Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation
Dissolved iron (dFe) availability limits the uptake of atmospheric CO 2 by the Southern Ocean (SO) biological pump. Hence, any change in bioavailable dFe in this region can directly influence climate. On the basis of Fe uptake experiments with Phaeocystis antarctica , we show that the range of dFe b...
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Online Access: | http://dx.doi.org/10.1126/sciadv.adf9696 https://www.science.org/doi/pdf/10.1126/sciadv.adf9696 |
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craaas:10.1126/sciadv.adf9696 2024-09-30T14:24:59+00:00 Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation Fourquez, Marion Janssen, David J. Conway, Tim M. Cabanes, Damien Ellwood, Michael J. Sieber, Matthias Trimborn, Scarlett Hassler, Christel 2023 http://dx.doi.org/10.1126/sciadv.adf9696 https://www.science.org/doi/pdf/10.1126/sciadv.adf9696 en eng American Association for the Advancement of Science (AAAS) Science Advances volume 9, issue 26 ISSN 2375-2548 journal-article 2023 craaas https://doi.org/10.1126/sciadv.adf9696 2024-09-05T04:01:24Z Dissolved iron (dFe) availability limits the uptake of atmospheric CO 2 by the Southern Ocean (SO) biological pump. Hence, any change in bioavailable dFe in this region can directly influence climate. On the basis of Fe uptake experiments with Phaeocystis antarctica , we show that the range of dFe bioavailability in natural samples is wider (<1 to ~200% compared to free inorganic Fe′) than previously thought, with higher bioavailability found near glacial sources. The degree of bioavailability varied regardless of in situ dFe concentration and depth, challenging the consensus that sole dFe concentrations can be used to predict Fe uptake in modeling studies. Further, our data suggest a disproportionately major role of biologically mediated ligands and encourage revisiting the role of humic substances in influencing marine Fe biogeochemical cycling in the SO. Last, we describe a linkage between in situ dFe bioavailability and isotopic signatures that, we anticipate, will stimulate future research. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean AAAS Resource Center (American Association for the Advancement of Science) Southern Ocean Science Advances 9 26 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Dissolved iron (dFe) availability limits the uptake of atmospheric CO 2 by the Southern Ocean (SO) biological pump. Hence, any change in bioavailable dFe in this region can directly influence climate. On the basis of Fe uptake experiments with Phaeocystis antarctica , we show that the range of dFe bioavailability in natural samples is wider (<1 to ~200% compared to free inorganic Fe′) than previously thought, with higher bioavailability found near glacial sources. The degree of bioavailability varied regardless of in situ dFe concentration and depth, challenging the consensus that sole dFe concentrations can be used to predict Fe uptake in modeling studies. Further, our data suggest a disproportionately major role of biologically mediated ligands and encourage revisiting the role of humic substances in influencing marine Fe biogeochemical cycling in the SO. Last, we describe a linkage between in situ dFe bioavailability and isotopic signatures that, we anticipate, will stimulate future research. |
format |
Article in Journal/Newspaper |
author |
Fourquez, Marion Janssen, David J. Conway, Tim M. Cabanes, Damien Ellwood, Michael J. Sieber, Matthias Trimborn, Scarlett Hassler, Christel |
spellingShingle |
Fourquez, Marion Janssen, David J. Conway, Tim M. Cabanes, Damien Ellwood, Michael J. Sieber, Matthias Trimborn, Scarlett Hassler, Christel Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
author_facet |
Fourquez, Marion Janssen, David J. Conway, Tim M. Cabanes, Damien Ellwood, Michael J. Sieber, Matthias Trimborn, Scarlett Hassler, Christel |
author_sort |
Fourquez, Marion |
title |
Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
title_short |
Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
title_full |
Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
title_fullStr |
Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
title_full_unstemmed |
Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation |
title_sort |
chasing iron bioavailability in the southern ocean: insights from phaeocystis antarctica and iron speciation |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1126/sciadv.adf9696 https://www.science.org/doi/pdf/10.1126/sciadv.adf9696 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
Science Advances volume 9, issue 26 ISSN 2375-2548 |
op_doi |
https://doi.org/10.1126/sciadv.adf9696 |
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Science Advances |
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9 |
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26 |
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1811642979620749312 |