{"NOAAStudyId":"23790","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":"2018-04-25","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-23790.xml","doi":null,"earliestYearBP":16571,"earliestYearCE":-14621,"entryId":"noaa-cave-23790","funding":[{"fundingAgency":"Australian Research Council  ","fundingGrant":"DP110101161, DP140102059"}],"investigators":"Wurtzel, J.B.; Abram, N.J.; Lewis, S.C.; Bajo, P.; Hellstrom, J.C.; Troitzsch, U.; Heslop, D.","mostRecentYearBP":159,"mostRecentYearCE":1791,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/23790","originalSource":null,"publication":[{"abstract":"Abrupt changes in Atlantic Meridional Overturning Circulation are known to have affected the strength of the Indian and Asian Monsoons during glacial and deglacial climate states. However, there is still much uncertainty around the hydroclimate response of the Indo-Pacific Warm Pool (IPWP) region to abrupt climate changes in the North Atlantic. Many studies suggest a mean southward shift in the intertropical convergence zone (ITCZ) in the IPWP region during phases of reduced Atlantic meridional overturning, however, existing proxies have seasonal biases and conflicting responses, making it difficult to determine the true extent of North Atlantic forcing in this climatically important region.\r\n\r\nHere we present a precisely-dated, high-resolution record of eastern Indian Ocean hydroclimate variability spanning the last 16 ky (thousand years) from d18O measurements in an aragonite-calcite speleothem from central Sumatra. This represents the western-most speleothem record from the IPWP region. Precipitation arrives year-round at this site, with the majority sourced from the local tropical eastern Indian Ocean and two additional long-range seasonal sources associated with the boreal and austral summer monsoons. The Sumatran speleothem demonstrates a clear deglacial structure that includes 18O enrichment during the Younger Dryas and 18O depletion during the Bolling-Allerød, similar to the pattern seen in speleothems of the Asian and Indian monsoon realms. The speleothem d18O changes at this site are best explained by changes in rainfall amount and changes in the contributions from different moisture pathways. Reduced rainfall in Sumatra during the Younger Dryas is most likely driven by reductions in moisture transport along the northern or southern monsoon transport pathways to Sumatra. Considered with other regional proxies, the record from Sumatra suggests the response of the IPWP to North Atlantic freshwater forcing is not solely driven by southward shifts of the ITCZ, but also a reduction in moisture transport along both monsoon pathways.","author":{"name":"Jennifer B. Wurtzel, Nerilie J. Abram, Sophie C. Lewis, Petra Bajo, John C. Hellstrom, Ulrike Troitzsch, David Heslop"},"citation":"Jennifer B. Wurtzel, Nerilie J. Abram, Sophie C. Lewis, Petra Bajo, John C. Hellstrom, Ulrike Troitzsch, David Heslop. 2018. Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia. Earth and Planetary Science Letters, 492, 264-278. doi: 10.1016/j.epsl.2018.04.001","edition":null,"identifier":{"id":"10.1016/j.epsl.2018.04.001","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2018.04.001"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"264-278","pubRank":"1","pubYear":2018,"reportNumber":null,"title":"Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia","type":"publication","volume":"492"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57625","geo":{"geoType":"Feature","geometry":{"coordinates":["-.36","100.76"],"type":"POINT"},"properties":{"easternmostLongitude":"100.76","maxElevationMeters":"600","minElevationMeters":"600","northernmostLatitude":"-0.36","southernmostLatitude":"-0.36","westernmostLongitude":"100.76"}},"locationName":"Ocean>Indian Ocean>Indonesia>Sumatra","mappable":"Y","paleoData":[{"NOAADataTableId":"35637","coreLengthMeters":0,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>speleothems>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/tangga2018d18o.txt","linkText":"Tangga Cave d18O Data","urlDescription":"NOAA Template File","variables":[{"cvAdditionalInfo":null,"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 kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":"aragonite and calcite","cvDataType":"SPELEOTHEMS","cvDetail":null,"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"},{"cvAdditionalInfo":null,"cvDataType":"SPELEOTHEMS","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"fraction","cvWhat":"geological material>identified mineral>carbonate>calcium carbonate>calcite"},{"cvAdditionalInfo":"aragonite equivalent","cvDataType":"SPELEOTHEMS","cvDetail":null,"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"},{"cvAdditionalInfo":"ice volume corrected aragonite equivalent","cvDataType":"SPELEOTHEMS","cvDetail":"corrected","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":"Tangge2018TA12-2d18O","dataTableNotes":null,"earliestYear":16571,"earliestYearBP":16571,"earliestYearCE":-14621,"mostRecentYear":159,"mostRecentYearBP":159,"mostRecentYearCE":1791,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Tangga Cave"}],"studyCode":null,"studyName":"Tangga Cave, Sumatra 16,000 Year Speleothem Oxygen Isotope Data","studyNotes":"Oxygen isotope data (raw and corrected) and age model from sample TA12-2 of Tangga Cave in West Sumatra, Sumatra, Indonesia","version":"1.0","xmlId":"21954"}