Caribbean Foraminiferal Mg/Ca, d18OCalcite, and Paleosalinity Schmidt, M.W.; Spero, H.J.; Lea, D.W. Schmidt, M.W. Spero, H.J. Lea, D.W. Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil PDB,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber white,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 999A>LATITUDE 12.75>LONGITUDE -78.73) (VM28-22>LATITUDE 11.57>LONGITUDE -78.42) Variations in the strength of North Atlantic Ocean thermohaline circulation have been linked to rapid climate changes during the last glacial cycle through oscillations in North Atlantic Deep Water formation and northward oceanic heat flux. The strength of the thermohaline circulations depends on the supply of warm, salty water to the North Atlantic, which, after losing heat to the atmosphere, produces the dense water masses that sink to great depths and circulate back south. Here we analyse two Caribbean Sea sediment cores, combining Mg/Ca palaeothermometry with measurements of oxygen isotopes in foraminiferal calcite in order to reconstruct tropical Atlantic surface salinity during the last glacial cycle. We find that the Caribbean salinity oscillated between saltier conditions during the cold oxygen isotope stages 2, 4 and 6, and lower salinities during the warm stages 3 and 5, covarying with the strength of North Atlantic Deep Water formation. At the initiation of the Bolling/Allerod warm interval, Caribbean surface salinity decreased abruptly, suggesting that the advection of salty tropical waters into the North Atlantic amplified thermohaline circulation and contributed to high-latitude warming. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Schmidt, M.W. Investigator : Spero, H.J. Investigator : Lea, D.W. 2004-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2602 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/vm28-122-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp999a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/vm28-122-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp999a-tab.txt English https://www.ncdc.noaa.gov/paleo/study/2602 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/vm28-122-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp999a-tab.txt Schmidt, M.W., H.J. Spero, and D.W. Lea. 2004. Links between salinity variation in the Caribbean and North Atlantic thermohaline circulation. Nature 428:160-163. START YEAR: 135900 14C yr BP * END YEAR: 2780 14C yr BP -78.73 11.57 -78.42 12.75