noaa-coral-23390 Cocos (Keeling) Islands Coral Sr/Ca and Oxygen Isotope Data over the Last 200 Years Hennekam, R.; Zinke, J. Cocos (Keeling) Islands Coral Sr/Ca and Oxygen Isotope Data over the Last 200 Years 2018-02-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23390 Investigator R. Hennekam Investigator J. Zinke 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 oxygen isotopes earth science paleoclimate corals and sclerosponges trace metals geoscientificInformation Other Reconstruction 1808 AD 2009 AD 142 cal yr BP -59 cal yr BP Complete -12.09503 -12.08747 96.87522 96.8805 Ocean Indian Ocean Cocos Islands Darwin D3, Cocos (Keeling) Islands>LATITUDE -12.09503>LONGITUDE 96.8805 Ocean Indian Ocean Cocos Islands Darwin Long DL, Cocos (Keeling) Islands>LATITUDE -12.08747>LONGITUDE 96.87522 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Hennekam, R., Zinke, J., van Sebille, E., ten Have, M., Brummer, G.-J.A., and Reichart, G.-J. 2018 Paleoceanography and Paleoclimatology 33 10.1002/2017PA003181

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)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-srca.txt NOAA Template File; Darwin Long (DL) Sr/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-d18o.txt NOAA Template File; Darwin (D3) d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-d3-srca.txt NOAA Template File; Darwin (D3) Sr/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/hennekam2018/hennekam2018-dl-d18o.txt NOAA Template File; Darwin Long (DL) d18O Data USA/NOAA DIF Version 9.8.4 2019-06-17 2019-06-17