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 this role...
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ftunivbern:oai:boris.unibe.ch:82543 2023-08-20T04:02:02+02:00 Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes Gottschalk, Julia Skinner, Luke Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel Waelbroeck, Claire 2016-05-17 application/pdf https://boris.unibe.ch/82543/1/Gottschalk%20et%20al.,%2016.pdf https://boris.unibe.ch/82543/ eng eng Nature Publishing Group https://boris.unibe.ch/82543/ info:eu-repo/semantics/openAccess Gottschalk, Julia; Skinner, Luke; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel; Waelbroeck, Claire (2016). Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature communications, 7(11539), p. 11539. Nature Publishing Group 10.1038/ncomms11539 <http://dx.doi.org/10.1038/ncomms11539> 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2016 ftunivbern https://doi.org/10.1038/ncomms11539 2023-07-31T21:26:24Z 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. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Southern Ocean Nature Communications 7 1 |
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Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
550 Earth sciences & geology |
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550 Earth sciences & geology Gottschalk, Julia Skinner, Luke Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel Waelbroeck, Claire Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes |
topic_facet |
550 Earth sciences & geology |
description |
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 |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Skinner, Luke Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel Waelbroeck, Claire |
author_facet |
Gottschalk, Julia Skinner, Luke Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel 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 |
publishDate |
2016 |
url |
https://boris.unibe.ch/82543/1/Gottschalk%20et%20al.,%2016.pdf https://boris.unibe.ch/82543/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Gottschalk, Julia; Skinner, Luke; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel; Waelbroeck, Claire (2016). Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature communications, 7(11539), p. 11539. Nature Publishing Group 10.1038/ncomms11539 <http://dx.doi.org/10.1038/ncomms11539> |
op_relation |
https://boris.unibe.ch/82543/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/ncomms11539 |
container_title |
Nature Communications |
container_volume |
7 |
container_issue |
1 |
_version_ |
1774712410760806400 |