noaa-lake-5487 Laguna Pallcacocha, Ecuador 15KYr Sediment Gray Scale Data Rodbell, D. Laguna Pallcacocha, Ecuador 15KYr Sediment Gray Scale Data 2000-01-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5487 Investigator D. Rodbell 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 physical properties earth science paleoclimate paleolimnology lake level geoscientificInformation PAGES 2k Network PAGES LOTRED SA2k 15090 cal yr BP -26 cal yr BP Complete -2.76667 -2.76667 -79.23333 -79.23333 4200 4200 Continent South America Ecuador Laguna Pallcacocha>LATITUDE -2.76667>LONGITUDE -79.23333 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Donald T. Rodbell, Geoffrey O. Seltzer, David M. Anderson, Mark B. Abbott, David B. Enfield, and Jeremy H. Newman 1999 Science 283 5401 516-520 10.1126/science.283.5401.516 http://www.sciencemag.org/content/283/5401/516.abstract?sid=819f1e00-a36c-43be-9176-0a8f7c555ec4

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/readme_rodbell1999.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/ecuador/pallcacocha_grayscale.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11