Glacial to Interglacial Fluctuations in Productivity in the Equatorial Pacific as Indicated by Marine Barite
Abstract
An empirical correlation between marine barite (BaSO4) accumulation rate in core-top sediment samples from two equatorial Pacific transects (at 140°W and 110°W) and the estimated primary productivity of the overlying water column were used to evaluate glacial to interglacial changes in productivity. Fluctuations in barite accumulation rates down-core indicate that during glacial periods of the past 450,000 years, the productivity in the central and eastern equatorial Pacific was about two times that during intervening interglacial periods. This result is consistent with other evidence that productivity was high in the eastern and central equatorial Pacific during the last glacial.
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We thank A. C. Mix and R. F. Anderson for sharing their data with us and P. Johnson for assistance in the laboratory. Comments from W. H. Berger and J. Dymond and reviews by P. Froelich and an anonymous reviewer improved this manuscript. This work was supported by funds from the National Science Foundation OCE#91-16010 and the American Chemical Society PRF#27886AC8. Sediment samples were provided by the OSU core repository supported by NSF grant OCE-9102881 and the URI core repository supported by NSF grant OCE-9102410.
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Published In
Science
Volume 274 | Issue 5291
22 November 1996
22 November 1996
Copyright
© 1996 American Association for the Advancement of Science.
Submission history
Received: 7 May 1996
Accepted: 22 October 1996
Published in print: 22 November 1996
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