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Central Arctic Ocean Response to Pleistocene Earth-Orbital Variations

Published online by Cambridge University Press:  20 January 2017

Robin F. Boyd ,
David L. Clark ,
Glenn Jones ,
W.F. Ruddiman ,
A. McIntyre  and
N.G. Pisias
Robin F. Boyd
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706
David L. Clark
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706
Glenn Jones
Affiliation:
Lamont-Doherty Geological Observatory, Palisades, New York 10964
W.F. Ruddiman
Affiliation:
Lamont-Doherty Geological Observatory, Palisades, New York 10964
A. McIntyre
Affiliation:
Lamont-Doherty Geological Observatory, Palisades, New York 10964
N.G. Pisias
Affiliation:
Department of Oceanography, Oregon State University, Corvallis, Oregon 97331
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Abstract

Three central Arctic Ocean sediment cores were sampled for percentage carbonate, number of foraminifera, and texture. These three parameters were used in spectral analyses to test the idea that the ice-covered Arctic Ocean may respond to orbital forcing in a different manner than has been indicated for lower latitude ice-free oceans. The record for two of the cores represents approximately 1 my, and the record for the third, approximately 400,000 yr. The 100,000-yr frequency is well represented in all of the cores. A 40,000-yr frequency may be present, as well. An unexpected 70,000-yr frequency occurs in most of the spectra and may reflect nonlinear sedimentation rates or the combined effect of obliquity and eccentricity. The strong 100,000-yr signal confirms that, in spite of ice feedback, the Arctic Ocean has responded to orbital forcing in much the same manner as have ice-free oceans.

Type
Research Article
Information
Quaternary Research , Volume 22 , Issue 1 , July 1984 , pp. 121 - 128
Copyright
University of Washington

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