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Late Pleistocene-Holocene Oceanographic Changes in the Northeastern Pacific

Published online by Cambridge University Press:  20 January 2017

Ted C. Moore Jr.
Ted C. Moore Jr.*
Affiliation:
CLIMAP, School of Oceanography, Oregon State University, Corvallis, Oregon 97331 USA
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Abstract

The distributions of the radiolarian assemblages in the Northeastern Pacific Ocean were determined and correlated with the average summer temperature of the near surface waters of this region. These assemblages were compared with those in three sediment cores taken beneath the Transition Zone waters. This comparison indicates that the assemblage off Oregon at the last maximum cold interval (24,000 yr B.P.) was like that now found off southern Alaska. The correlation of the radiolarian assemblages with temperature gives an estimate of 11°C for the average summer temperature at that time. This is approximately 4°C cooler than present day conditions in the area. Superimposed on the general warming trend that began 24,000 y.a., there are minor oscillations in the assemblages which correspond to estimates of temperature change of about 2°C in the Pleistocene and about 1°C in the Holocene. In the Holocene, these minor warm intervals appear to be approximately synchronous with advances in mountain glaciers.

Type
Original Articles
Information
Quaternary Research , Volume 3 , Issue 1 , June 1973 , pp. 99 - 109
Copyright
University of Washington

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