Indo-Pacific Warm Pool 35KYr Foraminiferal d18Oseawater Estimates Gibbons, F.T.; Oppo, D.W.; Mohtadi, M.; Rosenthal, Y.; Cheng, J.; Liu, Z.; Linsley, B.K. Gibbons, F.T. Oppo, D.W. Mohtadi, M. Rosenthal, Y. Cheng, J. Liu, Z. Linsley, B.K. Heinrich Events Meridional Overturning Circulation (MOC) Warm Pool hydrology earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,using G. ruber) earth science/paleoclimate/climate reconstructions|paleoceanography (principal component,null,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,axis 2; regional average of ice volume corrected del18Oseawater) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,corrected,null,N,using G. ruber; ice volume corrected) earth science/paleoclimate/climate reconstructions|paleoceanography (principal component,null,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,axis 3; regional average of ice volume corrected del18Oseawater) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (principal component,null,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,axis 1; regional average of ice volume corrected del18Oseawater) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,using G. ruber) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,averaged|corrected,null,N,regional average of ice volume corrected del18Oseawater) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (GeoB10069-3>LATITUDE -9.594833>LONGITUDE 120.917) Evidence from geologic archives suggests that there were large changes in the tropical hydrologic cycle associated with the two prominent northern hemisphere deglacial cooling events, Heinrich Stadial 1 (HS1; ~19 to 15 kyr BP; kyr BP = 1000 yr before present) and the Younger Dryas (~12.9 to 11.7 kyr BP). These hydrologic shifts have been alternatively attributed to high and low latitude origin. Here, we present a new record of hydrologic variability based on planktic foraminifera-derived d18O of seawater (d18Osw) estimates from a sediment core from the tropical Eastern Indian Ocean, and using 12 additional d18Osw records, construct a single record of the dominant mode of tropical Eastern Equatorial Pacific and Indo-Pacific Warm Pool (IPWP) hydrologic variability. We show that deglacial hydrologic shifts parallel variations in the reconstructed interhemispheric temperature gradient, suggesting a strong response to variations in the Atlantic Meridional Overturning Circulation and the attendant heat redistribution. A transient model simulation of the last deglaciation suggests that hydrologic changes, including a southward shift in the Intertropical Convergence Zone (ITCZ) which likely occurred during these northern hemisphere cold events, coupled with oceanic advection and mixing, resulted in increased salinity in the Indonesian region of the IPWP and the eastern tropical Pacific, which is recorded by the d18Osw proxy. Based on our observations and modeling results we suggest the interhemispheric temperature gradient directly controls the tropical hydrologic cycle on these time scales, which in turn mediates poleward atmospheric heat transport. STUDY NOTES: Planktic foraminiferal Mg/Ca and oxygen isotope (d18O) data, plus estimated d18Oseawater and ice volume corrected del18Oseawater for the past 35,000 years from sediment core GeoB10069-3, collected in the tropical Eastern Indian Ocean. All data are from G. ruber. Also included is a regional average of ice volume corrected del18Oseawater and a principal component analysis of this dataset. For a list of cores included in the average and principal component analysis, see file gibbons2014pc.txt. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Gibbons, F.T. Investigator : Oppo, D.W. Investigator : Mohtadi, M. Investigator : Rosenthal, Y. Investigator : Cheng, J. Investigator : Liu, Z. Investigator : Linsley, B.K. 2014-03-16 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16155 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014d18o-sw.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014d18o-sw.txt English https://www.ncdc.noaa.gov/paleo/study/16155 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gibbons2014/gibbons2014d18o-sw.txt Fern T. Gibbons, Delia W. Oppo, Mahyar Mohtadi, Yair Rosenthal, Jun Cheng, Zhengyu Liu, Braddock K. Linsley2014Deglacial d18O and hydrologic variability in the tropical Pacific and Indian OceansEarth and Planetary Science Letters387240-25110.1016/j.epsl.2013.11.032http://www.sciencedirect.com/science/article/pii/S0012821X13006663 START YEAR: 35240 cal yr BP * END YEAR: 250 cal yr BP 120.917 -9.594833 120.917 -9.594833