Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods
International audience Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. Yet, there remains a paucity of proxy evidence that documents cha...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://hal.science/hal-02407224 https://hal.science/hal-02407224/document https://hal.science/hal-02407224/file/Gottschalk-QSR2020_HAL.pdf https://doi.org/10.1016/j.quascirev.2019.106067 |
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ftceafr:oai:HAL:hal-02407224v1 |
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openpolar |
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Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Southern Ocean Palaeoclimatology Carbon cycle Glacials Redox-sensitive elements Atmospheric CO2 variations Foraminifera Dansgaard-Oeschger cycles Interstadials Stadials [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Southern Ocean Palaeoclimatology Carbon cycle Glacials Redox-sensitive elements Atmospheric CO2 variations Foraminifera Dansgaard-Oeschger cycles Interstadials Stadials [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Gottschalk, Julia Skinner, Luke C. Jaccard, Samuel L. Menviel, Laurie C. Nehrbass-Ahles, Christoph Waelbroeck, Claire Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
topic_facet |
Southern Ocean Palaeoclimatology Carbon cycle Glacials Redox-sensitive elements Atmospheric CO2 variations Foraminifera Dansgaard-Oeschger cycles Interstadials Stadials [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. Yet, there remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to abrupt climate variability in the northern hemisphere associated with perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the spatial extent of the AMOC and its sensitivity to perturbations. This provides an opportunity to compare the nature of marine carbon cycle-climate feedbacks between them. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC “geometry” (via carbonate ion saturation) in the deep South Atlantic. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pattern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels. We find that net ocean carbon loss, and hence the magnitude of CO2,atm rise, is largely determined by the stadial duration. North Atlantic climate anomalies therefore affect Southern Ocean carbon cycling in a consistent manner, through oceanic (e.g., ventilation seesaw) and/or atmospheric processes (e.g., Ekman pumping). |
author2 |
Oeschger Centre for Climate Change Research (OCCR) Universität Bern = University of Bern = Université de Berne (UNIBE) Godwin Laboratory Department of Earth Sciences Cambridge, UK University of Cambridge UK (CAM)-University of Cambridge UK (CAM) Palaeontology, Geobiology and Earth Archives Research Centre (PANGEA Research Centre) School of Biological, Earth and Environmental Sciences Sydney (BEES) University of New South Wales Sydney (UNSW)-University of New South Wales Sydney (UNSW) Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern = University of Bern = Université de Berne (UNIBE)-Universität Bern = University of Bern = Université de Berne (UNIBE) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) European Project: 339108,EC:FP7:ERC,ERC-2013-ADG,ACCLIMATE(2014) |
format |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Skinner, Luke C. Jaccard, Samuel L. Menviel, Laurie C. Nehrbass-Ahles, Christoph Waelbroeck, Claire |
author_facet |
Gottschalk, Julia Skinner, Luke C. Jaccard, Samuel L. Menviel, Laurie C. Nehrbass-Ahles, Christoph Waelbroeck, Claire |
author_sort |
Gottschalk, Julia |
title |
Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
title_short |
Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
title_full |
Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
title_fullStr |
Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
title_full_unstemmed |
Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
title_sort |
southern ocean link between changes in atmospheric co 2 levels and northern-hemisphere climate anomalies during the last two glacial periods |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02407224 https://hal.science/hal-02407224/document https://hal.science/hal-02407224/file/Gottschalk-QSR2020_HAL.pdf https://doi.org/10.1016/j.quascirev.2019.106067 |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-02407224 Quaternary Science Reviews, 2020, 230, pp.106067. ⟨10.1016/j.quascirev.2019.106067⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2019.106067 info:eu-repo/grantAgreement/EC/FP7/339108/EU/Elucidating the Causes and Effects of Atlantic Circulation Changes through Model-Data Integration/ACCLIMATE hal-02407224 https://hal.science/hal-02407224 https://hal.science/hal-02407224/document https://hal.science/hal-02407224/file/Gottschalk-QSR2020_HAL.pdf doi:10.1016/j.quascirev.2019.106067 WOS: 000514754000002 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.106067 |
container_title |
Quaternary Science Reviews |
container_volume |
230 |
container_start_page |
106067 |
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1810464292301963264 |
spelling |
ftceafr:oai:HAL:hal-02407224v1 2024-09-15T18:24:00+00:00 Southern Ocean link between changes in atmospheric CO 2 levels and northern-hemisphere climate anomalies during the last two glacial periods Gottschalk, Julia Skinner, Luke C. Jaccard, Samuel L. Menviel, Laurie C. Nehrbass-Ahles, Christoph Waelbroeck, Claire Oeschger Centre for Climate Change Research (OCCR) Universität Bern = University of Bern = Université de Berne (UNIBE) Godwin Laboratory Department of Earth Sciences Cambridge, UK University of Cambridge UK (CAM)-University of Cambridge UK (CAM) Palaeontology, Geobiology and Earth Archives Research Centre (PANGEA Research Centre) School of Biological, Earth and Environmental Sciences Sydney (BEES) University of New South Wales Sydney (UNSW)-University of New South Wales Sydney (UNSW) Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern = University of Bern = Université de Berne (UNIBE)-Universität Bern = University of Bern = Université de Berne (UNIBE) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) European Project: 339108,EC:FP7:ERC,ERC-2013-ADG,ACCLIMATE(2014) 2020 https://hal.science/hal-02407224 https://hal.science/hal-02407224/document https://hal.science/hal-02407224/file/Gottschalk-QSR2020_HAL.pdf https://doi.org/10.1016/j.quascirev.2019.106067 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2019.106067 info:eu-repo/grantAgreement/EC/FP7/339108/EU/Elucidating the Causes and Effects of Atlantic Circulation Changes through Model-Data Integration/ACCLIMATE hal-02407224 https://hal.science/hal-02407224 https://hal.science/hal-02407224/document https://hal.science/hal-02407224/file/Gottschalk-QSR2020_HAL.pdf doi:10.1016/j.quascirev.2019.106067 WOS: 000514754000002 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-02407224 Quaternary Science Reviews, 2020, 230, pp.106067. ⟨10.1016/j.quascirev.2019.106067⟩ Southern Ocean Palaeoclimatology Carbon cycle Glacials Redox-sensitive elements Atmospheric CO2 variations Foraminifera Dansgaard-Oeschger cycles Interstadials Stadials [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2020 ftceafr https://doi.org/10.1016/j.quascirev.2019.106067 2024-07-29T23:36:00Z International audience Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. Yet, there remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to abrupt climate variability in the northern hemisphere associated with perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the spatial extent of the AMOC and its sensitivity to perturbations. This provides an opportunity to compare the nature of marine carbon cycle-climate feedbacks between them. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC “geometry” (via carbonate ion saturation) in the deep South Atlantic. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pattern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels. We find that net ocean carbon loss, and hence the magnitude of CO2,atm rise, is largely determined by the stadial duration. North Atlantic climate anomalies therefore affect Southern Ocean carbon cycling in a consistent manner, through oceanic (e.g., ventilation seesaw) and/or atmospheric processes (e.g., Ekman pumping). Article in Journal/Newspaper North Atlantic Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Quaternary Science Reviews 230 106067 |