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Development of the California Current during the past 12,000??yr based on diatoms and silicoflagellates

Palaeogeography, Palaeoclimatology, Palaeoecology

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DOI: 10.1016/j.palaeo.2006.12.009

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Abstract

Detailed diatom and silicoflagellates records in three cores from the offshore region of southern Oregon to central California reveal the evolution of the northern part of the California Current during the past 12,000??yr. The early Holocene, prior to ??? 9??ka, was characterized by relatively warm sea surface temperatures (SST), owing to enhanced northerly flow of the subtropical waters comparable to the modern Davidson Current. Progressive strengthening of the North Pacific High lead to intensification of the southward flow of the California Current at ??? 8??ka, resulting in increased coastal upwelling and relatively cooler SST which persisted until ??? 5??ka. Reduced southward flow of the California Current between ??? 4.8??ka and 3.6??ka may have been responsible for a period of decreased upwelling. Modern seasonal oceanographic cycles, as evidenced by increased spring-early summer coastal upwelling and warming of early fall SST evolved between 3.5 and 3.2??ka. Widespread occurrence of paleoceanographic and paleoclimatic change between ??? 3.5-3.0??ka??along the eastern margins of the North Pacific was likely a response to increasing ENSO variability in the tropical Pacific.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Development of the California Current during the past 12,000??yr based on diatoms and silicoflagellates
Series title:
Palaeogeography, Palaeoclimatology, Palaeoecology
DOI:
10.1016/j.palaeo.2006.12.009
Volume
248
Issue:
3-4
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Palaeogeography, Palaeoclimatology, Palaeoecology
First page:
313
Last page:
338
Number of Pages:
26