South China Sea 350KYr Radiometric Marine Chronology Caballero-Gill, R.P.; Clemens, S.C.; Prell, W.L. Caballero-Gill, R.P. Clemens, S.C. Prell, W.L. earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,212-355 mm) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,10 percent residuals) earth science/paleoclimate/paleoceanography (delta 13C,Uvigerina peregrina,null,per mil VPDB,null,paleoceanography,null,null,N,212-355 mm) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,212-355 mm) earth science/paleoclimate/paleoceanography (delta 18O,Uvigerina peregrina,null,per mil VPDB,null,paleoceanography,null,null,N,212-355 mm) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,normalized,null,N,11 percent residuals) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,mbsf) earth science/paleoclimate/paleocean (ODP1146>LATITUDE 19.45>LONGITUDE 116.27) Orbital tuning of benthic d18O is a common approach for assigning ages to ocean sediment records. Similar environmental forcing of the northern South China Sea and the southeast Asian cave regions allows for transfer of the speleothem d18O radiometric chronology to the planktonic and benthic d18O records from Ocean Drilling Program Site 1146, yielding a new chronology with 41 radiometrically calibrated datums, spanning the past 350 kyr. This approach also provides for an independent assessment of the accuracy of the orbitally tuned benthic d18O chronology for the last 350 kyr. The largest differences relative to the latest chronology occur in marine isotope stages (MIS) 5.4, 5.5, 6, 7, and 9.3. Prominent suborbital-scale structure believed to be global in nature is identified within MIS 5.4 and MIS 7.2. On the basis of the radiometrically calibrated chronology, the time constant of the ice sheet is found to be 5.4 kyr at the precession band (light d18O lags precession minima by -55.4°) and 10.4 kyr at the obliquity band (light d18O lags obliquity maxima by 57.4°). These values are significantly shorter than the single 17 kyr time constant originally estimated by Imbrie et al. (1984), based primarily on the timing of terminations I and II and the 15 kyr time constant used by Lisiecki and Raymo (2005). STUDY NOTES: Foraminiferal stable isotope data (d18O and d13C) from core ODP1146 in the South China Sea for the last 350 KYrBP. These data are used to produce a radiometrically-calibrated chronology for ocean sediments, derived from radiometrically-dated speleothem records from southeast Asia. Ocean Drilling Program Site 1146: 19°27'N, 116°16'E, 2092m depth NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Caballero-Gill, R.P. Investigator : Clemens, S.C. Investigator : Prell, W.L. 2012-04-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/12901 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.xls English https://www.ncdc.noaa.gov/paleo/study/12901 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/caballero-gill2012b/caballero-gill2012b.xls Caballero-Gill, R.P., S.C. Clemens, and W.L. Prell. 2012. Direct correlation of Chinese speleothem d18O and South China Sea planktonic d18O: Transferring a speleothem chronology to the benthic marine chronology. Paleoceanography, 27, PA2203, doi:10.1029/2011PA002268 START YEAR: 351509 cal yr BP * END YEAR: 352 cal yr BP 116.27 19.45 116.27 19.45