Eastern Tropical Pacific ME0005A-24JC Deglacial Alkenone SST Data Kienast, M.; Kienast, S.S.; Calvert, S.E.; Eglinton, T.I.; Mollenhauer, G.; François, R.; Mix, A.C. Kienast, M. Kienast, S.S. Calvert, S.E. Eglinton, T.I. Mollenhauer, G. François, R. Mix, A.C. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,gram per square meter per kiloyear,null,paleoceanography,normalized,null,N,230Th-normalized burial flux) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ME0005A-24JC>LATITUDE .021667>LONGITUDE -86.463) Surface ocean conditions in the equatorial Pacific Ocean could hold the clue to whether millennial-scale global climate change during glacial times was initiated through tropical oceanŋatmosphere feedbacks or by changes in the Atlantic thermohaline circulation. North Atlantic cold periods during Heinrich events and millennial-scale cold events (stadials) have been linked with climatic changes in the tropical Atlantic Ocean and South America, as well as the Indian and East Asian monsoon systems, but not with tropical Pacific sea surface temperatures. Here we present a high-resolution record of sea surface temperatures in the eastern tropical Pacific derived from alkenone unsaturation measurements. Our data show a temperature drop of ~1 °C, synchronous (within dating uncertainties) with the shutdown of the Atlantic meridional overturning circulation during Heinrich event 1, and a smaller temperature drop of ~0.5 °C synchronous with the smaller reduction in the overturning circulation during the Younger Dryas event. Both cold events coincide with maxima in surface ocean productivity as inferred from 230Th-normalized carbon burial fluxes, suggesting increased upwelling at the time. From the concurrence of equatorial Pacific cooling with the two North Atlantic cold periods during deglaciation, we conclude that these millennial-scale climate changes were probably driven by a reorganization of the oceans' thermohaline circulation, although possibly amplified by tropical oceanŋatmosphere interaction as suggested before. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kienast, M. Investigator : Kienast, S.S. Investigator : Calvert, S.E. Investigator : Eglinton, T.I. Investigator : Mollenhauer, G. Investigator : François, R. Investigator : Mix, A.C. 2006-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6422 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/me5a24jc-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kienast2006b https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/me5a24jc-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kienast2006b English https://www.ncdc.noaa.gov/paleo/study/6422 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/me5a24jc-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kienast2006b Kienast, M., S.S. Kienast, S.E. Calvert, T.I. Eglinton, G. Mollenhauer, R. Franįois, and A.C. Mix. 2006. Eastern Pacific cooling and Atlantic overturningcirculation during the last deglaciation. Nature, 443, 846 - 849. START YEAR: 36250 cal yr BP * END YEAR: 1476 cal yr BP -86.463 .021667 -86.463 .021667