# 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/white2013-20jpc-pachy.txt # # Archive: Paleoceanography # # Parameter_Keywords: oxygen isotopes, carbon isotopes, population abundance, reconstruction #--------------------------------------- # 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; Hill, Tessa; Kennett, James; Behl, Richard; 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: MV0508-20JPC # Location: Santa Barbara Basin # Country: USA # Northernmost_Latitude: 34.22 # Southernmost_Latitude: 34.22 # Easternmost_Longitude: -119.67 # Westernmost_Longitude: -119.67 # Elevation: 128.5 #--------------------------------------- # Data_Collection # Collection_Name: 20JPC Npachy-s White13 # First_Year: 737000 # Last_Year: 733000 # Time_Unit: cal yr BP # Core_Length: 3.87 # Notes: Ages are approximate - see White et al 2013 and supplementary online info for details. Precision of N. pachyderma is ±0.04‰ for C isotopes and ±0.06‰ for O isotopes (performed at UC Davis); precision of U. peregrina 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: core_name depth_top d18On.pachy-l d13Cn.pachy-l 20JPC 5 1.99 -0.16 20JPC 10 2.01 -0.90 20JPC 15 1.93 -0.50 20JPC 20 1.72 -0.49 20JPC 25 1.63 -0.28 20JPC 35 1.63 -0.68 20JPC 40 1.85 -0.55 20JPC 45 2.28 -0.44 20JPC 50 2.19 -1.08 20JPC 55 2.25 -0.76 20JPC 60 2.23 -0.67 20JPC 65 2.30 -0.49 20JPC 70 2.50 -0.43 20JPC 75 2.28 -0.63 20JPC 85 2.31 -0.65 20JPC 90 2.10 -0.61 20JPC 95 1.93 -0.63 20JPC 100 1.54 -0.56 20JPC 105 1.89 -0.72 20JPC 110 1.66 -0.63 20JPC 115 1.83 -0.82 20JPC 120 1.84 -1.13 20JPC 125 1.74 -1.29 20JPC 135 2.34 -1.41 20JPC 140 2.06 -1.44 20JPC 145 1.96 -1.83 20JPC 150 2.06 -1.61 20JPC 155 2.30 -1.06 20JPC 160 2.23 -1.36 20JPC 165 2.22 -0.87 20JPC 170 2.07 -0.93 20JPC 175 2.07 -1.24 20JPC 180 2.24 -1.48 20JPC 185 1.70 -1.69 20JPC 195 1.80 -0.71 20JPC 200 1.71 -0.36 20JPC 205 1.80 -0.78 20JPC 210 1.59 -0.50 20JPC 215 1.57 -0.47 20JPC 220 1.54 -0.74 20JPC 225 1.63 -0.68 20JPC 230 1.80 -1.60 20JPC 235 1.47 -1.51 20JPC 245 2.27 -2.27 20JPC 250 2.22 -0.85 20JPC 265 2.32 -1.50 20JPC 270 2.08 -1.52 20JPC 275 2.07 -1.79 20JPC 280 1.91 -1.19 20JPC 285 1.92 -1.29 20JPC 295 1.79 -1.94 20JPC 300 1.82 -0.79 20JPC 305 1.64 -1.36 20JPC 315 1.64 -1.75 20JPC 320 1.39 -1.22 20JPC 325 1.40 -1.57 20JPC 330 1.28 -0.40 20JPC 335 1.41 -0.76 20JPC 340 1.44 -1.73 20JPC 345 1.39 -0.16 20JPC 350 1.47 -0.27 20JPC 355 1.89 -0.56 20JPC 360 2.16 -1.43 20JPC 365 2.17 -2.13 20JPC 375 2.01 -1.78 20JPC 380 2.19 -2.01 20JPC 385 1.97 -1.44