Palau Lake Sediment 800 Year Dinosterol Hydrogen Isotope Data Richey, J.N.; Sachs, J.P. Richey, J.N. Sachs, J.P. ENSO Intertropical Convergence Zone (ITCZ) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,range upper bound,year Common Era,null,paleolimnology,null,null,N,modeled maximum age) earth science/paleoclimate/paleolimnology (delta 2H,dinosterol,one standard deviation,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (age,null,range lower bound,year Common Era,null,paleolimnology,null,null,N,modeled minimum age) earth science/paleoclimate/paleolimnology (delta 2H,dinosterol,null,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (Clear Lake Palau>LATITUDE 7.1525>LONGITUDE 134.3594) Modern seasonal and inter-annual precipitation variability in Palau is linked to both meridional movement of the Intertropical Convergence Zone (ITCZ) and changes in the Pacific Walker Circulation (PWC) associated with the El Nino-Southern Oscillation. Thus, Palau's hydroclimate should be sensitive to mean shifts in the ITCZ and PWC on decadal to centennial time scales. Using compound-specific hydrogen isotope ratios (d2H) of dinosterol in lake sediments, we generated a decadal-resolution proxy record of hydroclimatic variability in Palau spanning the past 800 yr. Results indicate a drying trend during the Little Ice Age in Palau, consistent with a southward displacement of the ITCZ. In addition to the secular drying trend, there are persistent large (~20 per mil) multi-decadal to centennial oscillations in the d2H record, the most recent of which indicates an abrupt shift to drier conditions in the mid-1970s that coincides with a decadal-scale negative shift in the Southern Oscillation Index. STUDY NOTES: Hydrogen isotope (d2H) data on dinosterol from sediment core CL2-MW1 collected in Clear Lake, Palau, for the past 800 years NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Richey, J.N. Investigator : Sachs, J.P. 2016-09-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20517 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/pacific/palau2016d2h.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/pacific/palau2016d2h.txt English https://www.ncdc.noaa.gov/paleo/study/20517 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/pacific/palau2016d2h.txt J.N. Richey and J.P. Sach2016Precipitation changes in the western tropical Pacific over the past millenniumGeology448671-68410.1130/G37822.1http://geology.gsapubs.org/content/44/8/671.abstract START YEAR: 1284 AD * END YEAR: 2002 AD 134.3594 7.1525 134.3594 7.1525