Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans
Iceberg-hosted sediments and atmospheric dust transport potentially bioavailable iron to the Arctic and Southern oceans as ferrihydrite. Ferrihydrite is nanoparticulate and more soluble, as well as potentially more bioavailable, than other iron (oxyhydr)oxide minerals (lepidocrocite, goethite, and h...
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ftcopernicus:oai:publications.copernicus.org:bg49501 2023-05-15T14:51:37+02:00 Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans Raiswell, Robert Hawkings, Jon R. Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon W. Wadham, Jemma Tranter, Martyn 2018-09-27 application/pdf https://doi.org/10.5194/bg-13-3887-2016 https://www.biogeosciences.net/13/3887/2016/ eng eng doi:10.5194/bg-13-3887-2016 https://www.biogeosciences.net/13/3887/2016/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-13-3887-2016 2019-12-24T09:52:10Z Iceberg-hosted sediments and atmospheric dust transport potentially bioavailable iron to the Arctic and Southern oceans as ferrihydrite. Ferrihydrite is nanoparticulate and more soluble, as well as potentially more bioavailable, than other iron (oxyhydr)oxide minerals (lepidocrocite, goethite, and hematite). A suite of more than 50 iceberg-hosted sediments contain a mean content of 0.076 wt % Fe as ferrihydrite, which produces iceberg-hosted Fe fluxes ranging from 0.7 to 5.5 and 3.2 to 25 Gmoles yr −1 to the Arctic and Southern oceans respectively. Atmospheric dust (with little or no combustion products) contains a mean ferrihydrite Fe content of 0.038 wt % (corresponding to a fractional solubility of ∼ 1 %) and delivers much smaller Fe fluxes (0.02–0.07 Gmoles yr −1 to the Arctic Ocean and 0.0–0.02 Gmoles yr −1 to the Southern Ocean). New dust flux data show that most atmospheric dust is delivered to sea ice where exposure to melting/re-freezing cycles may enhance fractional solubility, and thus fluxes, by a factor of approximately 2.5. Improved estimates for these particulate sources require additional data for the iceberg losses during fjord transit, the sediment content of icebergs, and samples of atmospheric dust delivered to the polar regions. Text Arctic Arctic Ocean Iceberg* Sea ice Southern Ocean Copernicus Publications: E-Journals Arctic Arctic Ocean Southern Ocean Biogeosciences 13 13 3887 3900 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Iceberg-hosted sediments and atmospheric dust transport potentially bioavailable iron to the Arctic and Southern oceans as ferrihydrite. Ferrihydrite is nanoparticulate and more soluble, as well as potentially more bioavailable, than other iron (oxyhydr)oxide minerals (lepidocrocite, goethite, and hematite). A suite of more than 50 iceberg-hosted sediments contain a mean content of 0.076 wt % Fe as ferrihydrite, which produces iceberg-hosted Fe fluxes ranging from 0.7 to 5.5 and 3.2 to 25 Gmoles yr −1 to the Arctic and Southern oceans respectively. Atmospheric dust (with little or no combustion products) contains a mean ferrihydrite Fe content of 0.038 wt % (corresponding to a fractional solubility of ∼ 1 %) and delivers much smaller Fe fluxes (0.02–0.07 Gmoles yr −1 to the Arctic Ocean and 0.0–0.02 Gmoles yr −1 to the Southern Ocean). New dust flux data show that most atmospheric dust is delivered to sea ice where exposure to melting/re-freezing cycles may enhance fractional solubility, and thus fluxes, by a factor of approximately 2.5. Improved estimates for these particulate sources require additional data for the iceberg losses during fjord transit, the sediment content of icebergs, and samples of atmospheric dust delivered to the polar regions. |
format |
Text |
author |
Raiswell, Robert Hawkings, Jon R. Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon W. Wadham, Jemma Tranter, Martyn |
spellingShingle |
Raiswell, Robert Hawkings, Jon R. Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon W. Wadham, Jemma Tranter, Martyn Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
author_facet |
Raiswell, Robert Hawkings, Jon R. Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon W. Wadham, Jemma Tranter, Martyn |
author_sort |
Raiswell, Robert |
title |
Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
title_short |
Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
title_full |
Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
title_fullStr |
Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
title_full_unstemmed |
Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
title_sort |
potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-13-3887-2016 https://www.biogeosciences.net/13/3887/2016/ |
geographic |
Arctic Arctic Ocean Southern Ocean |
geographic_facet |
Arctic Arctic Ocean Southern Ocean |
genre |
Arctic Arctic Ocean Iceberg* Sea ice Southern Ocean |
genre_facet |
Arctic Arctic Ocean Iceberg* Sea ice Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-13-3887-2016 https://www.biogeosciences.net/13/3887/2016/ |
op_doi |
https://doi.org/10.5194/bg-13-3887-2016 |
container_title |
Biogeosciences |
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13 |
container_issue |
13 |
container_start_page |
3887 |
op_container_end_page |
3900 |
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1766322750763302912 |