# Eastern Equatorial Pacific 100Kyr Benthic d18O and SST Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://www.hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:17288 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2014/dubois2014-43jc-d18O.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2014-03-27 #-------------------- # Title # Study_Name: Eastern Equatorial Pacific 100Kyr Benthic d18O and SST Data #-------------------- # Investigators # Investigators: Dubois, N.; Kienast, M.; Kienast, S.; Timmermann, A.; Mix, A. #-------------------- # Description_and_Notes # Description: The data set contains alkenone-based SST estimates, and benthic d18O from 3 cores from the eastern equatorial Pacific covering the late Quaternary. # # Methods: Cores ME0005A-24JC, ME0005A-27JC and ME0005A-43JC were analyzed for alkenone unsaturation at Dalhousie University following standard laboratory procedures detailed by Kienast et al. (2006). Sea-surface temperature estimates (UK'37 SST) were calculated from the ratio of the concentration of the di and triunsaturated alkenones, using the calibration of Prahl et al. (1988). The upper 500 cm of ME0005A-24JC were analyzed at WHOI following the same procedure and were previously published by Kienast et al. (2006). These data were shifted by +0.027 UK'37 units because of a laboratory offset determined from 10 replicate samples. Results from the last 25 kyr BP of core ME0005A-43JC were previously published in Dubois et al. (2009). Results of cores ME0005A-24JC and ME0005A-27JC were previously published in Dubois et al. (2011). # # Stable oxygen isotope measurements of benthic foraminifera from cores ME0005A-24JC, ME0005A-27JC and ME0005A-43JC were performed at the Oregon State University College of Earth, Ocean, and Atmospheric Sciences (OSU/CEOAS) Stable Isotope Mass Spectrometer Facility using a Kiel III carbonate preparation device connected to a Thermo-Finnigan MAT-252 mass spectrometer. The data were corrected to the accepted PDB scale using an internal lab calcite standard (Wiley) and the international calcite standard NIST-8544 (NBS-19, d18O=-2.20). External precision (1 standard deviation) of the Wiley standard of similar weight to the foraminiferal samples was 'b1 0.05 per mil. Results of cores ME0005A-24JC were previously published in Kienast et al. (2013). # # ADDITIONAL REFERENCES: # Benway, H.M., Mix, A.C., Haley, B.A., Klinkhammer, G.P., 2006. Eastern Pacific Warm Pool paleosalinity and climate variability: 0-30 kyr. Paleoceanography 21, PA3008. # # Drexler, J.W., Rose, W.I.J., Sparks, R.S.J., Ledbetter, M.T., 1980. The Los Chocoyos Ash, Guatemala: a major stratigraphic marker in middle America and in three ocean basins. Quaternary Research 13, 327-345. # # Dubois, N., M. Kienast, C. Normandeau and T.D. Herbert. 2009. The east equatorial Pacific cold tongue during the last glacial maximum as seen from alkenone paleothermometry. Paleoceanography, v. 24, PA4207. # # Dubois, N., M. Kienast, S. Kienast, C. Normandeau, S.E. Calvert, T.D. Herbert, and A. Mix. 2011. Millennial-scale variations in hydrography and biogeochemistry in the Eastern Equatorial Pacific over the last 100 kyr. Quaternary Science Reviews, Vol. 30, pp. 210-223. # # Kienast, M., S.S. Kienast, S.E. Calvert, T.I. Eglinton, G. Mollenhauer, R. François and A. Mix. 2006. Eastern Pacific cooling and Atlantic overturning circulation during the last deglaciation. Nature, v. 443, 846Ğ849, doi:10.1038/nature05222. # # Kienast, S., Friederich, T., Dubois, N., Hill, P. S., Timmermann, A., Mix, A. C., Kienast, M., 2013. Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1. Paleoceanography 28, 1-12. # # Kienast, S. S., M. Kienast, A. C. Mix, S. E. Calvert and R. Francois, 2007. Thorium-230 normalized particle flux and sediment focusing in the Panama Basin region during the last 30,000 years., Paleoceanography, 22, PA2213. # # Kusch, S., T. I. Eglinton, A. C. Mix and G. Mollenhauer, 2010. Timescales of lateral sediment transport in the Panama Basin as revealed by compound-specific radiocarbon ages of alkenones, Earth and Planetary Science Letters, 290, 340-350. # # Lisiecki, L. E. & Raymo, M. E., 2005. A Pliocene-Pleistocene stack of 57 globally distributed benthic d18O records. Paleoceanography 20, PA1003. # # Reimer, P. J., E. Bard, et al. (2013), IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP, Radiocarbon, 55, 1869-1887. # #-------------------- # Publication # Authors: Dubois, N., M. Kienast, S. Kienast, and A. Timmermann # Published_Date_or_Year: 2014 # Published_Title: Millennial-scale Atlantic/East Pacific sea surface temperature linkages # Journal_Name: Earth and Planetary Science Letters # Volume: 396 # Edition: # Issue: # Pages: 134-142 # DOI: 10.1016/j.epsl.2014.04.008 # Online_Resource: # Full_Citation: # Abstract: Amplifying both internally generated variability and remote climate signals from the Atlantic Ocean via coupled air-sea instabilities, the eastern tropical Pacific (ETP) is well situated to detect past climate changes and variations in Central American wind systems that dynamically link the Atlantic and the Pacific. Here we compare new and previously published alkenone-based sea surface temperature (SST) reconstructions from diverse environments within the ETP, i.e. the Eastern Pacific Warm Pool (EPWP), the equatorial and the northern Peruvian Upwelling regions over the past 100,000 years. Over this time period, a fairly constant meridional temperature gradient across the region is observed, indicating similar hydrographic conditions during glacial and interglacial periods. The data further reveal that millennial-scale cold events associated with massive iceberg surges in the North Atlantic (Heinrich events) generate cooling in the ETP from ~8°N to ~2°S. Data from Heinrich event 1 however indicate that the response changes sign south of 2'a1S. These millennial-scale alterations of the SST pattern across diverse environments of the ETP support previous climate modeling experiments that suggested an Atlantic-Pacific connection caused by the intensification of the Central American gap winds, enhanced upwelling and mixing north of the equator and supported by positive air-sea feedbacks in the eastern tropical Pacific. #------------------ # Funding_Agency # Funding_Agency_Name: Natural Sciences and Engineering Research Council of Canada (NSERC) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1010869 and 1204011 #------------------ # Funding_Agency # Funding_Agency_Name: Swiss National Science Foundation # Grant: PBSKP2-128454 #------------------ # Funding_Agency # Funding_Agency_Name: Canadian Institute for Advanced Research (CIFAR) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Geological Society of America (GSA) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Japan