Cocos (Keeling) Islands Coral Sr/Ca and Oxygen Isotope Data over the Last 200 Years Hennekam, R.; Zinke, J. Hennekam, R. Zinke, J. Other Reconstruction earth science/paleoclimate/climate reconstructions|corals and sclerosponges (delta 18O,delta 18O|sea water|strontium/calcium,null,per mil VSMOW,null,climate reconstructions|corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (strontium/calcium,Porites sp.,null,millimole per mole,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (strontium/calcium,Porites sp.,null,millimole per mole,null,corals and sclerosponges,null,null,N,~bimonthly) earth science/paleoclimate/climate reconstructions|corals and sclerosponges (age,null,null,year Common Era,null,climate reconstructions|corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (delta 18O,Porites sp.,null,per mil,null,corals and sclerosponges,null,isotope ratio mass spectrometry,N,~bimonthly; KIEL and IR-MS) earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges (Darwin D3, Cocos (Keeling) Islands>LATITUDE -12.09503>LONGITUDE 96.8805) (Darwin Long DL, Cocos (Keeling) Islands>LATITUDE -12.08747>LONGITUDE 96.87522) The only low latitude pathway of heat and salt from the Pacific Ocean to the Indian Ocean, known as Indonesian Throughflow (ITF), has been suggested to modulate Global Mean Surface Temperature (GMST) warming through redistribution of surface Pacific Ocean heat. ITF observations are only available since ~1990s, and thus, its multidecadal variability on longer time scales has remained elusive. Here we present a 200 year bimonthly record of geochemical parameters (d18O-Sr/Ca) measured on Cocos (Keeling) corals tracking sea surface temperature (SST; Sr/Ca) and sea surface salinity (SSS; seawater-d18O-d18Osw) in the southeastern tropical Indian Ocean (SETIO). Our results show that SETIO SSS and d18Osw were impacted by ITF transport over the past 60 years, and therefore, reconstructions of Cocos d18Osw hold information on past ITF variability on longer time spans. Over the past 200 years ITF leakage into SETIO is dominated by the interannual climate modes of the Pacific Ocean (El Niño-Southern Oscillation) and Indian Ocean (Indian Ocean Dipole). Pacific decadal climate variability (represented by the Pacific Decadal Oscillation) significantly impacted ITF strength over the past 200 years determining the spatiotemporal SST and SSS advection into the Indian Ocean on multidecadal time scales. A comparison of our SETIO d18Osw record to GMST shows that ITF transport varied in synchrony with global warming rate, being predominantly high/low during GMST warming slowdown/acceleration, respectively. This hints toward an important role for the ITF in global warming rate modulation. STUDY NOTES: Chronology based on seasonal cycles in trace elements (Sr/Ca). Updated data tables from investigators added on 7-JUN-2019. Bimonthly data submitted to replace monthly interpolation data on 17-JUN-2019. Provided Keywords: corals, Sr/Ca, SST, Indonesian Throughflow, Cocos (Keeling) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hennekam, R. Investigator : Zinke, J. 2018-02-12 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23390 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-d18o.txt English https://www.ncdc.noaa.gov/paleo/study/23390 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-srca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-d18o.txt Hennekam, R., Zinke, J., van Sebille, E., ten Have, M., Brummer, G.-J.A., and Reichart, G.-J.2018Cocos (Keeling) corals reveal 200 years of multi-decadal modulation of southeast Indian Ocean hydrology by Indonesian ThroughflowPaleoceanography and Paleoclimatology3310.1002/2017PA003181 START YEAR: 1808 AD * END YEAR: 2009 AD 96.87522 -12.09503 96.8805 -12.08747