Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise
The link between the atmospheric CO2 level and the ventilation state of the deep ocean is an important building block of the key hypotheses put forth to explain glacial-interglacial CO2 fluctuations. In this study, we systematically examine the sensitivity of atmospheric CO2 and its carbon isotope c...
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Online Access: | https://doi.org/10.5194/cp-7-771-2011 https://cp.copernicus.org/articles/7/771/2011/ |
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fttriple:oai:gotriple.eu:6667IpMV1gw5cxCjiwzMW 2023-05-15T18:25:00+02:00 Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise Tschumi, T. Joos, F. Gehlen, M. Heinze, C. 2018-09-27 https://doi.org/10.5194/cp-7-771-2011 https://cp.copernicus.org/articles/7/771/2011/ en eng Copernicus Publications doi:10.5194/cp-7-771-2011 10670/1.q5h4no 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/771/2011/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-7-771-2011 2023-01-22T17:54:43Z The link between the atmospheric CO2 level and the ventilation state of the deep ocean is an important building block of the key hypotheses put forth to explain glacial-interglacial CO2 fluctuations. In this study, we systematically examine the sensitivity of atmospheric CO2 and its carbon isotope composition to changes in deep ocean ventilation, the ocean carbon pumps, and sediment formation in a global 3-D ocean-sediment carbon cycle model. Our results provide support for the hypothesis that a break up of Southern Ocean stratification and invigorated deep ocean ventilation were the dominant drivers for the early deglacial CO2 rise of ~35 ppm between the Last Glacial Maximum and 14.6 ka BP. Another rise of 10 ppm until the end of the Holocene is attributed to carbonate compensation responding to the early deglacial change in ocean circulation. Our reasoning is based on a multi-proxy analysis which indicates that an acceleration of deep ocean ventilation during early deglaciation is not only consistent with recorded atmospheric CO2 but also with the reconstructed opal sedimentation peak in the Southern Ocean at around 16 ka BP, the record of atmospheric δ13CCO2, and the reconstructed changes in the Pacific CaCO3 saturation horizon. Article in Journal/Newspaper Southern Ocean Unknown Southern Ocean Pacific Climate of the Past 7 3 771 800 |
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geo envir Tschumi, T. Joos, F. Gehlen, M. Heinze, C. Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
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The link between the atmospheric CO2 level and the ventilation state of the deep ocean is an important building block of the key hypotheses put forth to explain glacial-interglacial CO2 fluctuations. In this study, we systematically examine the sensitivity of atmospheric CO2 and its carbon isotope composition to changes in deep ocean ventilation, the ocean carbon pumps, and sediment formation in a global 3-D ocean-sediment carbon cycle model. Our results provide support for the hypothesis that a break up of Southern Ocean stratification and invigorated deep ocean ventilation were the dominant drivers for the early deglacial CO2 rise of ~35 ppm between the Last Glacial Maximum and 14.6 ka BP. Another rise of 10 ppm until the end of the Holocene is attributed to carbonate compensation responding to the early deglacial change in ocean circulation. Our reasoning is based on a multi-proxy analysis which indicates that an acceleration of deep ocean ventilation during early deglaciation is not only consistent with recorded atmospheric CO2 but also with the reconstructed opal sedimentation peak in the Southern Ocean at around 16 ka BP, the record of atmospheric δ13CCO2, and the reconstructed changes in the Pacific CaCO3 saturation horizon. |
format |
Article in Journal/Newspaper |
author |
Tschumi, T. Joos, F. Gehlen, M. Heinze, C. |
author_facet |
Tschumi, T. Joos, F. Gehlen, M. Heinze, C. |
author_sort |
Tschumi, T. |
title |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
title_short |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
title_full |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
title_fullStr |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
title_full_unstemmed |
Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
title_sort |
deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial co2 rise |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-7-771-2011 https://cp.copernicus.org/articles/7/771/2011/ |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-7-771-2011 10670/1.q5h4no 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/771/2011/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-7-771-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
3 |
container_start_page |
771 |
op_container_end_page |
800 |
_version_ |
1766206101255094272 |