Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2
A detailed record of benthic foraminifera carbon isotopes from the intermediate-depth South East Atlantic margin shows little glacial-interglacial variability between MIS-12 to MIS-10, suggesting that Northern Atlantic deepwaters consistently penetrated to at least 30° S. Millennial-scale increases...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00030842 2023-05-15T17:25:24+02:00 Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 Dickson, A. J. Leng, M. J. Maslin, M. A. 2008-12 electronic https://doi.org/10.5194/cp-4-333-2008 https://noa.gwlb.de/receive/cop_mods_00030842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030796/cp-4-333-2008.pdf https://cp.copernicus.org/articles/4/333/2008/cp-4-333-2008.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-4-333-2008 https://noa.gwlb.de/receive/cop_mods_00030842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030796/cp-4-333-2008.pdf https://cp.copernicus.org/articles/4/333/2008/cp-4-333-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/cp-4-333-2008 2022-02-08T22:47:01Z A detailed record of benthic foraminifera carbon isotopes from the intermediate-depth South East Atlantic margin shows little glacial-interglacial variability between MIS-12 to MIS-10, suggesting that Northern Atlantic deepwaters consistently penetrated to at least 30° S. Millennial-scale increases in either the mass or flux of northern-sourced deepwaters over the core site occurred alongside reductions in Lower North Atlantic Deep Water recorded in North Atlantic sediment cores and show that the lower and intermediate limb of the Atlantic deepwater convective cell oscillated in anti-phase during previous glacial periods. In addition, a 500 yr resolution record of the Cape Basin intermediate-deep δ13C gradient shows that a reduction in deep Southern Ocean ventilation at the end of MIS-11 was consistent with a modelled CO2 drawdown of ~21–30 ppm. Further increases in the Southern Ocean chemical divide during the transition into MIS-10 were completed before minimum CO2 levels were reached, suggesting that other mechanisms such as alkalinity changes were responsible for the remaining ~45 ppm drawdown. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean Niedersächsisches Online-Archiv NOA Southern Ocean Climate of the Past 4 4 333 344 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Dickson, A. J. Leng, M. J. Maslin, M. A. Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
topic_facet |
article Verlagsveröffentlichung |
description |
A detailed record of benthic foraminifera carbon isotopes from the intermediate-depth South East Atlantic margin shows little glacial-interglacial variability between MIS-12 to MIS-10, suggesting that Northern Atlantic deepwaters consistently penetrated to at least 30° S. Millennial-scale increases in either the mass or flux of northern-sourced deepwaters over the core site occurred alongside reductions in Lower North Atlantic Deep Water recorded in North Atlantic sediment cores and show that the lower and intermediate limb of the Atlantic deepwater convective cell oscillated in anti-phase during previous glacial periods. In addition, a 500 yr resolution record of the Cape Basin intermediate-deep δ13C gradient shows that a reduction in deep Southern Ocean ventilation at the end of MIS-11 was consistent with a modelled CO2 drawdown of ~21–30 ppm. Further increases in the Southern Ocean chemical divide during the transition into MIS-10 were completed before minimum CO2 levels were reached, suggesting that other mechanisms such as alkalinity changes were responsible for the remaining ~45 ppm drawdown. |
format |
Article in Journal/Newspaper |
author |
Dickson, A. J. Leng, M. J. Maslin, M. A. |
author_facet |
Dickson, A. J. Leng, M. J. Maslin, M. A. |
author_sort |
Dickson, A. J. |
title |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
title_short |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
title_full |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
title_fullStr |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
title_full_unstemmed |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2 |
title_sort |
mid-depth south atlantic ocean circulation and chemical stratification during mis-10 to 12: implications for atmospheric co2 |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/cp-4-333-2008 https://noa.gwlb.de/receive/cop_mods_00030842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030796/cp-4-333-2008.pdf https://cp.copernicus.org/articles/4/333/2008/cp-4-333-2008.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-4-333-2008 https://noa.gwlb.de/receive/cop_mods_00030842 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030796/cp-4-333-2008.pdf https://cp.copernicus.org/articles/4/333/2008/cp-4-333-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-4-333-2008 |
container_title |
Climate of the Past |
container_volume |
4 |
container_issue |
4 |
container_start_page |
333 |
op_container_end_page |
344 |
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1766116826336460800 |