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Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2

Dickson, AJ; Leng, MJ; Maslin, MA; (2008) Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2. Climate of the Past , 4 (4) 333 - 344. 10.5194/cp-4-333-2008. Green open access

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Abstract

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 deep-waters consistently penetrated to at least 30 degrees 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 delta C-13 gradient shows that a reduction in deep Southern Ocean ventilation at the end of MIS-11 was consistent with a modelled CO2 drawdown of similar to 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 similar to 45 ppm drawdown.

Type: Article
Title: Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2
Open access status: An open access version is available from UCL Discovery
DOI: 10.5194/cp-4-333-2008
Publisher version: http://dx.doi.org/10.5194/cp-4-333-2008
Language: English
Additional information: © Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License. Anyone (the author, his/her institution/company, the publisher, as well as the public) is free to copy, distribute, transmit, and adapt the work as long as the original author is given credit.
Keywords: Deep-water circulation, subpolar north-atlantic, millennial-scale changes, last glacial maximum, vostok ice core, late pleistocene, thermohaline circulation, benthic foraminifera, carbon-isotope, climate
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/140934
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