HR: 0800h
AN: PP41B-0640    [Abstracts]
TI: Ocean Climate Variability in the Eastern North Atlantic During Interglacial MIS 11: A Partial Analogue to the Holocene?
AU: * de Abreu, L
EM: luciaabreu@yahoo.com
AF: University of Cambridge - Department of Earth Sciences - Godwin Laboratory, Downing Site, Cambridge, CB2 3SA United Kingdom
AU: * de Abreu, L
EM: luciaabreu@yahoo.com
AF: INETI - Departamento de Geologia Marinha, Estrada da Portela, Zambujal, Alfragide, 2700 Portugal
AU: Abrantes, F
EM: fatima.abrantes@ineti.pt
AF: INETI - Departamento de Geologia Marinha, Estrada da Portela, Zambujal, Alfragide, 2700 Portugal
AU: Voelker, A
EM: antje.voelker@ineti.pt
AF: INETI - Departamento de Geologia Marinha, Estrada da Portela, Zambujal, Alfragide, 2700 Portugal
AU: Shackleton, N J
EM: njs5@esc.cam.ac.uk
AF: University of Cambridge - Department of Earth Sciences - Godwin Laboratory, Downing Site, Cambridge, CB2 3SA United Kingdom
AU: Tzedakis, P
EM: p.c.tzedakis@leeds.ac.uk
AF: University of Cambridge - Department of Earth Sciences - Godwin Laboratory, Downing Site, Cambridge, CB2 3SA United Kingdom
AU: Tzedakis, P
EM: p.c.tzedakis@leeds.ac.uk
AF: Earth and Biosphere Institute -School of Geography - University of Leeds, School of Geography, University of West Yorkshire, Leeds, LS2 9JT United Kingdom
AU: McManus, J
EM: jmcmanus@whoi.edu
AF: Woods Hole Oceanographic Institution, Department of Geology and Geophysics - Quisset Campus, Woods Hole, MA 02543 MA United States
AU: Oppo, D
EM: doppo@whoi.edu
AF: Woods Hole Oceanographic Institution, Department of Geology and Geophysics - Quisset Campus, Woods Hole, MA 02543 MA United States
AU: Salgueiro, E
EM: emilia.salgueiro@ineti.pt
AF: INETI - Departamento de Geologia Marinha, Estrada da Portela, Zambujal, Alfragide, 2700 Portugal
AU: Hall, M
EM: mah2@cam.ac.uk
AF: University of Cambridge - Department of Earth Sciences - Godwin Laboratory, Downing Site, Cambridge, CB2 3SA United Kingdom
AB: Similar orbital geometry and greenhouse gases 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 kyrs, indicating a Holocene unperturbed by human activity might last an additional 6-7 kyrs. 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 18O values, particularly during 7e, indicating colder SSTs and a larger residual ice-volume. Benthic 13C 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.
DE: 1605 Abrupt/rapid climate change (4901, 8408)
DE: 4900 PALEOCEANOGRAPHY (0473, 3344)
DE: 4940 Isotopic stage
DE: 4944 Micropaleontology (0459, 3030)
DE: 4954 Sea surface temperature
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005