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| Cortijo, E; Lehman, S; Keigwin, L; Chapman, M; Paillard, D; Labeyrie, L. |
| Eight deep-sea sediment cores from the North Atlantic Ocean ranging from 31 degrees to 72 degrees N are studied to reconstruct the meridional gradients in surface hydrographic conditions during the interval of minimum ice volume within the last interglacial period. Using benthic foraminiferal delta(18)O measurements and estimates of Sea Surface Temperature (SST) and Sea Surface Salinity (SSS), we show that summer SSTs and SSSs decreased gradually during the interval of minimum ice volume at high-latitude sites (52 degrees-72 degrees N) whereas they were stable or increased during the same time period at low-latitude sites (31 degrees-41 degrees N). This increase in meridional gradients of SSTs and SSSs may have been due to changes in the latitudinal... |
| Tipo: Text |
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| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00240/35076/34550.pdf |
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| Grousset, Fe; Cortijo, E; Huon, S; Herve, L; Richter, T; Burdloff, D; Duprat, J; Weber, O. |
| Theories explaining the origin of the abrupt, massive discharges of ice-rafted detritus (IRD) into the glacial North Atlantic (the Heinrich layers (HLs)) generally point to the Laurentide ice sheet as the sole source of these events, until it was found that the IRDs also originated from Icelandic and European ice sheets [Bond and Lotti, 1995; Snoeckx er al., 1999; Grousset et al., 2000]. This apparent contradiction must be reconciled as it raises fundamental questions about the mechanism(s) of HL origin. We have analyzed two similar to 12 cm thick HLs in an ultrahigh-resolution mode (1-2 century intervals) in a mid-Atlantic ridge piston core. The delta O-18 record (N. pachyderma left coiling) reveals strong excursions induced by the melting of the... |
| Tipo: Text |
Palavras-chave: Climate and interannual variability; Climate dynamics; Radiogenic isotope geochemistry. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00221/33190/31786.pdf |
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