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Interglacials of the last 800,000 years 5
Berger, A.; Crucifix, M.; Hodell, D. A.; Mangili, C.; Mcmanus, J. F.; Otto-bliesner, B.; Pol, K.; Raynaud, D.; Skinner, L. C.; Tzedakis, P. C.; Wolff, E. W.; Yin, Q. Z.; Abe-ouchi, A.; Barbante, C.; Brovkin, V.; Cacho, I.; Capron, E.; Ferretti, P.; Ganopolski, A.; Grimalt, J. O.; Hoenisch, B.; Kawamura, K.; Landais, A.; Margari, V.; Martrat, B.; Masson-delmotte, V.; Mokeddem, Zohra; Parrenin, F.; Prokopenko, A. A.; Rashid, H.; Schulz, M.; Riveiros, N. Vazquez.
Interglacials, including the present (Holocene) period, are warm, low land ice extent (high sea level), end-members of glacial cycles. Based on a sea level definition, we identify eleven interglacials in the last 800,000years, a result that is robust to alternative definitions. Data compilations suggest that despite spatial heterogeneity, Marine Isotope Stages (MIS) 5e (last interglacial) and 11c (similar to 400ka ago) were globally strong (warm), while MIS 13a (similar to 500ka ago) was cool at many locations. A step change in strength of interglacials at 450ka is apparent only in atmospheric CO2 and in Antarctic and deep ocean temperature. The onset of an interglacial (glacial termination) seems to require a reducing precession parameter (increasing...
Tipo: Text Palavras-chave: Interglacials; Review; Quaternary.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00340/45150/44547.pdf
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Ocean climate variability in the eastern North Atlantic during interglacial marine isotope stage 11: A partial analogue to the Holocene? 5
De Abreu, C; Abrantes, Ff; Shackleton, Nj; Tzedakis, Pc; Mcmanus, Jf; Oppo, Dw; Hall, Ma.
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...
Tipo: Text Palavras-chave: Stage 11; Interglacials; Planktonic foraminifera; Stable isotopes; Western Iberian margin; Eastern North Atlantic.
Ano: 2005 URL: https://archimer.ifremer.fr/doc/00233/34407/32828.pdf
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Tracking rainfall in the northern Mediterranean borderlands during sapropel deposition 5
Toucanne, Samuel; Mintoo, Charlie Morelle Angue; Fontanier, Christophe; Bassetti, Maria-angela; Jorry, Stephan; Jouet, Gwenael.
The role of mid-latitude precipitation in the hydrological forcing leading to the deposition of sapropels in the Mediterranean Sea remains unclear. The new GDEC-4-2 borehole, East Corsica margin (northern Tyrrhenian Sea), provides the first precisely dated evidence for enhanced rainfall in the Western Mediterranean during warm intervals of interglacial periods over the last 547 kyr. Comparison of GDEC-4-2 proxy records with pollen sequences and speleothems from the central and eastern Mediterranean reveals that these pluvial events were regional in character and occurred probably in response to the intensification of the Mediterranean storm track along the northern Mediterranean borderlands in autumn/winter. Our dataset suggests that the timing of maxima...
Tipo: Text Palavras-chave: Mediterranean; Rainfall; Interglacials; Sapropel.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00287/39804/38301.pdf
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