Laguna Pallcacocha, Ecuador 15KYr Sediment Gray Scale Data Rodbell, D. Rodbell, D. PAGES 2k Network PAGES LOTRED SA2k earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (grayscale,sediment,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Laguna Pallcacocha>LATITUDE -2.76667>LONGITUDE -79.23333) 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. STUDY NOTES: Ecuador Alluvial Sediment Gray Scale Data, used as long term El Nino proxy. Light-colored laminae of inorganic clastic sediments are indicitive of El Nino-driven heavy precipitation events. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Rodbell, D. 2000-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5487 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/readme_rodbell1999.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/readme_rodbell1999.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.txt English https://www.ncdc.noaa.gov/paleo/study/5487 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/readme_rodbell1999.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.txt Donald T. Rodbell, Geoffrey O. Seltzer, David M. Anderson, Mark B. Abbott, David B. Enfield, and Jeremy H. Newman 1999An ~15,000-Year Record of El Niño-Driven Alluviation in Southwestern Ecuador Science2835401516-52010.1126/science.283.5401.516http://www.sciencemag.org/content/283/5401/516.abstract?sid=819f1e00-a36c-43be-9176-0a8f7c555ec4 START YEAR: 15090 cal yr BP * END YEAR: -26 cal yr BP -79.23333 -2.76667 -79.23333 -2.76667