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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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_806927 2023-05-15T13:40:18+02:00 Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt Raiswell, R. Benning, L. Tranter, M. Tulaczyk, S. 2008 https://gfzpublic.gfz-potsdam.de/pubman/item/item_806927 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1186/1467-4866-9-7 info:eu-repo/semantics/altIdentifier/pissn/1467-4866 info:eu-repo/semantics/altIdentifier/urn/<Go to ISI>://WOS:000257561700001 https://gfzpublic.gfz-potsdam.de/pubman/item/item_806927 Geochemical Transactions info:eu-repo/semantics/article 2008 ftgfzpotsdam https://doi.org/10.1186/1467-4866-9-7 2022-09-14T05:54:00Z 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. Article in Journal/Newspaper Antarc* Antarctic Iceberg* Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Southern Ocean The Antarctic Geochemical Transactions 9 1 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
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 |
Article in Journal/Newspaper |
author |
Raiswell, R. Benning, L. Tranter, M. Tulaczyk, S. |
spellingShingle |
Raiswell, R. Benning, L. Tranter, M. Tulaczyk, S. Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt |
author_facet |
Raiswell, R. Benning, L. Tranter, M. Tulaczyk, S. |
author_sort |
Raiswell, R. |
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 |
publishDate |
2008 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_806927 |
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_source |
Geochemical Transactions |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1186/1467-4866-9-7 info:eu-repo/semantics/altIdentifier/pissn/1467-4866 info:eu-repo/semantics/altIdentifier/urn/<Go to ISI>://WOS:000257561700001 https://gfzpublic.gfz-potsdam.de/pubman/item/item_806927 |
op_doi |
https://doi.org/10.1186/1467-4866-9-7 |
container_title |
Geochemical Transactions |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766132017624252416 |