Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age
No single mechanism can account for the full amplitude of past atmospheric carbon dioxide (CO 2 ) concentration variability over glacial-interglacial cycles(1). A build-up of carbon in the deep ocean has been shown to have occurred during the Last Glacial Maximum(2,3). However, the mechanisms respon...
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ftpubman:oai:pure.mpg.de:item_2260675 2023-08-20T04:02:25+02:00 Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age Jaccard, S. Galbraith, E. Martinez-Garcia, A. Anderson, R. 2016-02-11 http://hdl.handle.net/11858/00-001M-0000-002A-2194-B unknown info:eu-repo/semantics/altIdentifier/doi/10.1038/nature16514 http://hdl.handle.net/11858/00-001M-0000-002A-2194-B Nature info:eu-repo/semantics/article 2016 ftpubman https://doi.org/10.1038/nature16514 2023-08-01T20:36:18Z No single mechanism can account for the full amplitude of past atmospheric carbon dioxide (CO 2 ) concentration variability over glacial-interglacial cycles(1). A build-up of carbon in the deep ocean has been shown to have occurred during the Last Glacial Maximum(2,3). However, the mechanisms responsible for the release of the deeply sequestered carbon to the atmosphere at deglaciation, and the relative importance of deep ocean sequestration in regulating millennial-timescale variations in atmospheric CO 2 concentration before the Last Glacial Maximum, have remained unclear. Here we present sedimentary redox-sensitive trace-metal records from the Antarctic Zone of the Southern Ocean that provide a reconstruction of transient changes in deep ocean oxygenation and, by inference, respired carbon storage throughout the last glacial cycle. Our data suggest that respired carbon was removed from the abyssal Southern Ocean during the Northern Hemisphere cold phases of the deglaciation, when atmospheric CO 2 concentration increased rapidly, reflecting-at least in part-a combination of dwindling iron fertilization by dust and enhanced deep ocean ventilation. Furthermore, our records show that the observed covariation between atmospheric CO 2 concentration and abyssal Southern Ocean oxygenation was maintained throughout most of the past 80,000 years. This suggests that on millennial timescales deep ocean circulation and iron fertilization in the Southern Ocean played a consistent role in modifying atmospheric CO 2 concentration. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Max Planck Society: MPG.PuRe Antarctic Southern Ocean The Antarctic Nature 530 7589 207 210 |
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Max Planck Society: MPG.PuRe |
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No single mechanism can account for the full amplitude of past atmospheric carbon dioxide (CO 2 ) concentration variability over glacial-interglacial cycles(1). A build-up of carbon in the deep ocean has been shown to have occurred during the Last Glacial Maximum(2,3). However, the mechanisms responsible for the release of the deeply sequestered carbon to the atmosphere at deglaciation, and the relative importance of deep ocean sequestration in regulating millennial-timescale variations in atmospheric CO 2 concentration before the Last Glacial Maximum, have remained unclear. Here we present sedimentary redox-sensitive trace-metal records from the Antarctic Zone of the Southern Ocean that provide a reconstruction of transient changes in deep ocean oxygenation and, by inference, respired carbon storage throughout the last glacial cycle. Our data suggest that respired carbon was removed from the abyssal Southern Ocean during the Northern Hemisphere cold phases of the deglaciation, when atmospheric CO 2 concentration increased rapidly, reflecting-at least in part-a combination of dwindling iron fertilization by dust and enhanced deep ocean ventilation. Furthermore, our records show that the observed covariation between atmospheric CO 2 concentration and abyssal Southern Ocean oxygenation was maintained throughout most of the past 80,000 years. This suggests that on millennial timescales deep ocean circulation and iron fertilization in the Southern Ocean played a consistent role in modifying atmospheric CO 2 concentration. |
format |
Article in Journal/Newspaper |
author |
Jaccard, S. Galbraith, E. Martinez-Garcia, A. Anderson, R. |
spellingShingle |
Jaccard, S. Galbraith, E. Martinez-Garcia, A. Anderson, R. Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
author_facet |
Jaccard, S. Galbraith, E. Martinez-Garcia, A. Anderson, R. |
author_sort |
Jaccard, S. |
title |
Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
title_short |
Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
title_full |
Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
title_fullStr |
Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
title_full_unstemmed |
Covariation of deep Southern Ocean oxygenation and atmospheric CO 2 through the last ice age |
title_sort |
covariation of deep southern ocean oxygenation and atmospheric co 2 through the last ice age |
publishDate |
2016 |
url |
http://hdl.handle.net/11858/00-001M-0000-002A-2194-B |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Nature |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/nature16514 http://hdl.handle.net/11858/00-001M-0000-002A-2194-B |
op_doi |
https://doi.org/10.1038/nature16514 |
container_title |
Nature |
container_volume |
530 |
container_issue |
7589 |
container_start_page |
207 |
op_container_end_page |
210 |
_version_ |
1774712851957547008 |