Oxygen depletion recorded in upper waters of the glacial Southern Ocean
Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 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 O2-d...
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ftnerc:oai:nora.nerc.ac.uk:510746 2023-05-15T13:49:32+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. 2016-03 text http://nora.nerc.ac.uk/id/eprint/510746/ https://nora.nerc.ac.uk/id/eprint/510746/1/Lu.pdf http://www.nature.com/ncomms/2016/160331/ncomms11146/full/ncomms11146.html#affil-auth en eng Nature Publishing Group https://nora.nerc.ac.uk/id/eprint/510746/1/Lu.pdf Lu, Zunli; Hoogakker, Babette A.A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Zhou, Xiaoli; Thomas, Ellen; Gutchess, Kristina M.; Lu, Wanyi; Jones, Luke; Rickaby, Rosalind E.M. 2016 Oxygen depletion recorded in upper waters of the glacial Southern Ocean. Nature Communications, 7, 11146. 8, pp. https://doi.org/10.1038/ncomms11146 <https://doi.org/10.1038/ncomms11146> cc_by_4 CC-BY Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.1038/ncomms11146 2023-02-04T19:41:34Z Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 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 O2-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 O2 concentrations in the upper ocean fell below 70 μmol kg−1 during the last two glacial periods, indicating persistent glacial O2 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 CO2 decline. Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Nature Communications 7 1 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 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 O2-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 O2 concentrations in the upper ocean fell below 70 μmol kg−1 during the last two glacial periods, indicating persistent glacial O2 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 CO2 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. |
spellingShingle |
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 |
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 |
Nature Publishing Group |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/510746/ https://nora.nerc.ac.uk/id/eprint/510746/1/Lu.pdf http://www.nature.com/ncomms/2016/160331/ncomms11146/full/ncomms11146.html#affil-auth |
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_relation |
https://nora.nerc.ac.uk/id/eprint/510746/1/Lu.pdf Lu, Zunli; Hoogakker, Babette A.A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Zhou, Xiaoli; Thomas, Ellen; Gutchess, Kristina M.; Lu, Wanyi; Jones, Luke; Rickaby, Rosalind E.M. 2016 Oxygen depletion recorded in upper waters of the glacial Southern Ocean. Nature Communications, 7, 11146. 8, pp. https://doi.org/10.1038/ncomms11146 <https://doi.org/10.1038/ncomms11146> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/ncomms11146 |
container_title |
Nature Communications |
container_volume |
7 |
container_issue |
1 |
_version_ |
1766251489757495296 |