Development of the California Current during the past 12,000 yr based on diatoms and silicoflagellates
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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.
Study Area
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 |
Publisher | Elsevier |
Contributing office(s) | Volcano Science Center |
Description | 26 p. |
First page | 313 |
Last page | 338 |
Country | United States |
State | California, Oregon |
Online Only (Y/N) | N |
Additional Online Files (Y/N) | N |
Google Analytic Metrics | Metrics page |