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Originally published in Science Express on 7 June 2001
Science 6 July 2001:
Vol. 293. no. 5527, pp. 71 - 76
DOI: 10.1126/science.1059209
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Research Articles

Collapse of the California Current During Glacial Maxima Linked to Climate Change on Land

T. D. Herbert,1* J. D. Schuffert,1 D. Andreasen,2 L. Heusser,3 M. Lyle,4 A. Mix,5 A. C. Ravelo,2 L. D. Stott,6 J. C. Herguera7

Time series of alkenone unsaturation indices gathered along the California margin reveal large (4° to 8°C) glacial-interglacial changes in sea surface temperature (SST) over the past 550,000 years. Interglacial times with SSTs equal to or exceeding that of the Holocene contain peak abundances in the pollen of redwood, the distinctive component of the temperate rainforest of the northwest coast of California. In the region now dominated by the California Current, SSTs warmed 10,000 to 15,000 years in advance of deglaciation at each of the past five glacial maxima. SSTs did not rise in advance of deglaciation south of the modern California Current front. Glacial warming along the California margin therefore is a regional signal of the weakening of the California Current during times when large ice sheets reorganized wind systems over the North Pacific. Both the timing and magnitude of the SST estimates suggest that the Devils Hole (Nevada) calcite record represents regional but not global paleotemperatures, and hence does not pose a fundamental challenge to the orbital ("Milankovitch") theory of the Ice Ages.

1 Department of Geological Sciences, Brown University, Providence, RI 02912, USA.
2 University of California, Santa Cruz, CA 95064, USA.
3 Lamont-Doherty Earth Observatory, Palisades, NY 10964, USA.
4 Center for Geophysical Investigation of the Shallow Subsurface, Boise State University, Boise, ID 83725, USA.
5 Oregon State University, Corvallis, OR 97331, USA.
6 University of Southern California, Los Angeles, CA 90089, USA.
7 Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada 22860, Mexico.
*   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Eelgrass Meadows in the California Channel Islands and Adjacent Coast Reveal a Mosaic of Two Species, Evidence for Introgression and Variable Clonality.
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Diversification Before the Most Recent Glaciation in Balanus glandula.
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Structure of the penultimate deglaciation along the California margin and implications for Milankovitch theory.
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Carbon starvation in glacial trees recovered from the La Brea tar pits, southern California.
J. K. Ward, J. M. Harris, T. E. Cerling, A. Wiedenhoeft, M. J. Lott, M.-D. Dearing, J. B. Coltrain, and J. R. Ehleringer (2005)
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The California Current, Devils Hole, and Pleistocene Climate.
I. J. Winograd, T. D. Herbert, J. D. Schuffert, D. Andreasen, L. Heusser, M. Lyle, A. Mix, A. C. Ravelo, L. D. Stott, and J. C. Herguera (2002)
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C. D. Gallup, H. Cheng, F. W. Taylor, and R. L. Edwards (2002)
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(2001)
Geology 29, 1115-1118


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