Oxygen depletion recorded in upper waters of the glacial Southern Ocean
Abstract Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO 2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ∼2.5 μmol mol −1 indicate the prese...
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Online Access: | http://dx.doi.org/10.1038/ncomms11146 http://www.nature.com/articles/ncomms11146.pdf http://www.nature.com/articles/ncomms11146 |
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crspringernat:10.1038/ncomms11146 2023-05-15T14:09:54+02:00 Oxygen depletion recorded in upper waters of the glacial Southern Ocean Lu, Zunli Hoogakker, Babette A. A. Hillenbrand, Claus-Dieter Zhou, Xiaoli Thomas, Ellen Gutchess, Kristina M. Lu, Wanyi Jones, Luke Rickaby, Rosalind E. M. 2016 http://dx.doi.org/10.1038/ncomms11146 http://www.nature.com/articles/ncomms11146.pdf http://www.nature.com/articles/ncomms11146 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Nature Communications volume 7, issue 1 ISSN 2041-1723 General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry journal-article 2016 crspringernat https://doi.org/10.1038/ncomms11146 2022-01-14T15:38:12Z Abstract Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO 2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ∼2.5 μmol mol −1 indicate the presence of O 2 -depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration during glacial times. A down-core planktonic I/Ca record from south of the Antarctic Polar Front (APF) suggests that minimum O 2 concentrations in the upper ocean fell below 70 μmol kg −1 during the last two glacial periods, indicating persistent glacial O 2 depletion at the heart of the carbon engine of the Earth’s climate system. These new estimates of past ocean oxygenation variability may assist in resolving mechanisms responsible for the much-debated ice-age atmospheric CO 2 decline. Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Southern Ocean Springer Nature (via Crossref) Antarctic Southern Ocean The Antarctic Nature Communications 7 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
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General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry Lu, Zunli Hoogakker, Babette A. A. Hillenbrand, Claus-Dieter Zhou, Xiaoli Thomas, Ellen Gutchess, Kristina M. Lu, Wanyi Jones, Luke Rickaby, Rosalind E. M. Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
topic_facet |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
description |
Abstract Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO 2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ∼2.5 μmol mol −1 indicate the presence of O 2 -depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration during glacial times. A down-core planktonic I/Ca record from south of the Antarctic Polar Front (APF) suggests that minimum O 2 concentrations in the upper ocean fell below 70 μmol kg −1 during the last two glacial periods, indicating persistent glacial O 2 depletion at the heart of the carbon engine of the Earth’s climate system. These new estimates of past ocean oxygenation variability may assist in resolving mechanisms responsible for the much-debated ice-age atmospheric CO 2 decline. |
format |
Article in Journal/Newspaper |
author |
Lu, Zunli Hoogakker, Babette A. A. Hillenbrand, Claus-Dieter Zhou, Xiaoli Thomas, Ellen Gutchess, Kristina M. Lu, Wanyi Jones, Luke Rickaby, Rosalind E. M. |
author_facet |
Lu, Zunli Hoogakker, Babette A. A. Hillenbrand, Claus-Dieter Zhou, Xiaoli Thomas, Ellen Gutchess, Kristina M. Lu, Wanyi Jones, Luke Rickaby, Rosalind E. M. |
author_sort |
Lu, Zunli |
title |
Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
title_short |
Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
title_full |
Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
title_fullStr |
Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
title_full_unstemmed |
Oxygen depletion recorded in upper waters of the glacial Southern Ocean |
title_sort |
oxygen depletion recorded in upper waters of the glacial southern ocean |
publisher |
Springer Science and Business Media LLC |
publishDate |
2016 |
url |
http://dx.doi.org/10.1038/ncomms11146 http://www.nature.com/articles/ncomms11146.pdf http://www.nature.com/articles/ncomms11146 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
op_source |
Nature Communications volume 7, issue 1 ISSN 2041-1723 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/ncomms11146 |
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Nature Communications |
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7 |
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1 |
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1766281914213203968 |