Agency for Marine-Earth Science and Technology # Grant: #------------------ # Site_Information # Site_Name: ME0005A-43JC d18O D14 # Location: Eastern Pacific # Country: # Northernmost_Latitude: 7.85583 # Southernmost_Latitude: 7.85583 # Easternmost_Longitude: -83.60833 # Westernmost_Longitude: -83.60833 # Elevation: -1368 m #-------------------------------- # Data Collection # Collection_Name: ME0005A-43JC d18O D14 # Oldest_Year: 85000 # Most_Recent_Year: 600 # Time_Unit: cal yr BP # Core_Length; # Notes: #-------------------------------- # Chronology: # #-------------------------------- # Variables # # Data variables follow (have double #'s) # Variables are one per line, shortname--tab- nine components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth_cm depth ,,,cm,,,,,N ## age_calkaBP age,,,kyr BP,,,,,N ## d18Ou.pereg delta 18O,Uvigerina peregrina,,per mil PDB,,Paleoceanography,,,N # # Data: # Missing Value: -999.99 depth_cm age_calkaBP d18Ou.pereg 1 0.6 3.11 6 1.52 3.28 11 2.43 3.3 16 3.35 3.28 21 4.26 3.25 26 5.18 3.21 31 5.66 3.39 36 6.15 3.33 41 6.63 3.41 46 7.11 3.38 51 7.6 3.24 56 8.08 3.53 61 8.56 3.14 66 9.04 3.48 71 9.53 3.53 81 10.49 3.7 86 10.98 3.59 91 11.46 3.74 96 12.02 3.67 101 12.57 3.99 106 13.13 3.71 111 13.68 4.25 116 14.24 4.34 121 14.79 4.17 126 15.35 4.2 131 15.9 4.48 136 16.37 4.21 141 16.83 4.79 146 17.3 4.55 151 17.77 4.84 156 18.24 4.8 161 18.7 5.05 166 19.17 4.93 171 19.64 4.98 176 20.11 4.87 181 20.57 4.81 186 21.04 4.82 201 22.06 4.28 206 22.4 5.03 211 22.77 4.81 216 23.16 4.69 221 23.54 5.01 226 23.92 4.69 231 24.31 4.71 236 24.69 4.83 241 25.08 4.85 246 25.46 4.85 251 25.85 4.67 256 26.23 4.92 261 26.62 4.75 266 27 4.88 271 27.37 4.89 276 27.74 4.79 281 28.11 4.8 286 28.49 4.48 291 28.86 4.73 296 29.23 4.66 301 29.6 4.55 306 29.97 4.46 311 30.34 4.61 316 30.71 4.8 321 31.09 4.62 326 31.46 4.62 331 31.83 4.55 336 32.2 4.65 341 32.57 4.51 346 32.94 4.54 351 33.31 4.48 356 33.69 4.49 361 34.06 4.56 371 34.8 4.63 376 35.17 4.42 381 35.54 4.47 386 35.91 4.6 391 36.29 4.58 396 36.66 4.57 401 37.03 4.5 406 37.4 4.4 411 37.77 4.47 416 38.14 4.31 421 38.51 4.41 426 38.89 4.47 431 39.26 4.52 436 39.63 4.5 441 40 4.63 446 40.5 4.6 451 41 4.4 456 41.5 4.38 461 42 4.52 466 42.5 4.4 471 43 4.44 476 43.5 4.32 481 44 4.58 485 44.32 4.22 491 44.8 4.3 495 45.12 4.26 501 45.6 4.45 506 46 4.19 511 46.4 4.1 516 46.8 4 521 47.2 4.32 526 47.6 4.36 531 48 4.55 536 48.22 4.49 541 48.43 4.52 546 48.65 4.52 551 48.87 4.53 556 49.09 4.49 561 49.3 4.34 566 49.52 4.6 571 49.74 4.7 576 49.96 4.27 581 50.17 4.37 586 50.39 4.27 591 50.61 4.3 596 50.83 4.23 601 51.04 4.39 606 51.26 4.24 611 51.48 4.35 616 51.7 4.17 621 51.91 4.29 626 52.13 4.36 631 52.35 4.26 636 52.57 4.38 641 52.78 4.3 646 53 4.48 651 53.5 4.4 656 54 4.44 661 54.5 4.45 666 55 4.28 671 55.5 4.33 676 56 4.18 681 56.5 4.22 686 57 4.34 691 57.5 4.11 696 58 4.27 701 58.5 4.34 706 59 4.4 711 59.5 4.4 716 60 4.52 721 61 4.41 726 62 4.65 731 62.5 4.53 736 63 4.55 741 63.5 4.48 746 64 4.39 751 64.5 4.45 756 65 4.54 761 65.5 4.6 766 66 4.61 801 68.63 4.1 806 69 4.56 811 69.5 4.5 816 70 4.4 821 70.5 4.2 826 71 4.2 831 71.5 4.09 836 72 4.23 841 72.5 4.27 846 73 4.33 851 73.5 4.17 856 74 4.13 866 75 4.06 871 75.5 4.01 876 76 4.15 881 76.5 4.15 886 77 4.19 891 77.5 4.1 896 78 4.06 901 78.5 4.01 906 79 4.01 911 79.5 3.97 916 80 3.97 921 80.5 3.86 951 83.5 3.74 956 84 3.74 961 84.5 3.83 966 85 3.99