{"NOAAStudyId":"6107","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":"2001-08-01","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-6107.xml","doi":null,"earliestYearBP":4500,"earliestYearCE":-2550,"entryId":"noaa-lake-6107","funding":[],"investigators":"Hodell, D.A.; Brenner, M.; Curtis, J.H.; Medina-Gonzalez, R.; Can, E.I.-C.; Albornaz-Pat, A.; Guilderson, T.P.","mostRecentYearBP":-50,"mostRecentYearCE":2000,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/6107","originalSource":null,"publication":[{"abstract":"We studied a 5.1-m sediment core from Aguada X'caamal (20deg 36.6'N, 89deg 42.9'W), a small sinkhole lake in northwest Yucatan, Mexico. Between 1400 and 1500 A.D., oxygen isotope ratios of ostracod and gastropod carbonate increased by an average of 2.2 per mil \r\nand the benthic foraminifer Ammonia beccarii parkinsoniana appeared in the sediment profile, indicating a hydrologic change that included increased lake water salinity.  Pollen from a core \r\nin nearby Cenote San Jose Chulchaca showed a decrease in mesic forest taxa during the same period.  Oxygen isotopes of shell carbonate in sediment cores from Lakes Chichancanab (19deg 53.0'N, 88deg 46.0'W) and Salpeten (16deg 58.6'N, 89deg 40.5'W) to the south \r\nalso increased in the mid-15th century, but less so than in Aguada X'caamal.  Climate change in the 15th century is also supported by historical accounts of cold and famine described \r\nin Maya and Aztec chronicles. We conclude that climate became drier on the Yucatan Peninsula in the 15th century A.D. near the onset of the Little Ice Age (LIA). Comparison of results from the Yucatan Peninsula with other circum-Caribbean paleoclimate records indicates a coherent climate response for this region at the beginning of the LIA. At that time, sea surface temperatures cooled and aridity in the circum-Caribbean region increased. ","author":{"name":"Hodell, D.A., M. Brenner, J.H. Curtis, R. Medina-Gonzalez, M.F. Rosenmeier, T.P. Guilderson, E.I.-C Can, A. Albornaz-Pat, and T.P. Guilderson"},"citation":"Hodell, D.A., M. Brenner, J.H. Curtis, R. Medina-Gonzalez, M.F. Rosenmeier, T.P. Guilderson, E.I.-C Can, A. Albornaz-Pat, and T.P. Guilderson. 2005. Climate change on the Yucatan Peninsula during the Little Ice Age. Quaternary Research, 63, 109-121. doi: 10.1016/j.yqres.2004.11.004","edition":null,"identifier":{"id":"10.1016/j.yqres.2004.11.004","type":"doi","url":"http://dx.doi.org/10.1016/j.yqres.2004.11.004"},"issue":null,"journal":"Quaternary Research","pages":"109-121","pubRank":"1","pubYear":2005,"reportNumber":null,"title":"Climate change on the Yucatan Peninsula during the Little Ice Age","type":"publication","volume":"63"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"20560","geo":{"geoType":"Feature","geometry":{"coordinates":["20.61","-89.715"],"type":"POINT"},"properties":{"easternmostLongitude":"-89.715","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"20.61","southernmostLatitude":"20.61","westernmostLongitude":"-89.715"}},"locationName":"Continent>North America>Mexico>Yucatan","mappable":"Y","paleoData":[{"NOAADataTableId":"9410","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/aguada-xcaamal2005.txt","linkText":"aguada-xcaamal2005.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":"corrected to sediment water interface","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":"radiocarbon year before present","cvWhat":"age variable>age"},{"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":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":"percent","cvWhat":"geological material>identified mineral>carbonate"},{"cvAdditionalInfo":"Darwinula stevensoni","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>ostracod","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"Pyrgophorus coronatus","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"Pyrgophorus coronatus","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>gastropod","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"charophyte encrustation","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":"charophyte encrustation","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"Darwinula stevensoni","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>ostracod","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/yucatan/aguada-xcaamal2005.xls","linkText":"aguada-xcaamal2005.xls","urlDescription":"Data","variables":[]}],"dataTableName":"Aguada X'caamal Core XCAAMAL","dataTableNotes":null,"earliestYear":4500,"earliestYearBP":4500,"earliestYearCE":-2550,"mostRecentYear":-50,"mostRecentYearBP":-50,"mostRecentYearCE":2000,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Aguada X'caamal"}],"studyCode":null,"studyName":"Aguada X'caamal, Mexico 4,500 Year Stable Isotope Data","studyNotes":"Stable isotopic data (d18O and d13C) with radiocarbon ages, from ostracod and gastropod samples taken in Lake Peten-Itza, Guatemala  (1993 core).  These data were used to reconstruct precipitation/evaporation ratios as a paleo-drought indicator.","version":"1.0","xmlId":"675"}