noaa-ocean-20630 Eastern Equatorial Pacific SST Reconstrucition covering the last 1.5 Million Years Dyez, K.A.; Ravelo, A.C.; Mix, A.C. Eastern Equatorial Pacific SST Reconstrucition covering the last 1.5 Million Years 2016-10-21 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20630 Investigator K.A. Dyez Investigator A.C. Ravelo Investigator A.C. Mix 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 oxygen isotopes earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean reconstruction geoscientificInformation Sea Surface Temperature Reconstruction 1500400 cal yr BP 0 cal yr BP Complete -.672 -.672 -82.081 -82.081 -1414 -1414 Ocean Pacific Ocean Eastern Pacific Ocean ODP 1239>LATITUDE -.672>LONGITUDE -82.081 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Dyez, K.A., A.C. Ravelo, and A.C. Mix 2016 Paleoceanography 31 10.1002/2015PA002873

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-merge.txt Formatted Text File; ODP 1239 Merged SST Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-fig2b.pdf PDF File; SST Gradient graph (Figure 2b) from publication GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-d18o.txt Formatted Text File; ODP 1239 d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-gradient.txt Formatted Text File; ODP 1239 - ODP 846 SST Gradient Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-e10.txt Formatted Text File; ODP 1239 SST from Etourneau et al., 2010 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst.txt Formatted Text File; ODP 1239 SST from Dyez GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2016/dyez2016-sst-rm10.txt Formatted Text File; ODP 1239 SST from Rincón-Martínez et al., 2010 USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11