noaa-cave-23790 Tangga Cave, Sumatra 16,000 Year Speleothem Oxygen Isotope Data Wurtzel, J.B.; Abram, N.J.; Lewis, S.C.; Bajo, P.; Hellstrom, J.C.; Troitzsch, U.; Heslop, D. Tangga Cave, Sumatra 16,000 Year Speleothem Oxygen Isotope Data 2018-04-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23790 Investigator J.B. Wurtzel Investigator N.J. Abram Investigator S.C. Lewis Investigator P. Bajo Investigator J.C. Hellstrom Investigator U. Troitzsch Investigator D. Heslop earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,null earth science paleoclimate speleothems calcite,null,null,fraction,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,ice volume corrected aragonite equivalent earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,null,isotope ratio mass spectrometry,N,aragonite and calcite earth science paleoclimate speleothems age,null,null,calendar kiloyear before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,null,isotope ratio mass spectrometry,N,aragonite equivalent earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 16571 cal yr BP 159 cal yr BP Complete -.36 -.36 100.76 100.76 600 600 Ocean Indian Ocean Indonesia Sumatra Tangga Cave>LATITUDE -.36>LONGITUDE 100.76 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Jennifer B. Wurtzel, Nerilie J. Abram, Sophie C. Lewis, Petra Bajo, John C. Hellstrom, Ulrike Troitzsch, David Heslop 2018 Earth and Planetary Science Letters 492 264-278 10.1016/j.epsl.2018.04.001 https://www.sciencedirect.com/science/article/pii/S0012821X18301961

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. Here 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. STUDY NOTES: Oxygen isotope data (raw and corrected) and age model from sample TA12-2 of Tangga Cave in West Sumatra, Sumatra, Indonesia

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/tangga2018d18o.txt NOAA Template File; Tangga Cave d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11