Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2
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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ftdoajarticles:oai:doaj.org/article:f5ee1516bb504b17a7c6556d583d3f58 2023-05-15T17:25:25+02:00 Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 M. A. Maslin M. J. Leng A. J. Dickson 2008-12-01T00:00:00Z https://doaj.org/article/f5ee1516bb504b17a7c6556d583d3f58 EN eng Copernicus Publications http://www.clim-past.net/4/333/2008/cp-4-333-2008.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 https://doaj.org/article/f5ee1516bb504b17a7c6556d583d3f58 Climate of the Past, Vol 4, Iss 4, Pp 333-344 (2008) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2008 ftdoajarticles 2022-12-31T08:47:52Z 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 δ 13 C gradient shows that a reduction in deep Southern Ocean ventilation at the end of MIS-11 was consistent with a modelled CO 2 drawdown of ~21–30 ppm. Further increases in the Southern Ocean chemical divide during the transition into MIS-10 were completed before minimum CO 2 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 Directory of Open Access Journals: DOAJ Articles Southern Ocean |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. A. Maslin M. J. Leng A. J. Dickson Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 δ 13 C gradient shows that a reduction in deep Southern Ocean ventilation at the end of MIS-11 was consistent with a modelled CO 2 drawdown of ~21–30 ppm. Further increases in the Southern Ocean chemical divide during the transition into MIS-10 were completed before minimum CO 2 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 |
M. A. Maslin M. J. Leng A. J. Dickson |
author_facet |
M. A. Maslin M. J. Leng A. J. Dickson |
author_sort |
M. A. Maslin |
title |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
title_short |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
title_full |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
title_fullStr |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
title_full_unstemmed |
Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO 2 |
title_sort |
mid-depth south atlantic ocean circulation and chemical stratification during mis-10 to 12: implications for atmospheric co 2 |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doaj.org/article/f5ee1516bb504b17a7c6556d583d3f58 |
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_source |
Climate of the Past, Vol 4, Iss 4, Pp 333-344 (2008) |
op_relation |
http://www.clim-past.net/4/333/2008/cp-4-333-2008.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 https://doaj.org/article/f5ee1516bb504b17a7c6556d583d3f58 |
_version_ |
1766116832051200000 |