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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.
Read Full Article (file size: 929549 bytes) Cited by
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.
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