noaa-ocean-10493 Plio-Pleistocene Tropical Alkenone SST Reconstructions Herbert, T.D.; Peterson, L.C.; Lawrence, K.T.; Liu, Z. Plio-Pleistocene Tropical Alkenone SST Reconstructions 2010-06-22 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/10493 Investigator T.D. Herbert Investigator L.C. Peterson Investigator K.T. Lawrence Investigator Z. Liu 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 reconstruction geoscientificInformation Sea Surface Temperature Reconstruction 5069892 cal yr BP 1290 cal yr BP Complete -3.1 19.4567 -90.82 116.2729 -3824 -2028 Ocean Pacific Ocean South Pacific Ocean ODP 846B/D>LATITUDE -3.1>LONGITUDE -90.82 Ocean Atlantic Ocean South Atlantic Ocean ODP 662>LATITUDE -1.38>LONGITUDE -11.73 Ocean Pacific Ocean Western Pacific Ocean South China Sea IODP 1146>LATITUDE 19.4567>LONGITUDE 116.2729 Ocean Indian Ocean ODP722>LATITUDE 16.62>LONGITUDE 59.8 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 Herbert, T.D., L.C. Peterson, K.T. Lawrence, and Z. Liu 2010 Science 5985 328 1530-1534 10.1126/science.1185435

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).

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