Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes
Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a 'control valve' on ocean–atmosphere CO2 exchange has been emphasized, the exact nature of...
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fttriple:oai:gotriple.eu:10670/1.9nu98v 2023-05-15T13:58:38+02:00 Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes Gottschalk, Julia Skinner, Luke C. Lippold, Joerg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L. Waelbroeck, Claire https://doi.org/10.1038/ncomms11539 https://archimer.ifremer.fr/doc/00334/44544/44256.pdf https://archimer.ifremer.fr/doc/00334/44544/44257.pdf https://archimer.ifremer.fr/doc/00334/44544/ en eng Nature Publishing Group doi:10.1038/ncomms11539 10670/1.9nu98v https://archimer.ifremer.fr/doc/00334/44544/44256.pdf https://archimer.ifremer.fr/doc/00334/44544/44257.pdf https://archimer.ifremer.fr/doc/00334/44544/ lic_creative-commons other Archimer, archive institutionnelle de l'Ifremer Nature Communications (2041-1723) (Nature Publishing Group), 2016-05 , Vol. 7 , P. - geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1038/ncomms11539 2023-01-22T17:38:34Z Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a 'control valve' on ocean–atmosphere CO2 exchange has been emphasized, the exact nature of this role, in particular the relative contributions of physical (for example, ocean dynamics and air–sea gas exchange) versus biological processes (for example, export productivity), remains poorly constrained. Here we combine reconstructions of bottom-water [O2], export production and 14C ventilation ages in the sub-Antarctic Atlantic, and show that atmospheric CO2 pulses during the last glacial- and deglacial periods were consistently accompanied by decreases in the biological export of carbon and increases in deep-ocean ventilation via southern-sourced water masses. These findings demonstrate how the Southern Ocean's 'organic carbon pump' has exerted a tight control on atmospheric CO2, and thus global climate, specifically via a synergy of both physical and biological processes. Text Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean Nature Communications 7 1 |
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geo envir Gottschalk, Julia Skinner, Luke C. Lippold, Joerg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L. Waelbroeck, Claire Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
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geo envir |
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Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a 'control valve' on ocean–atmosphere CO2 exchange has been emphasized, the exact nature of this role, in particular the relative contributions of physical (for example, ocean dynamics and air–sea gas exchange) versus biological processes (for example, export productivity), remains poorly constrained. Here we combine reconstructions of bottom-water [O2], export production and 14C ventilation ages in the sub-Antarctic Atlantic, and show that atmospheric CO2 pulses during the last glacial- and deglacial periods were consistently accompanied by decreases in the biological export of carbon and increases in deep-ocean ventilation via southern-sourced water masses. These findings demonstrate how the Southern Ocean's 'organic carbon pump' has exerted a tight control on atmospheric CO2, and thus global climate, specifically via a synergy of both physical and biological processes. |
format |
Text |
author |
Gottschalk, Julia Skinner, Luke C. Lippold, Joerg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L. Waelbroeck, Claire |
author_facet |
Gottschalk, Julia Skinner, Luke C. Lippold, Joerg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L. Waelbroeck, Claire |
author_sort |
Gottschalk, Julia |
title |
Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
title_short |
Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
title_full |
Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
title_fullStr |
Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
title_full_unstemmed |
Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
title_sort |
biological and physical controls in the southern ocean on past millennial-scale atmospheric co2 changes |
publisher |
Nature Publishing Group |
url |
https://doi.org/10.1038/ncomms11539 https://archimer.ifremer.fr/doc/00334/44544/44256.pdf https://archimer.ifremer.fr/doc/00334/44544/44257.pdf https://archimer.ifremer.fr/doc/00334/44544/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Nature Communications (2041-1723) (Nature Publishing Group), 2016-05 , Vol. 7 , P. - |
op_relation |
doi:10.1038/ncomms11539 10670/1.9nu98v https://archimer.ifremer.fr/doc/00334/44544/44256.pdf https://archimer.ifremer.fr/doc/00334/44544/44257.pdf https://archimer.ifremer.fr/doc/00334/44544/ |
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lic_creative-commons other |
op_doi |
https://doi.org/10.1038/ncomms11539 |
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Nature Communications |
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7 |
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1 |
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1766266991416442880 |