# Santa Barbara Basin Stable Isotope and Foraminiferal Assemblage Data to 735 ka #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/19762 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/white2013/white2013-11jpc-pachy.txt # # Archive: Paleoceanography # # Parameter_Keywords: oxygen isotopes, carbon isotopes, population abundance #--------------------------------------- # Contribution_Date # Date: 2016-02-04 #--------------------------------------- # Title # Study_Name: Santa Barbara Basin Stable Isotope and Foraminiferal Assemblage Data to 735 ka #--------------------------------------- # Investigators # Investigators: White, Sarah M.; Hill, Tessa M.; Kennett, James P.; Behl, Richard J.; Nicholson, Craig #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: stadial, interstadial, glacial #--------------------------------------- # Publication # Authors: White, S.M., T.M. Hill, J.P. Kennett, R.J. Behl, and C. Nicholson # Published_Date_or_Year: 2013 # Published_Title: Millennial-scale variability to 735 ka: High-resolution climate records from Santa Barbara Basin, CA # Journal_Name: Paleoceanography # Volume: 28 # Issue: # Pages: 1-14 # Report Number: # DOI: 10.1002/palo.20022, 2013 # Full_Citation: # Abstract: Determining the ultimate cause and effect of millennial-scale climate variability remains an outstanding problem in paleoceanography, partly due to the lack of high-resolution records predating the last glaciation. Recent cores from Santa Barbara Basin provide ~2500–5700 year “windows” of climate with ~10–50 year resolution. Ages for three cores, determined by seismic stratigraphic correlation, oxygen isotope stratigraphy, and biostratigraphy, date to ~293 ka (MIS 8), ~450 ka (MIS 12), and ~735 ka (MIS 18). These records sample the Late Pleistocene, during which the 100 kyr cycle strengthened and the magnitude of glacial-interglacial cyclicity increased. Thus, these records provide a test of the dependence of millennial-scale behavior on variations in glacial-interglacial cyclicity. The stable isotopic (d18O) composition of planktonic foraminifera shows millennial-scale variability in all three intervals, with similar characteristics (duration, cyclicity) to those previously documented during MIS 3 at this site. Stadial G. bulloides d18O values are 2.75–1.75‰ (average 2.25‰) and interstadial values are 1.75–0.5‰ (average 1‰), with rapid (decadal-scale) interstadial and stadial initiations of 1-2‰, as in MIS 3. Interstadials lasted ~250–1600 years and occurred every ~650–1900 years. Stadial paleotemperatures were 3.5–9.5°C and interstadial paleotemperatures were 7.5–13°C. Upwelling, evidenced by planktonic foraminiferal assemblages and d13C, increased during interstadials, similar to MIS 3; high productivity during some stadials was reminiscent of the Last Glacial Maximum. This study builds upon previous records in showing that millennial-scale shifts were an inherent feature of Northern Hemisphere glacial climates since 735 ka, and they remained remarkably constant in the details of their amplitude, cyclicity, and temperature variability. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-0825322, OCE-0350573 #--------------------------------------- # Site Information # Site_Name: MV0508-11JPC # Location: Santa Barbara Basin # Country: USA # Northernmost_Latitude: 34.25 # Southernmost_Latitude: 34.25 # Easternmost_Longitude: -119.76 # Westernmost_Longitude: -119.76 # Elevation: -176.7 #--------------------------------------- # Data_Collection # Collection_Name: 11JPC Npachy-s White13 # First_Year: 295000 # Last_Year: 290500 # Time_Unit: cal yr BP # Core_Length: 4.58 # Notes: Ages are approximate - see White et al 2013 and supplementary online info for details. Precision of U. peregrina is ±0.04‰ for C isotopes and ±0.06‰ for O isotopes (performed at UC Davis); precision of N. pachyderma and G. bulloides is ±0.09‰ for both isotopes (performed at UC Santa Barbara). Foraminifera counts based on sample splits of >300 specimens. #--------------------------------------- # Chronology_Information # Chronology: # Cores were recovered from a submarine anticline that exposes pre-modern strata. Individual cores were placed in a chronostratigraphic framework using seismic stratigraphy in conjunction with well logs and seafloor outcrops; ages were refined using oxygen isotope stratigraphy, biostratigraphic datums, and a radiometrically dated ash layer. The sedimentation rate was used to estimate the length of time captured by each core. See White et al 2013 (including supplementary online info) for details. #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## core_name core name,,,,,,,,C ## depth_top depth,,,cm,,,top of sample,,N ## d18On.pachy-l delta 18O,Neogloboquadrina pachyderma left coiling,,per mil PDB,,Paleoceanography,,isotope ratio mass spectrometry,N ## d13Cn.pachy-l delta 13C,Neogloboquadrina pachyderma left coiling,,per mil PDB,,Paleoceanography,,isotope ratio mass spectrometry,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN core_name depth_top d18On.pachy-l d13Cn.pachy-l 11JPC 5 2.01 -0.839 11JPC 15 1.908 -0.397 11JPC 20 2.041 -0.482 11JPC 25 1.552 -0.911 11JPC 30 1.98 -1.038 11JPC 35 2.022 -1.502 11JPC 40 1.666 -0.887 11JPC 45 1.632 -1.442 11JPC 55 1.266 -0.905 11JPC 65 1.43 -2.37 11JPC 90 1.424 -0.835 11JPC 95 1.529 -1.448 11JPC 100 1.387 -1.217 11JPC 105 1.488 -1.901 11JPC 140 2.059 -0.36 11JPC 145 1.581 -1.734 11JPC 155 1.555 -1.708 11JPC 170 2.194 -4.939 11JPC 190 1.204 -1.229 11JPC 205 1.418 -0.541 11JPC 220 1.364 -0.495 11JPC 225 1.158 -0.581 11JPC 235 1.363 -1.033 11JPC 240 1.227 -1.14 11JPC 245 1.199 -0.806 11JPC 250 1.508 -0.586 11JPC 255 1.337 -0.32 11JPC 280 0.924 -0.811 11JPC 295 0.892 -1.193 11JPC 300 0.883 -1.179 11JPC 305 0.671 -0.959 11JPC 310 NaN NaN 11JPC 320 1.088 -0.207 11JPC 330 1.485 -0.041 11JPC 335 1.356 -0.499 11JPC 340 1.647 -0.828 11JPC 345 2.291 -1.275 11JPC 350 1.793 -1.593 11JPC 355 1.643 -1.496 11JPC 365 NaN NaN 11JPC 370 2.144 -1.659 11JPC 375 NaN NaN 11JPC 385 2.333 -2.033 11HR 390 2.307 -1.98 11JPC 395 2.429 -1.911 11JPC 400 2.366 -2.143 11JPC 405 2.137 -1.867 11JPC 410 2.43 -1.833 11JPC 415 2.645 -1.696 11JPC 420 2.477 -1.529 11JPC 425 2.586 -1.47 11JPC 430 2.492 -1.348 11JPC 435 2.631 -1.188 11JPC 440 2.33 -1.418 11JPC 445 2.468 -1.296 11JPC 455 2.292 -1.37