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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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/59780/ https://ueaeprints.uea.ac.uk/id/eprint/59780/1/bg_13_3887_2016.pdf https://doi.org/10.5194/bg-13-3887-2016 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:59780 2023-06-06T11:50:00+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 2016-07-06 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/59780/ https://ueaeprints.uea.ac.uk/id/eprint/59780/1/bg_13_3887_2016.pdf https://doi.org/10.5194/bg-13-3887-2016 en eng https://ueaeprints.uea.ac.uk/id/eprint/59780/1/bg_13_3887_2016.pdf 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 and Tranter, Martyn (2016) Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans. Biogeosciences, 13 (13). pp. 3887-3900. ISSN 1726-4170 doi:10.5194/bg-13-3887-2016 cc_by Article PeerReviewed 2016 ftuniveastangl https://doi.org/10.5194/bg-13-3887-2016 2023-04-13T22:31:53Z 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. Article in Journal/Newspaper Arctic Arctic Ocean Iceberg* Sea ice Southern Ocean University of East Anglia: UEA Digital Repository Arctic Arctic Ocean Southern Ocean Biogeosciences 13 13 3887 3900 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
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 |
Article in Journal/Newspaper |
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 |
2016 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/59780/ https://ueaeprints.uea.ac.uk/id/eprint/59780/1/bg_13_3887_2016.pdf https://doi.org/10.5194/bg-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_relation |
https://ueaeprints.uea.ac.uk/id/eprint/59780/1/bg_13_3887_2016.pdf 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 and Tranter, Martyn (2016) Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans. Biogeosciences, 13 (13). pp. 3887-3900. ISSN 1726-4170 doi:10.5194/bg-13-3887-2016 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.5194/bg-13-3887-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
13 |
container_start_page |
3887 |
op_container_end_page |
3900 |
_version_ |
1767955758744338432 |