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- W1566922040 abstract "A core from the western end of the subtropical gyre (ODP Leg 172 Site 1060, 31°45N, 74°24W, 3400 m water depth) in close proximity with the Gulf Stream was studied at high resolution to clarify the surface hydrology changes involved during the last interglacial, their relations and impact over deep circulation as well as continental climate as recorded by pollen. The occurrence of high-frequency cold events at subtropical latitudes is also examined. For the time span from 134 to 108 kyr, eight distinct periods can be recognised on the basis of planktonic foraminifera assemblages. These faunal changes are related mainly to changes in the summer stratification tracing the Gulf Stream current influence and late winter mixing controlling the formation of the subtropical mode water. In addition, our results indicate that during the deglaciation, the sea level rise first during 4 kyr, while sea-surface temperatures stay cold. Only at 128 kyr do the two vary in phase sharply and rapidly; after that date the Gulf Stream increases its influence and reaches a maximum on the core site after 125 kyr. Therefore, the onset of the warm current seems to predate by 2 kyr the onset of the Eemian on land as recorded off Portugal. During the interval 122-116, the sea-surface temperatures are maximum in winter but start to decrease in summer. Superimposed on this cooling trend, we found several high-frequency cooling events better marked in winter (around 2°C). For most of these, cooling peaks of lithic concentration (90–150 m) probably representing periodic ice rafting to the core site were found. We found that the repeated pacing of these events is about 1400 years." @default.
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- W1566922040 date "2007-01-01" @default.
- W1566922040 modified "2023-09-23" @default.
- W1566922040 title "20. Subtropical NW Atlantic surface water variability during the last interglacial" @default.
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- W1566922040 doi "https://doi.org/10.1016/s1571-0866(07)80045-5" @default.
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