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PALEOCEANOGRAPHY, VOL. 17, NO. 3, 1030, doi:10.1029/2001PA000667, 2002

Constructing a stacked benthic δ¹⁸O record

Daniel B. Karner

Department of Physics, University of California, Berkeley, California, USA

Jonathan Levine

Department of Physics, University of California, Berkeley, California, USA

Brian P. Medeiros

Department of Physics, University of California, Berkeley, California, USA

Richard A. Muller

Department of Physics, University of California, Berkeley, California, USA

Abstract

Composite stacks were constructed by superimposing 6 to 13 benthic foraminiferal δ¹⁸O records covering the period 0–850 ka. An initial timescale for each core was established using radioisotopic age control points and assuming constant sedimentation rates between these points. The average of these records is our 13-core “untuned” stack. Next, we matched the 41 kyr component of each record individually to variations in Earth's obliquity. Four of the 13 records produced timescales that were inconsistent with one or more of the known radioisotopic ages. The nine remaining cores were averaged to create a “minimally tuned” stack. Six of the minimally tuned cores were assembled into a “tropical” stack. For each stack we estimated the uncertainty envelope from the standard deviation of the constituents. Spectral analysis of the three stacks indicates that benthic δ¹⁸O is dominated by a 100 kyr oscillation that has a narrow spectral peak. The contribution of precession to the total variance is small when compared to prior results from planktic stacks.

Published 20 July 2002.

Index Terms: 3344 Meteorology and Atmospheric Dynamics: Paleoclimatology; 4804 Oceanography: Biological and Chemical: Benthic processes/benthos; 5416 Planetology: Solid Surface Planets: Glaciation.

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Citation: Karner, D. B., J. Levine, B. P. Medeiros, and R. A. Muller (2002), Constructing a stacked benthic δ¹⁸O record, Paleoceanography, 17(3), 1030, doi:10.1029/2001PA000667.

Copyright 2002 by the American Geophysical Union.