https://doi.pangaea.de/10.1594/PANGAEA.993402Hess, Anya VAnya VHess0000-0001-9272-2534Woods Hole Oceanographic InstitutionGeorge Mason UniversityWang, ShouyiShouyiWang0000-0002-9046-6474Woods Hole Oceanographic InstitutionUniversity of Colorado, BoulderUmmenhofer, Caroline CCaroline CUmmenhoferWoods Hole Oceanographic InstitutionRosenthal, YairYairRosenthal0000-0002-7546-6011The State University of New JerseyOppo, Delia WDelia WOppo0000-0003-2946-5904Woods Hole Oceanographic InstitutionLast millennium thermocline temperature reconstructions from the Indonesian Throughflow based on planktonic foraminifera (Pulleniatina obliquiloculata) Mg/CaPANGAEA2026ForaminiferaIndonesian ThroughflowLittle Ice Agemedieval climate anomalyMg/CaMg/Ca planktonic foraminiferaPacific Water CirculationPulleniatina obliquiloculataThermoclinethermocline depththermocline water temperatureEvent labelOther eventCampaignDATE/TIMELATITUDELONGITUDEELEVATIONDevice typeSiteDEPTH, sediment/rockSpeciesSize fractionCleaning methodQuality controlMagnesium/Calcium ratioAge, medianThermocline water temperatureAluminium/Calcium ratioTitanium/Calcium ratioManganese/Calcium ratioIron/Calcium ratioReference/sourceMultiCorerGravity corer2003-07-01T00:00:00Dataset10.1029/2002PA00084610.1002/2017PA00312210.5194/gchron-3-149-202110.1029/2006GL02723410.1038/nature0823310.1126/science.aac993710.1002/2014GL0614505792 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalData access is restricted (moratorium, sensitive data, license constraints)This data accompanies Hess et al. (2026, Science Advances). It consists of Last Millennium (750 CE to present) Mg/Ca and other trace elemental measurements from a thermocline-dwelling planktonic foraminifera (Pulleniatina obliquiloculata) from the Indonesian Seas. Sediment cores BJ8-03 31MC and BJ8-03 32GGC are from the Makassar Strait and BJ8-03 6MC and BJ8-03 7GGC from the Java Sea. Mg/Ca values from Site BJ8-03 31MC have been corrected for analytical offsets from BJ8-03 32GGC. Hess et al. (2026) used temperatures derived using the species-specific calibrations of Hollstein et al. (2017), though those derived using the multi-species equation from Anand et al. (2003) are also provided. Ages were generated using geoChronR (McKay et al., 2021).115.3531119.453967-7.47765-3.88325West Sulawesi marginNational Science Foundationhttps://doi.org/10.13039/100000001OCE-2303513