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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ftnerc:oai:nora.nerc.ac.uk:6048 2024-06-09T07:47:56+00:00 Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12 : implications for atmospheric CO2 Dickson, A.J. Leng, Melanie Maslin, M.A. 2008 text http://nora.nerc.ac.uk/id/eprint/6048/ https://nora.nerc.ac.uk/id/eprint/6048/1/cp-4-333-2008.pdf http://www.climate-of-the-past.net/index.html en eng European Geosciences Union https://nora.nerc.ac.uk/id/eprint/6048/1/cp-4-333-2008.pdf Dickson, A.J.; Leng, Melanie orcid:0000-0003-1115-5166 Maslin, M.A. 2008 Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12 : implications for atmospheric CO2. Climate of the Past, 4. 333-344. Earth Sciences Publication - Article PeerReviewed 2008 ftnerc 2024-05-15T08:52:26Z 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 Natural Environment Research Council: NERC Open Research Archive Southern Ocean |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Dickson, A.J. Leng, Melanie Maslin, M.A. Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12 : implications for atmospheric CO2 |
topic_facet |
Earth Sciences |
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, Melanie Maslin, M.A. |
author_facet |
Dickson, A.J. Leng, Melanie 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 |
European Geosciences Union |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/6048/ https://nora.nerc.ac.uk/id/eprint/6048/1/cp-4-333-2008.pdf http://www.climate-of-the-past.net/index.html |
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 |
https://nora.nerc.ac.uk/id/eprint/6048/1/cp-4-333-2008.pdf Dickson, A.J.; Leng, Melanie orcid:0000-0003-1115-5166 Maslin, M.A. 2008 Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12 : implications for atmospheric CO2. Climate of the Past, 4. 333-344. |
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1801379420540239872 |