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Ocean climate variability in the eastern North Atlantic during interglacial marine isotope stage 11: A partial analogue to the Holocene?

de Abreu, C; Abrantes, FF; Shackleton, NJ; Tzedakis, PC; McManus, JF; Oppo, DW; Hall, MA; (2005) Ocean climate variability in the eastern North Atlantic during interglacial marine isotope stage 11: A partial analogue to the Holocene? Paleoceanography , 20 (3) , Article PA3009. 10.1029/2004PA001091. Green open access

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Abstract

Similar orbital geometry and greenhouse gas concentrations during marine isotope stage 11 ( MIS 11) and the Holocene make stage 11 perhaps the best geological analogue period for the natural development of the present interglacial climate. Results of a detailed study of core MD01-2443 from the Iberian margin suggest that sea surface conditions during stage 11 were not significantly different from those observed during the elapsed portion of the Holocene. Peak interglacial conditions during stage 11 lasted nearly 18 kyr, indicating a Holocene unperturbed by human activity might last an additional 6-7 kyr. A comparison of sea surface temperatures ( SST) derived from planktonic foraminifera for all interglacial intervals of the last million years reveals that warm temperatures during peak interglacials MIS 1, 5e, and 11 were higher on the Iberian margin than during substage 7e and most of 9e. The SST results are supported by heavier delta(18)O values, particularly during 7e, indicating colder SSTs and a larger residual ice volume. Benthic delta(13)C results provide evidence of a strong influence of North Atlantic Deep Water at greater depths than present during MIS 11. The progressive ocean climate deterioration into the following glaciation is associated with an increase in local upwelling intensity, interspersed by periodic cold episodes due to ice- rafting events occurring in the North Atlantic.

Type: Article
Title: Ocean climate variability in the eastern North Atlantic during interglacial marine isotope stage 11: A partial analogue to the Holocene?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2004PA001091
Publisher version: http://dx.doi.org/10.1029/2004PA001091
Language: English
Additional information: Copyright 2005 by the American Geophysical Union
Keywords: Deep-water circulation, Western Iberian margin, Antarctic ice, Planktonic-foraminifera, Mediterranean outflow, Middle Pleistocene, Portuguese margin, Heinrich events, South Atlantic, Nordic seas
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/125818
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