Makassar Strait 14KYr Foraminiferal Mg/Ca SST and d18Osw Linsley, B.K.; Rosenthal, Y.; Oppo, D.W. Linsley, B.K. Rosenthal, Y. Oppo, D.W. Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction Warm Pool earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Globigerinoides ruber) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil,null,climate reconstructions|paleoceanography,null,null,N,Globigerinoides ruber) earth science/paleoclimate/climate reconstructions|paleoceanography (number of samples,null,null,count,null,climate reconstructions|paleoceanography,null,null,N,number of samples per bin) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,one standard error,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,anomalized from the average of the last 2000y; 8 core composite binned into 200 year intervals) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,anomalized from the average of the last 2000y) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,anomalized from the average of the last 2000y; 8 core composite binned into 200 year intervals) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,one standard error lower bound,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,anomalized from the average of the last 2000y; 8 core composite binned into 200 year intervals) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil,null,paleoceanography,null,null,N,212-250 mcm fraction) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,Mg25/Ca43) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,one standard error upper bound,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,anomalized from the average of the last 2000y; 8 core composite binned into 200 year intervals) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (13GGC>LATITUDE -7.4>LONGITUDE 115.2) (10GGC>LATITUDE -7.3667>LONGITUDE 115.25) (70GGC>LATITUDE -3.5667>LONGITUDE 119.3833) High sea surface temperatures in the western Pacific warm pool fuel atmospheric convection and influence tropical climate. This region also hosts the Indonesian throughflow, the network of currents through which surface and thermocline waters are transported from the western equatorial Pacific Ocean into the Indian Ocean. Here we show, using records of the d18O and Mg/Ca of planktonic foraminifera from eight sediment cores, that from about 10,000 to 7,000 years ago, sea surface temperatures in the western sector of the western Pacific warm pool were about 0.5°C higher than during pre-industrial times. We also find that about 9,500 years ago, when the South China and Indonesian seas were connected by rising sea level, surface waters in the Makassar Strait became relatively fresher. We suggest that the permanent reduction of surface salinity initiated the enhanced flow at lower, thermocline depths seen in the modern Indonesian throughflow. However, the uniformly warm sea surface temperatures found upstream and downstream of the Indonesian throughflow indicate that the early Holocene warmth in this region was not directly related to reduced heat transport by the throughflow that may have resulted from surface freshening of the Makassar Strait. Instead, we propose that the elevated temperatures were the result of a westward shift or expansion of the boundaries of the western Pacific warm pool. STUDY NOTES: Planktonic foraminiferal Mg/Ca records of mixed-layer temperatures in the western Pacific warm pool. Included are new Globigerinoides ruber Mg/Ca data from the southern Makassar Strait, cores 13GGC, 70GGC and 10GGC, and regional average composite sediment core SST and d18Osw reconstructions utilizing these and previously published data. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Linsley, B.K. Investigator : Rosenthal, Y. Investigator : Oppo, D.W. 2010-08-02 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10420 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.txt English https://www.ncdc.noaa.gov/paleo/study/10420 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/linsley2010/linsley2010.txt Linsley, B.K., Y. Rosenthal, and D.W. Oppo. 2010. Holocene evolution of the Indonesian throughflow and the western Pacific warm pool. Nature Geoscience, Vol. 3, pp. 578-583, August 2010. DOI: 10.1038/NGEO920 START YEAR: 14300 cal yr BP * END YEAR: 107 cal yr BP 115.2 -7.4 119.3833 -3.5667