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. Wurtzel, J.B. Abram, N.J. Lewis, S.C. Bajo, P. Hellstrom, J.C. Troitzsch, U. Heslop, D. 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 (Tangga Cave>LATITUDE -.36>LONGITUDE 100.76) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wurtzel, J.B. Investigator : Abram, N.J. Investigator : Lewis, S.C. Investigator : Bajo, P. Investigator : Hellstrom, J.C. Investigator : Troitzsch, U. Investigator : Heslop, D. 2018-04-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23790 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/tangga2018d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/tangga2018d18o.txt English https://www.ncdc.noaa.gov/paleo/study/23790 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/tangga2018d18o.txt Jennifer B. Wurtzel, Nerilie J. Abram, Sophie C. Lewis, Petra Bajo, John C. Hellstrom, Ulrike Troitzsch, David Heslop2018Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, IndonesiaEarth and Planetary Science Letters492264-27810.1016/j.epsl.2018.04.001https://www.sciencedirect.com/science/article/pii/S0012821X18301961 START YEAR: 16571 cal yr BP * END YEAR: 159 cal yr BP 100.76 -.36 100.76 -.36