# 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-assem.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 assemblage 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 per mil 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) ## depth_top depth,,,cm,,,top of sample,,N ## foram-tot total number of foraminifera in sample,,,#,,,,,N ## %N.pachy-r/N.pachy-tot #N. pachyderma right coiling / (# N. pachyderma right coiling + # N. pachyderma left coiling),,,percent,,Paleoceanography,,,N ## N.pachy-l/cm3 Neogloboquadrina pachyderma left coiling,,,count/cm^3,,Paleoceanography,,,N ## N.pachy-r/cm3 Neogloboquadrina pachyderma right coiling,,,count/cm^3,,Paleoceanography,,,N ## G.bull/cm3 Globigerina bulloides,,,count/cm^3,,Paleoceanography,,,N ## T.quinq/cm3 Turborotalita quinqueloba,,,count/cm^3,,Paleoceanography,,,N ## warmforams/cm3 G. ruber + O. universa + N. dutertrei + G. inflata,,,count/cm^3,,Paleoceanography,,,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN depth_top foram-tot %N.pachy-r/N.pachy-tot N.pachy-l/cm3 N.pachy-r/cm3 G.bull/cm3 T.quinq/cm3 warmforams/cm3 5 223 3 121 4 17 46 0 15 161 3 115 4 8 10 1 20 212 17 90 19 52 19 1 25 126 3 29 1 51 4 1 30 291 3 223 7 29 2 0 40 110 5 84 4 10 0 0 45 218 11 126 15 18 5 0 55 279 9 150 15 20 12 0 95 112 29 52 21 9 1 1 100 234 19 132 30 23 6 12 105 239 34 63 33 56 6 4 155 140 15 68 12 19 3 0 170 1232 7 436 32 332 28 4 190 312 34 141 72 22 5 1 205 102 0 83 0 2 0 0 225 147 4 109 5 5 3 1 240 161 14 98 16 22 1 1 245 821 18 248 53 267 21 0 255 231 29 70 28 82 3 0 280 563 88 53 406 40 5 0 295 2133 89 170 1377 235 5 21 300 2700 82 328 1513 440 20 68 305 9376 84 896 4832 2208 64 256 310 1480 85 137 807 212 20 64 335 115 7 82 6 14 3 0 340 211 28 121 46 17 8 4 345 455 50 125 124 75 44 12 350 446 88 31 225 69 31 36 355 1344 83 116 572 152 144 92 370 1692 88 84 640 300 144 64 375 931 92 43 480 179 115 75 385 4941 79 409 1508 1520 288 112 390 4857 72 386 999 1632 288 160 395 5168 63 544 944 1936 496 112 400 5145 48 796 749 1712 320 48 405 5072 40 944 640 1792 432 32 410 6080 27 1520 576 1696 880 48 415 3093 9 1429 149 715 256 32 420 4062 3 2661 79 459 395 0 425 4720 4 2368 96 960 736 0 430 7099 3 3911 116 1360 624 32 435 14048 12 4000 544 3168 3744 128 440 3942 23 1101 333 806 986 38 445 2744 13 824 128 432 776 56 455 1861 15 555 101 288 613 32