Eastern Equatorial Pacific SST Reconstrucition covering the last 1.5 Million Years Dyez, K.A.; Ravelo, A.C.; Mix, A.C. Dyez, K.A. Ravelo, A.C. Mix, A.C. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,drill site) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,derived from Uk'37 using Müller et al. 1998 calibration SST = (Uk'37 - 0.044) / 0.033) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,data source) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,derived from alignment of benthic delta 18O with global LR04 stack) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,cruise leg) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,drill hole) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,derived from Uk'37 using Müller et al. 1998 calibration SST = (Uk'37 - 0.044) / 0.035) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,midpoint) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core type) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core section) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,midpoint depth) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,notes) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,derived from Uk'37 using Müller et al.) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,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,derived from Uk'37 using Müller et al. 1998 calibration SST = (Uk'37 - 0.044) / 0.034) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,mbsf) earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,averaged|corrected,null,N,average of Uvigerina and Cibicidoides delta 18O; after Cibicidoides value was corrected for species offset) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 1239>LATITUDE -.672>LONGITUDE -82.081) Sea surface temperature (SST) of the eastern equatorial Pacific is a key component of tropical oceanic and atmospheric circulation with global teleconnections. Forcing factors such as local and high-latitude insolation changes, ice sheet size and albedo feedbacks, and greenhouse gas radiation have been proposed as controls of long-term eastern tropical Pacific SST, though the precise role each mechanism plays is not fully known on glacial-interglacial or longer timescales. Here proposed mechanisms are evaluated by comparing orbital-scale records of eastern Pacific SST with forcing variability over the past 1.5 Ma. The primary SST records are a compilation of new and existing data from Ocean Drilling Program Site 1239 at the northeastern margin of the modern eastern Pacific cold tongue and Site 846 SST within the cold tongue. Using time series analysis, we test previously proposed mechanisms for control of long-term tropical SST change and SST gradients in the eastern Pacific. We find that within statistical uncertainties, in the precession band eastern Pacific SST is consistent with direct forcing by equatorial radiation changes in the tropical cold season (summer-fall) rather than inversely correlated as previously suggested. In the obliquity band high-latitude solar forcing leads or is in phase with eastern equatorial Pacific SST, while in the eccentricity band atmospheric greenhouse gas concentrations are closely associated with cold tongue SST. Pleistocene eastern Pacific SST gradients indicate that the gradient on the northern margin of the cold tongue strengthened through the mid-Pleistocene transition, a result compatible with the cold tongue becoming more focused at ~900–650 ka STUDY NOTES: Alkenone-based sea surface temperatures and age model based on benthic oxygen isotopes. Study covers 1.5 Ma to present. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Dyez, K.A. Investigator : Ravelo, A.C. Investigator : Mix, A.C. 2016-10-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20630 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-merge.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-fig2b.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-gradient.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-e10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-rm10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-merge.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-fig2b.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-gradient.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-e10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-rm10.txt English https://www.ncdc.noaa.gov/paleo/study/20630 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-merge.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-fig2b.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-gradient.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-e10.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-rm10.txt Dyez, K.A., A.C. Ravelo, and A.C. Mix2016Evaluating drivers of Pleistocene eastern tropical Pacific sea surface temperaturePaleoceanography3110.1002/2015PA002873 START YEAR: 1500400 cal yr BP * END YEAR: 0 cal yr BP -82.081 -.672 -82.081 -.672