Palawan, Philippines Younger Dryas Speleothem Oxygen Isotope Data Partin, J.W.; Quinn, T.M.; Shen, C.-C.; Okumura, Y.; Cardenas, M.B.; Siringan, F.P.; Banner, J.L.; Lin, K.; Hu, H.-M.; Taylor, F.W. Partin, J.W. Quinn, T.M. Shen, C.-C. Okumura, Y. Cardenas, M.B. Siringan, F.P. Banner, J.L. Lin, K. Hu, H.-M. Taylor, F.W. earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (age,null,95% confidence interval margin of error,calendar year,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 (Puerto Princesa Subterranean River National Park>LATITUDE 10.2>LONGITUDE 118.9) Proxy records of temperature from the Atlantic clearly show that the Younger Dryas was an abrupt climate change event during the last deglaciation, but records of hydroclimate are underutilized in defining the event. Here we combine a new hydroclimate record from Palawan, Philippines, in the tropical Pacific, with previously published records to highlight a difference between hydroclimate and temperature responses to the Younger Dryas. Although the onset and termination are synchronous across the records, tropical hydroclimate changes are more gradual (>100 years) than the abrupt (10-100 years) temperature changes in the northern Atlantic Ocean. The abrupt recovery of Greenland temperatures likely reflects changes in regional sea ice extent. Proxy data and transient climate model simulations support the hypothesis that freshwater forced a reduction in the Atlantic meridional overturning circulation, thereby causing the Younger Dryas. However, changes in ocean overturning may not produce the same effects globally as in Greenland. STUDY NOTES: Stalagmite oxygen isotope (d18O) data from the Puerto Princesa Subterranean River National Park, Palawan, Philippines, for 13,700 to 10,700 years before present, bracketing the Younger Dryas climate event. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Partin, J.W. Investigator : Quinn, T.M. Investigator : Shen, C.-C. Investigator : Okumura, Y. Investigator : Cardenas, M.B. Investigator : Siringan, F.P. Investigator : Banner, J.L. Investigator : Lin, K. Investigator : Hu, H.-M. Investigator : Taylor, F.W. 2015-09-03 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19199 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/palawan2015d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/palawan2015d18o.txt English https://www.ncdc.noaa.gov/paleo/study/19199 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/pacific/palawan2015d18o.txt Partin, J.W.; Quinn, T.M.; Shen, C.-C.; Okumura, Y.; Cardenas, M.B.; Siringan, F.P.; Banner, J.L.; Lin, K.; Hu, H.-M.; Taylor, F.W.2015Gradual Onset and Recovery of the Younger Dryas Abrupt Climate Event in the TropicsNature Communications10.1038/ncomms9061http://www.nature.com/ncomms/2015/150902/ncomms9061/full/ncomms9061.html START YEAR: 13711 cal yr BP * END YEAR: 10784 cal yr BP 118.9 10.2 118.9 10.2