Ball Gown Cave, tropical Western Australia, stable isotope delta 18O data Denniston, R.F.; Wyrwoll, K-H.; Asmerom, Y.; Polyak, V.J.; Humphreys, W.F.; Cugley, J.; Woods, D.; Peota, J.; Greaves, E. Denniston, R.F. Wyrwoll, K-H. Asmerom, Y. Polyak, V.J. Humphreys, W.F. Cugley, J. Woods, D. Peota, J. Greaves, E. Dansgaard-Oeschger cycles Last Glacial Maximum Monsoon Younger Dryas earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Ball Gown Cave>LATITUDE -17.333333>LONGITUDE 124.083333) Recent studies of the Last Glacial period Indo-Australian summer monsoon (IASM) have revealed links to both northern and southern hemisphere high latitude climate as well as to regional ocean conditions. Particular interest has been paid to the monsoon response to Heinrich events, with variability explained by meridional shifts in positioning of the intertropical convergence zone (ITCZ), but this model has not been adequately tested. In addition, the shorter-lived Dansgaard/Oeschger (D/O) events have not been detected (beyond D/O-1, the Bølling/Allerød) in land-based records from the Indo-Pacific, despite their prominent expression in stalagmites from southern Asia, raising questions about the sensitivity of the IASM to these events. Here we present a Southern Hemisphere stalagmite oxygen isotopic time series from Ball Gown Cave (BGC), tropical northern Australia, located on the margins of the modern austral summer ITCZ, that spans 40e31 and 27e8 ka. Elevated IASM rainfall coincides with Heinrich stadials and the Younger Dryas, while decreased rainfall characterizes D/O interstadials, a response that is antiphased with sites spanning the Indo-Pacific Warm Pool and with Chinese records of the East Asian summer monsoon. The BGC time series thus reveals a precipitation dipole consistent with a southward northward) migration of the ITCZ during periods of high northern latitude cooling (warming) as the primary driver of millennial-scale IASM variability during the Last Glacial period. Our record indicates a strengthening of the IASM after the Younger Dryas period, likely as a result of rising sea level and sea surface temperatures, breaking the link with the high latitudes. STUDY NOTES: A discontinuous, U-Th-dated, stalagmite oxygen isotopic time series from six stalagmites from Ball Gown Cave, tropical Western Australia. These data are interpreted as tracking Last Glacial through early Holocene variability in the Indo-Australian summer monsoon. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Denniston, R.F. Investigator : Wyrwoll, K-H. Investigator : Asmerom, Y. Investigator : Polyak, V.J. Investigator : Humphreys, W.F. Investigator : Cugley, J. Investigator : Woods, D. Investigator : Peota, J. Investigator : Greaves, E. 2013-06-17 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14648 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg11.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg16.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg11.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg16.txt English https://www.ncdc.noaa.gov/paleo/study/14648 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg11.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/australia/ballgowncave2013wg16.txt Denniston, R.F., Wyrwoll, K-H., Asmerom, Y., Polyak, V.J., Humphreys, W., Cugley, J., Woods, D., Peota, J., and Greaves, E. (2013) North Atlantic Forcing of Millennial-Scale Australian Monsoon Variability during the Late Glacial. Quaternary Science Reviews 72, 159-168, http://dx.doi.org/10.1016/j.quascirev.2013.04.012. START YEAR: 40174 cal yr BP * END YEAR: 8367 cal yr BP 124.083333 -17.333333 124.083333 -17.333333