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| Auteurs principaux: | , , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2015
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| Sujets: | |
| Accès en ligne: | https://doi.org/10.1594/PANGAEA.845078 |
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| _version_ | 1867169511975682048 |
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| author | Gottschalk, Julia Skinner, Luke C Lippold, Jörg Jaccard, Samuel L Vogel, Hendrik Frank, Norbert Waelbroeck, Claire |
| author_facet | Gottschalk, Julia Skinner, Luke C Lippold, Jörg Jaccard, Samuel L Vogel, Hendrik Frank, Norbert Waelbroeck, Claire |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_845078 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Productivity- and ocean circulation changes in the sub-Antarctic Atlantic during the last deglaciation and Marine Isotope Stage 3 Gottschalk, Julia Skinner, Luke C Lippold, Jörg Jaccard, Samuel L Vogel, Hendrik Frank, Norbert Waelbroeck, Claire 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. |
| title | Productivity- and ocean circulation changes in the sub-Antarctic Atlantic during the last deglaciation and Marine Isotope Stage 3 |
| topic | |
| url | https://doi.org/10.1594/PANGAEA.845078 |