{"NOAAStudyId":"5483","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":"2001-02-01","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-5483.xml","doi":null,"earliestYearBP":10920,"earliestYearCE":-8970,"entryId":"noaa-lake-5483","funding":[],"investigators":"Hodell, D.A.","mostRecentYearBP":-26,"mostRecentYearCE":1976,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/5483","originalSource":null,"publication":[{"abstract":"THE Maya civilization developed around 3,000 years ago in Mesoamerica, and after flourishing during the so-called Classic period, it collapsed around 750-900 AD. It has been speculated that climate change may have played a part in this collapse. But efforts to reconstruct the last three millennia of Mesoamerican climate using palynological methods have met with equivocal success, because human-mediated deforestation has altered regional vegetation in ways that mimic climate shifts, making it difficult to discriminate between natural and anthropogenic changes. Here we use temporal variations in oxygen isotope and sediment composition in a 4.9-m sediment core from Lake Chichancanab, Mexico, to reconstruct a continuous record of Holocene climate change for the central Yucatan peninsula. The interval between 1,300 and 1,100 yr BP (AD 800-1,000) was the driest of the middle to late Holocene epoch, and coincided with the collapse of Classic Maya civilization. This continuous climate proxy record thus provides evidence of climate deterioration in the Maya region during the terminal Classic period.","author":null,"citation":"Hodell, D.A.. 1995. Possible role of climate in the collapse of the Classic Maya Civilization. Nature Vol. 375, pp. 391-394","edition":null,"identifier":null,"issue":null,"journal":"Nature","pages":null,"pubRank":"1","pubYear":1995,"reportNumber":null,"title":"Possible role of climate in the collapse of the Classic Maya Civilization","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["drought"],"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":"7282","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry","earth science>paleoclimate>paleolimnology>population abundance","earth science>paleoclimate>paleolimnology>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/chichancanab.txt","linkText":"chichancanab.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"Pyrgophorus sp.","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"Physocypria sp.","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>ostracod","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"Physocypria sp.","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological 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material>organism>foraminifer","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"Ammonia beccarii","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"Ammonia beccarii","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count","cvWhat":"biological material>organism>foraminifer>identified foraminifer"},{"cvAdditionalInfo":"terrestrial gastropods","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"terrestrial gastropods","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"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":"calendar year before present","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":"percent","cvWhat":"geological material>identified mineral>carbonate>calcium carbonate"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>sulfur"},{"cvAdditionalInfo":"Pyrgophorus sp.","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"radiocarbon year before present","cvWhat":"age variable>age"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>population abundance","earth science>paleoclimate>paleolimnology>geochemistry","earth science>paleoclimate>paleolimnology>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/chichancanab.xls","linkText":"chichancanab.xls","urlDescription":"Data","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>lake level","earth science>paleoclimate>paleolimnology>population abundance"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/readme_chichancanab.txt","linkText":"readme_chichancanab.txt","urlDescription":"Readme","variables":[]}],"dataTableName":"LAKECHIC isotope and mineral","dataTableNotes":null,"earliestYear":10920,"earliestYearBP":10920,"earliestYearCE":-8970,"mostRecentYear":-26,"mostRecentYearBP":-26,"mostRecentYearCE":1976,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake Chichancanab"}],"studyCode":null,"studyName":"Lake Chichancanab, Mexico 9,700 Year Isotope and Mineralogy Data","studyNotes":"Oxygen isotope and sediment composition data from Lake Chichancanab, Mexico. The data are interpreted as a moisture balance proxy, and indicate drought conditions in the years 800-1000 AD, corresponding to the collapse of the Classic Maya civilization.","version":"1.0","xmlId":"688"}