| PALEOLIMNOLOGY |
An ~15,000-Year Record of El Niño-Driven Alluviation in Southwestern Ecuador
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Rodbell, D.. 1999. An ~15,000-Year Record of El Niño-Driven Alluviation in Southwestern Ecuador. Science Vol. 283, pp. 516-520,
January 22, 1999
| Data Coverage |
North: 2.76667 * South: 2.76667 |
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West: -79.23333 * East: -79.23333 |
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Altitude: 4200 m |
Start Year: 15142 cal yr BP * End Year: -26 cal yr BP
Data: Please Cite Data Contributors!
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Summary: Debris flows have deposited inorganic laminae in an alpine lake that is 75 kilometers east of the Pacific Ocean, in Ecuador.
These storm-induced events were dated by radiocarbon, and the age of laminae that are less than 200 years old matches the
historic record of El Niño events. From about 15,000 to about 7000 calendar years before the present, the periodicity of clastic
deposition is greater than or equal to 15 years; thereafter, there is a progressive increase in frequency to periodicities
of 2 to 8.5 years. This is the modern El Niño periodicity, which was established about 5000 calendar years before the present.
This may reflect the onset of a steeper zonal sea surface temperature gradient, which was driven by enhanced trade winds.
More Info on Paleolimnology |
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Complete XML Record: noaa-lake-5487
(Last Revised: 2007-09-05 )
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DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
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