{"NOAAStudyId":"6108","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2008-04-01","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-6108.xml","doi":null,"earliestYearBP":4500,"earliestYearCE":-2550,"entryId":"noaa-lake-6108","funding":[],"investigators":"Hodell, D.A.; Brenner, M.; Curtis, J.H.","mostRecentYearBP":-50,"mostRecentYearCE":2000,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/6108","originalSource":null,"publication":[{"abstract":"We present new density records from sediment cores taken along a depth transect in Lake Chichancanab, Mexico. The data reveal in great detail the climatic events that comprised the Terminal Classic Drought (TCD) and coincided with the demise of Classic Maya civilization between ca 750 and 1050 AD. In shallow-water cores, the TCD is marked by a condensed gypsum horizon. In deeper-water sections it is expanded and represented by numerous interbedded gypsum and organic-rich strata. The TCD was not a single, two-century-long megadrought, but rather consisted of a series of dry events separated by intervening periods of relatively moister conditions. We estimate the TCD occurred between ca 770 and 1100 AD and included an early phase (ca 770ŋ870 AD) and late phase (ca 920ŋ1100 AD). The intervening 50-year period (ca 870ŋ920 AD) was relatively moister. Each dry phase is represented by multiple gypsum (density) bands interbedded with organic-rich sediment that indicate alternating dry and wet conditions. Spectral analysis revealed significant periods around 213, 50, and 27 years. Despite uncertainty regarding the ages of these events, their pattern is robust and generally consistent with other proxy records under the same climate regime, such as the marine Cariaco Basin off northern Venezuela (Science 299 (2003) 1731).","author":null,"citation":"Hodell, D.A.,Brenner, M.,Curtis, J.H. 2005. Terminal Classic drought in the northern Maya Lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico). Quaternary Science Reviews, Vol. 24, pp. 1413-1427","edition":null,"identifier":null,"issue":null,"journal":"Quaternary Science Reviews","pages":null,"pubRank":"1","pubYear":2005,"reportNumber":null,"title":"Terminal Classic drought in the northern Maya Lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico)","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"8962","geo":{"geoType":"Feature","geometry":{"coordinates":["19.855","-88.763"],"type":"POINT"},"properties":{"easternmostLongitude":"-88.763","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"19.855","southernmostLatitude":"19.855","westernmostLongitude":"-88.763"}},"locationName":"Continent>North America>Mexico>Yucatan","mappable":"Y","paleoData":[{"NOAADataTableId":"9411","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/chichancanab2005.txt","linkText":"chichancanab2005.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"gram per cubic centimeter","cvWhat":"physical property>density"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/chichancanab2005.xls","linkText":"chichancanab2005.xls","urlDescription":"Data","variables":[]}],"dataTableName":"LAKECHIC density","dataTableNotes":null,"earliestYear":4500,"earliestYearBP":4500,"earliestYearCE":-2550,"mostRecentYear":-50,"mostRecentYearBP":-50,"mostRecentYearCE":2000,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake Chichancanab"}],"studyCode":null,"studyName":"Lake Chichancanab, Mexico 4,500 Year Sediment Density Data","studyNotes":"Density data from Lake Chichancanab, Core CH1 7-III-04, 14.4m water depth.","version":"1.0","xmlId":"647"}