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Sediment-Color Record from the Northeast Atlantic Reveals Patterns of Millennial-Scale Climate Variability during the Past 500,000 Years

Published online by Cambridge University Press:  20 January 2017

Jan P. Helmke ,
Michael Schulz  and
Henning A. Bauch
Jan P. Helmke
Affiliation:
GEOMAR Research Center for Marine Geosciences, Wischhofstr. 1-3, D-24148 Kiel, Germany
Michael Schulz
Affiliation:
Institute for Geosciences, University of Kiel, Olshausenstrasse 40, D-24118 Kiel, Germany
Henning A. Bauch
Affiliation:
Alfred-Wegener Institute for Polar and Marine Research, Columbusstrasse, D-27568 Bremerhaven, Germany
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Abstract

A 500,000-yr-long deep-sea sediment-color record from the Northeast Atlantic was investigated to reconstruct the evolution of late Pleistocene climate variability on millennial time scales. Variations of the red–green color intensity are probably caused by climatically induced changes in the ice-rafted input of red-colored iron-bearing terrigenous material to the core site. The resolution of the age model impedes the detection of distinct spectral features at sub-Milankovitch periodicities. Hence, millennial-scale climate variability is quantified as time-dependent variance of the high-pass filtered color time series. The course of the estimated variance shows distinct patterns, which can be linked to continental ice mass. During the past 500,000 yr, large-amplitude millennial-scale climate variability occurs only if continental ice mass exceeds a threshold level, equivalent to sea level at approximately 40% of the lowering during the last glacial maximum.

Keywords

sediment colorNortheast Atlanticglacial–interglacial climatemillennial-scale variabilitythreshold level
Type
Research Article
Information
Quaternary Research , Volume 57 , Issue 1 , January 2002 , pp. 49 - 57
Copyright
University of Washington

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