Plio-Pleistocene Tropical Alkenone SST Reconstructions Herbert, T.D.; Peterson, L.C.; Lawrence, K.T.; Liu, Z. Herbert, T.D. Peterson, L.C. Lawrence, K.T. Liu, Z. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Uvigerina peregrina,null,per mil VPDB,null,paleoceanography,null,null,N,> 150 mm) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,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/paleocean (ODP 846B/D>LATITUDE -3.1>LONGITUDE -90.82) (ODP 662>LATITUDE -1.38>LONGITUDE -11.73) (IODP 1146>LATITUDE 19.4567>LONGITUDE 116.2729) (ODP722>LATITUDE 16.62>LONGITUDE 59.8) Determining the timing and amplitude of tropical sea surface temperature (SST) change is an important part of solving the puzzle of the Plio-Pleistocene ice ages. Alkenone-based tropical SST records from the major ocean basins show coherent glacial- interglacial temperature changes of 1° to 3°C that align with (but slightly lead) global changes in ice volume and deep ocean temperature over the past 3.5 million years. Tropical temperatures became tightly coupled with benthic d18O and orbital forcing after 2.7 million years. We interpret the similarity of tropical SST changes, in dynamically dissimilar regions, to reflect "top-down" forcing through the atmosphere. The inception of a strong carbon dioxide-greenhouse gas feedback and amplification of orbital forcing at ~2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time. STUDY NOTES: Alkenone data for 4 tropical ocean sediment cores, determined at Brown University. Data set includes composite depth, age estimated from matching stable isotope data to the Lisiecki and Raymo (2004) benthic stack, Uk'37 measured, and the conversion to estimated sea surface temperature (SST). Stable isotope data were generated at Brown University by Steven Clemens and Warren Prell. Note that the stable isotope data for ODP722 come from Clemens et al. (1996), sampled at ~7 kyr resolution, so the ages associated with the samples have more uncertainties than the other data sets published in Herbert et al. (2010). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Herbert, T.D. Investigator : Peterson, L.C. Investigator : Lawrence, K.T. Investigator : Liu, Z. 2010-06-22 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10493 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.xls English https://www.ncdc.noaa.gov/paleo/study/10493 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2010/herbert2010.xls Herbert, T.D., L.C. Peterson, K.T. Lawrence, and Z. Liu2010Tropical Ocean Temperatures over the Past 3.5 MyrScience59853281530-153410.1126/science.1185435 START YEAR: 5069892 cal yr BP * END YEAR: 1290 cal yr BP -90.82 -3.1 116.2729 19.4567