{"NOAAStudyId":"21550","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":"2017-02-27","dataPublisher":"NOAA","dataType":"SPELEOTHEMS","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/speleothem","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-cave-21550.xml","doi":null,"earliestYearBP":2000,"earliestYearCE":-50,"entryId":"noaa-cave-21550","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ATM 1420079, AGS 1602962, EAR 1535824, MRI 0959524 "}],"investigators":"Wortham, B.E.; Wong, C.I.; Silva, L.C.R.; McGee, D.; Montañez, I.P.; Rasbury, E.T.; Cooper, K.M.; Sharp, W.D.; Glessner, J.J.G.; Santos, R.V.","mostRecentYearBP":-32,"mostRecentYearCE":1982,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/21550","originalSource":null,"publication":[{"abstract":"Delineating the controls on hydroclimate throughout Brazil is essential to assessing potential impact of global climate change on water resources and biogeography. An increasing number of monsoon reconstructions from d18O records provide insight into variations in regional monsoon intensity over the last millennium. The strength, however, of d18O as a proxy of regional climate limits its ability to reflect local conditions, highlighting the need for comparable reconstructions of local moisture conditions. Here, speleothem 87Sr/86Sr values are developed as a paleo-moisture proxy in central Brazil to complement existing d18O-based reconstructions of regional monsoon intensity. Speleothem 87Sr/86Sr values are resolved using laser ablation and conventional solution mass spectrometry at high resolution relative to existing (non-d18O-based) paleo-moisture reconstructions to allow comparisons of centennial variability in paleo-monsoon intensity and paleo-moisture conditions. Variations in speleothem 87Sr/86Sr values from Tamboril Cave are interpreted to reflect varying extents of water interaction with the carbonate host rock, with more interaction resulting in greater evolution of water isotope values from those initially acquired from the soil to those of the carbonate bedrock. Increasing speleothem 87Sr/86Sr values over the last millennium suggest progressively less interaction with the carbonate host rock likely resulting from higher infiltration rates, expected under wetter conditions. Increasingly wetter conditions over the last millennium are consistent with an overall trend of increasing monsoon intensity (decreasing d18O values) preserved in many existing d18O records from the region. Such a trend, however, is absent in d18O records from our site (central Brazil) and Cristal Cave (southeast Brazil), suggesting the existence of divergent (relevant to d18Oprecip) shifts in the climate patterns within and outside the core monsoon region.","author":{"name":"Barbara E. Wortham, Corinne I. Wong, Lucas C.R. Silva, David McGee, Isabel P. Montanez, E. Troy Rasbury, Kari M. Cooper, Warren D. Sharp, Justin J.G. Glessner, Roberto V. Santos"},"citation":"Barbara E. Wortham, Corinne I. Wong, Lucas C.R. Silva, David McGee, Isabel P. Montanez, E. Troy Rasbury, Kari M. Cooper, Warren D. Sharp, Justin J.G. Glessner, Roberto V. Santos. 2017. Assessing response of local moisture conditions in central Brazil to variability in regional monsoon intensity using speleothem 87Sr/86Sr values. Earth and Planetary Science Letters, 463. doi: 10.1016/j.epsl.2017.01.034","edition":null,"identifier":{"id":"10.1016/j.epsl.2017.01.034","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2017.01.034"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":null,"pubRank":"1","pubYear":2017,"reportNumber":null,"title":"Assessing response of local moisture conditions in central Brazil to variability in regional monsoon intensity using speleothem 87Sr/86Sr values","type":"publication","volume":"463"}],"reconstruction":"N","scienceKeywords":["Monsoon"],"site":[{"NOAASiteId":"57045","geo":{"geoType":"Feature","geometry":{"coordinates":["-16.364","-46.904"],"type":"POINT"},"properties":{"easternmostLongitude":"-46.904","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"-16.364","southernmostLatitude":"-16.364","westernmostLongitude":"-46.904"}},"locationName":"Continent>South America>Brazil>Minas Gerais","mappable":"Y","paleoData":[{"NOAADataTableId":"32444","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>speleothems>carbon isotopes","earth science>paleoclimate>speleothems>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/tamboril2017d18o.txt","linkText":"Tamboril Cave d18O and d13C","urlDescription":"Formatted Text Data File","variables":[{"cvAdditionalInfo":"depth from top","cvDataType":"SPELEOTHEMS","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"millimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"SPELEOTHEMS","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":"SPELEOTHEMS","cvDetail":"raw","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate>calcium carbonate","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":null,"cvDataType":"SPELEOTHEMS","cvDetail":"raw","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate>calcium carbonate","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VPDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"Tamboril2017d18O","dataTableNotes":null,"earliestYear":1677,"earliestYearBP":1677,"earliestYearCE":273,"mostRecentYear":-32,"mostRecentYearBP":-32,"mostRecentYearCE":1982,"species":[],"timeUnit":"cal yr BP"},{"NOAADataTableId":"32445","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>speleothems>other"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/tamboril2017sr.txt","linkText":"Tamboril Cave 87Sr/86Sr","urlDescription":"Formatted Text Data File","variables":[{"cvAdditionalInfo":"laboratory name","cvDataType":"SPELEOTHEMS","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"depth from top","cvDataType":"SPELEOTHEMS","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"millimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"SPELEOTHEMS","cvDetail":"raw","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate>calcium carbonate","cvMethod":"multiple collector inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>isotope>isotope ratio>87Sr/86Sr"},{"cvAdditionalInfo":null,"cvDataType":"SPELEOTHEMS","cvDetail":"raw","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>identified mineral>carbonate>calcium carbonate","cvMethod":"thermal ionization mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>isotope>isotope ratio>87Sr/86Sr"}]}],"dataTableName":"Tamboril2017Sr","dataTableNotes":null,"earliestYear":2000,"earliestYearBP":2000,"earliestYearCE":-50,"mostRecentYear":-32,"mostRecentYearBP":-32,"mostRecentYearCE":1982,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Tamboril Cave"}],"studyCode":null,"studyName":"Tamboril Cave, Brazil 2000 Year Strontium and Oxygen Isotope Data","studyNotes":"Oxygen (d18O), Carbon (d13C), and Strontium (87Sr/86Sr) isotope data from speleothems collected in Tamboril Cave, central Brazil, for the past 2,000  years.","version":"1.0","xmlId":"19548"}