocean: the significance of the iceberg conveyor belt |
publisher |
BioMed Central |
publishDate |
2008 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440735 http://www.ncbi.nlm.nih.gov/pubmed/18513396 https://doi.org/10.1186/1467-4866-9-7 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Iceberg* Southern Ocean |
genre_facet |
Antarc* Antarctic Iceberg* Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440735 http://www.ncbi.nlm.nih.gov/pubmed/18513396 http://dx.doi.org/10.1186/1467-4866-9-7 |
op_rights |
Copyright © 2008 Raiswell et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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CC-BY |
op_doi |
https://doi.org/10.1186/1467-4866-9-7 |
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Geochemical Transactions |
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9 |
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1 |
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1766272600809406464 |