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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ftunivcam:oai:www.repository.cam.ac.uk:1810/255146 2024-02-04T09:53:06+01:00 Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Gottschalk, Julia Skinner, Luke C Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L Waelbroeck, Claire 2016-05-17 application/pdf https://www.repository.cam.ac.uk/handle/1810/255146 English eng eng Springer Science and Business Media LLC http://dx.doi.org/10.1038/ncomms11539 Nat Commun https://www.repository.cam.ac.uk/handle/1810/255146 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ Atmosphere Carbon Carbon Dioxide Carbon Isotopes Carbon Sequestration Ice Cover Manganese Oceans and Seas Oxidation-Reduction Oxygen Uranium Water Article 2016 ftunivcam 2024-01-11T23:26:19Z 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 (14)C 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. J.G. and L.C.S. acknowledge support from the Gates Cambridge Trust, the Royal Society, the Cambridge Newton Trust and NERC grant NE/J010545/1. J.L. was supported by Marie Curie Fellowship FP7-PEOPLE-2013-IEF (Marie Curie proposal 622483). S.L.J. was funded through the Swiss National Science Foundation (grant PP00P2-144811). C.W. acknowledges support from the European Research Council grant ACCLIMATE/no 339108. This is LSCE contribution no. 4488. This is the final version of the article. It first appeared from Nature Publishing Group via https://doi.org/10.1038/ncomms11539 Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Apollo - University of Cambridge Repository Antarctic Southern Ocean |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
Atmosphere Carbon Carbon Dioxide Carbon Isotopes Carbon Sequestration Ice Cover Manganese Oceans and Seas Oxidation-Reduction Oxygen Uranium Water |
spellingShingle |
Atmosphere Carbon Carbon Dioxide Carbon Isotopes Carbon Sequestration Ice Cover Manganese Oceans and Seas Oxidation-Reduction Oxygen Uranium Water Gottschalk, Julia Skinner, Luke C Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L Waelbroeck, Claire Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. |
topic_facet |
Atmosphere Carbon Carbon Dioxide Carbon Isotopes Carbon Sequestration Ice Cover Manganese Oceans and Seas Oxidation-Reduction Oxygen Uranium Water |
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 (14)C 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. J.G. and L.C.S. acknowledge support from the Gates Cambridge Trust, the Royal Society, the Cambridge Newton Trust and NERC grant NE/J010545/1. J.L. was supported by Marie Curie Fellowship FP7-PEOPLE-2013-IEF (Marie Curie proposal 622483). S.L.J. was funded through the Swiss National Science Foundation (grant PP00P2-144811). C.W. acknowledges support from the European Research Council grant ACCLIMATE/no 339108. This is LSCE contribution no. 4488. This is the final version of the article. It first appeared from Nature Publishing Group via https://doi.org/10.1038/ncomms11539 |
format |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Skinner, Luke C Lippold, Jörg Vogel, Hendrik Frank, Norbert Jaccard, Samuel L Waelbroeck, Claire |
author_facet |
Gottschalk, Julia Skinner, Luke C Lippold, Jörg 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 |
Springer Science and Business Media LLC |
publishDate |
2016 |
url |
https://www.repository.cam.ac.uk/handle/1810/255146 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/255146 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
_version_ |
1789964180223164416 |