Molecular stratigraphy of cores off northwest Africa: Sea surface temperature history over the last 80 Ka

Molecular stratigraphy of cores off northwest Africa: Sea surface temperature history over the... The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10′W) and Ocean Drilling Program Hole 658C (20°45′N, 18°35′W;) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (∼circa 200–500 years). The derived Uk37′ sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°‐4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the NE Atlantic, associated with “Heinrich events.” Our results indicate that meltwater produced by these ice‐rafting events was transmitted southward by the Canary Current, where it had considerable impact on sea surface temperatures in the subtropical eastern Atlantic. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Paleoceanography Wiley

Molecular stratigraphy of cores off northwest Africa: Sea surface temperature history over the last 80 Ka

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Publisher
Wiley
Copyright
Copyright © 1995 by the American Geophysical Union.
ISSN
0883-8305
eISSN
1944-9186
D.O.I.
10.1029/94PA03354
Publisher site
See Article on Publisher Site

Abstract

The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10′W) and Ocean Drilling Program Hole 658C (20°45′N, 18°35′W;) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (∼circa 200–500 years). The derived Uk37′ sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°‐4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the NE Atlantic, associated with “Heinrich events.” Our results indicate that meltwater produced by these ice‐rafting events was transmitted southward by the Canary Current, where it had considerable impact on sea surface temperatures in the subtropical eastern Atlantic.

Journal

PaleoceanographyWiley

Published: Jun 1, 1995

References

  • Deep thermohaline circulation in the low‐latitude Atlantic during the last glacial
    Beveridge, Beveridge; Elderfield, Elderfield; Shackleton, Shackleton
  • Binge/purge oscillations of the Laurentide ice‐sheet as a cause of the North‐Atlantic Heinrich events.
    MacAyeal, MacAyeal
  • The early diagenesis of lipid biomarker compounds in North Atlantic sediments
    Madureira, Madureira; Conte, Conte; Eglinton, Eglinton
  • Chronology for climate change: Developing age models for the Biogeochemical Oceanic Flux Study cores
    Manighetti, Manighetti; Maslin, Maslin; Shackleton, Shackleton; McCave, McCave
  • Surface water response of the equatorial Atlantic Ocean to orbital forcing
    McIntyre, McIntyre; Ruddiman, Ruddiman; Karlin, Karlin; Mix, Mix

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