Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources
The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weath...
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Online Access: | https://hdl.handle.net/1983/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://research-information.bris.ac.uk/en/publications/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://doi.org/10.1029/2019GL084180 https://research-information.bris.ac.uk/ws/files/215121577/Shoenfelt_et_al_2019_Geophysical_Research_Letters.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/57ae6b56-3d44-4ade-b9a8-dc1360234098 2024-02-11T10:08:51+01:00 Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources Shoenfelt, Elizabeth Winkler, Gisela Annett, Amber L Hendry, Katharine R Bostick, Benjamin C 2019-10-16 application/pdf https://hdl.handle.net/1983/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://research-information.bris.ac.uk/en/publications/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://doi.org/10.1029/2019GL084180 https://research-information.bris.ac.uk/ws/files/215121577/Shoenfelt_et_al_2019_Geophysical_Research_Letters.pdf eng eng info:eu-repo/grantAgreement/EC/H2020/678371 info:eu-repo/semantics/openAccess Shoenfelt , E , Winkler , G , Annett , A L , Hendry , K R & Bostick , B C 2019 , ' Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources ' , Geophysical Research Letters , vol. 46 , no. 19 , pp. 10854-10864 . https://doi.org/10.1029/2019GL084180 dust iron physical weathering bioavailability mineralogy carbon cycle article 2019 ftubristolcris https://doi.org/10.1029/2019GL084180 2024-01-18T23:31:30Z The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals, and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling. Article in Journal/Newspaper Southern Ocean University of Bristol: Bristol Research Southern Ocean Geophysical Research Letters 46 19 10854 10864 |
institution |
Open Polar |
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University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
dust iron physical weathering bioavailability mineralogy carbon cycle |
spellingShingle |
dust iron physical weathering bioavailability mineralogy carbon cycle Shoenfelt, Elizabeth Winkler, Gisela Annett, Amber L Hendry, Katharine R Bostick, Benjamin C Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
topic_facet |
dust iron physical weathering bioavailability mineralogy carbon cycle |
description |
The speciation of iron (Fe) reaching the ocean, for instance in wind-blown dust and coastal sediments, impacts its bioavailability to phytoplankton and its impact on atmospheric carbon dioxide (CO2) and climate. For dust reaching the Southern Ocean, primary Fe(II) silicates that are physically weathered from bedrock are highly bioavailable compared to more chemically weathered, Fe(III)-rich species, suggesting that weathering in dust source regions impacts the bioavailable Fe supply. However, this phenomenon has not been studied in other important terrestrial Fe sources, where weathering regimes and source geology vary. Here, we use Fe X-ray absorption spectroscopy on marine sediment cores to show that major global dust and sediment sources impacted by high physical weathering contain abundant primary minerals, and thus are overlooked as a source of highly bioavailable Fe globally. Thus, it is important to consider the role of physical versus chemical weathering in Fe fertilization and biotic CO2 cycling. |
format |
Article in Journal/Newspaper |
author |
Shoenfelt, Elizabeth Winkler, Gisela Annett, Amber L Hendry, Katharine R Bostick, Benjamin C |
author_facet |
Shoenfelt, Elizabeth Winkler, Gisela Annett, Amber L Hendry, Katharine R Bostick, Benjamin C |
author_sort |
Shoenfelt, Elizabeth |
title |
Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
title_short |
Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
title_full |
Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
title_fullStr |
Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
title_full_unstemmed |
Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources |
title_sort |
physical weathering intensity controls bioavailable primary iron(ii) silicate content in major global dust sources |
publishDate |
2019 |
url |
https://hdl.handle.net/1983/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://research-information.bris.ac.uk/en/publications/57ae6b56-3d44-4ade-b9a8-dc1360234098 https://doi.org/10.1029/2019GL084180 https://research-information.bris.ac.uk/ws/files/215121577/Shoenfelt_et_al_2019_Geophysical_Research_Letters.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Shoenfelt , E , Winkler , G , Annett , A L , Hendry , K R & Bostick , B C 2019 , ' Physical weathering intensity controls bioavailable primary iron(II) silicate content in major global dust sources ' , Geophysical Research Letters , vol. 46 , no. 19 , pp. 10854-10864 . https://doi.org/10.1029/2019GL084180 |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/678371 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019GL084180 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
19 |
container_start_page |
10854 |
op_container_end_page |
10864 |
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1790608467666403328 |