# 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/dubois2014-24jc-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-24JC # Location: Eastern Pacific # Country: # Northernmost_Latitude: 0.021667 # Southernmost_Latitude: 0.021667 # Easternmost_Longitude: -86.463 # Westernmost_Longitude: -86.463 # Elevation: -2941 m #-------------------------------- # Data Collection # Collection_Name: ME0005A-24JC d18O D14 # Oldest_Year: 54080 # Most_Recent_Year: 6570 # 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 42 6.57 3.47 52 7.75 3.45 62 8.39 3.46 72 9.04 3.63 82 9.66 3.56 92 10.1 3.74 102 10.54 3.73 112 10.98 3.48 122 11.42 3.45 132 11.86 3.86 142 12.3 3.89 152 12.74 4.08 162 13.18 4.1 172 13.61 4.14 182 14.05 4.35 202 14.93 4.39 212 15.37 4.87 222 15.81 4.8 232 16.24 4.59 242 16.62 4.78 252 17 4.84 262 17.39 4.9 282 18.15 5.13 292 18.55 5.25 302 19 4.92 341 20.78 5.06 351 21.24 5.03 362 22.38 5.08 372 23.42 4.79 382 24.46 4.92 392 25.5 4.87 402 26.54 4.86 412 27.58 4.78 422 28.61 4.84 432 29.65 4.71 442 30.69 4.71 452 31.73 4.81 462 32.77 4.55 472 33.81 4.56 482 34.85 4.49 502 36.92 4.35 512 37.96 4.58 522 39 4.67 532 40 4.54 542 41 4.49 552 42 4.69 562 43 4.51 572 44 4.7 582 45 4.47 592 46 4.52 602 47 4.45 612 48 4.66 622 48.63 4.57 632 49.25 4.65 642 49.88 4.6 652 50.5 4.49 662 51.13 4.49 672 51.75 4.47 682 52.38 4.43 692 53 4.57 702 54.08 4.59