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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ftunivbern:oai:boris.unibe.ch:10150 2023-08-20T04:09:56+02:00 Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise Tschumi, Tobias Joos, Fortunat Gehlen, M. Heinze, C. 2011 application/pdf https://boris.unibe.ch/10150/1/cp-7-771-2011.pdf https://boris.unibe.ch/10150/ eng eng Copernicus Publications https://boris.unibe.ch/10150/ info:eu-repo/semantics/openAccess Tschumi, Tobias; Joos, Fortunat; Gehlen, M.; Heinze, C. (2011). Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise. Climate of the past, 7(3), pp. 771-800. Göttingen: Copernicus Publications 10.5194/cp-7-771-2011 <http://dx.doi.org/10.5194/cp-7-771-2011> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2011 ftunivbern https://doi.org/10.5194/cp-7-771-2011 2023-07-31T20:33:35Z 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 BORIS (Bern Open Repository and Information System, University of Bern) Pacific Southern Ocean Climate of the Past 7 3 771 800 |
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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 |
description |
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, Tobias Joos, Fortunat Gehlen, M. Heinze, C. |
spellingShingle |
Tschumi, Tobias Joos, Fortunat Gehlen, M. Heinze, C. Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise |
author_facet |
Tschumi, Tobias Joos, Fortunat Gehlen, M. Heinze, C. |
author_sort |
Tschumi, Tobias |
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 |
2011 |
url |
https://boris.unibe.ch/10150/1/cp-7-771-2011.pdf https://boris.unibe.ch/10150/ |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Tschumi, Tobias; Joos, Fortunat; Gehlen, M.; Heinze, C. (2011). Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise. Climate of the past, 7(3), pp. 771-800. Göttingen: Copernicus Publications 10.5194/cp-7-771-2011 <http://dx.doi.org/10.5194/cp-7-771-2011> |
op_relation |
https://boris.unibe.ch/10150/ |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
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1774723696098803712 |