Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation
Dissolved iron (dFe) availability limits the uptake of atmospheric CO2 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 bio...
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2023
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ftinfoscience:oai:infoscience.epfl.ch:304687 2023-10-09T21:47:05+02:00 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 2023-08-28T00:46:36Z http://infoscience.epfl.ch/record/304687 https://doi.org/10.1126/sciadv.adf9696 unknown Washington, AMER ASSOC ADVANCEMENT SCIENCE http://infoscience.epfl.ch/record/304687 isi:001029333400017 doi:10.1126/sciadv.adf9696 http://infoscience.epfl.ch/record/304687 Text 2023 ftinfoscience https://doi.org/10.1126/sciadv.adf9696 2023-09-10T23:52:46Z Dissolved iron (dFe) availability limits the uptake of atmospheric CO2 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 similar 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. Text Antarc* Antarctica Southern Ocean EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Southern Ocean Science Advances 9 26 |
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Open Polar |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
language |
unknown |
description |
Dissolved iron (dFe) availability limits the uptake of atmospheric CO2 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 similar 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 |
Text |
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 |
Washington, AMER ASSOC ADVANCEMENT SCIENCE |
publishDate |
2023 |
url |
http://infoscience.epfl.ch/record/304687 https://doi.org/10.1126/sciadv.adf9696 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
http://infoscience.epfl.ch/record/304687 |
op_relation |
http://infoscience.epfl.ch/record/304687 isi:001029333400017 doi:10.1126/sciadv.adf9696 |
op_doi |
https://doi.org/10.1126/sciadv.adf9696 |
container_title |
Science Advances |
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9 |
container_issue |
26 |
_version_ |
1779309825433272320 |