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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ftuniaarhuspubl:oai:pure.atira.dk:publications/baa2937f-c853-435b-9f34-a4d606956b79 2024-01-14T10:04:04+01:00 Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans Raiswell, Robert Hawkings, Jon Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon Wadham, Jemma Tranter, Martyn 2016-07-06 https://pure.au.dk/portal/en/publications/baa2937f-c853-435b-9f34-a4d606956b79 https://doi.org/10.5194/bg-13-3887-2016 eng eng https://pure.au.dk/portal/en/publications/baa2937f-c853-435b-9f34-a4d606956b79 info:eu-repo/semantics/restrictedAccess Raiswell , R , Hawkings , J , Benning , L G , Baker , A R , Death , R , Albani , S , Mahowald , N , Krom , M D , Poulton , S , Wadham , J & Tranter , M 2016 , ' Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans ' , Biogeosciences , vol. 13 , no. 13 , pp. 3887-3900 . https://doi.org/10.5194/bg-13-3887-2016 article 2016 ftuniaarhuspubl https://doi.org/10.5194/bg-13-3887-2016 2023-12-21T00:00:44Z 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 Aarhus University: Research Arctic Arctic Ocean Southern Ocean Biogeosciences 13 13 3887 3900 |
institution |
Open Polar |
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Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
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 Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon Wadham, Jemma Tranter, Martyn |
spellingShingle |
Raiswell, Robert Hawkings, Jon Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon 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 Benning, Liane G. Baker, Alex R. Death, Ros Albani, Samuel Mahowald, Natalie Krom, Michael D. Poulton, Simon 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://pure.au.dk/portal/en/publications/baa2937f-c853-435b-9f34-a4d606956b79 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_source |
Raiswell , R , Hawkings , J , Benning , L G , Baker , A R , Death , R , Albani , S , Mahowald , N , Krom , M D , Poulton , S , Wadham , J & Tranter , M 2016 , ' Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans ' , Biogeosciences , vol. 13 , no. 13 , pp. 3887-3900 . https://doi.org/10.5194/bg-13-3887-2016 |
op_relation |
https://pure.au.dk/portal/en/publications/baa2937f-c853-435b-9f34-a4d606956b79 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
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_ |
1788058680788254720 |