# 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/white2013-16jpc-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; 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: MV0508-16JPC # Location: Santa Barbara Basin # Country: USA # Northernmost_Latitude: 34.25 # Southernmost_Latitude: 34.25 # Easternmost_Longitude: -119.77 # Westernmost_Longitude: -119.77 # Elevation: 191 #--------------------------------------- # Data_Collection # Collection_Name: 16JPC assemblage White13 # First_Year: 452500 # Last_Year: 448500 # Time_Unit: cal yr BP # Core_Length: 460 cm # 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) ## 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 4 428 10 293 32 36 28 4 14 1258 3 802 24 124 148 20 19 3393 3 2009 64 384 432 40 24 1613 2 909 21 288 149 32 29 129 11 86 11 17 9 1 34 952 6 587 38 80 118 10 39 1082 7 677 53 117 128 14 44 1226 8 758 64 140 140 0 50 1899 8 1150 102 166 237 13 54 466 5 348 18 37 21 3 64 462 7 337 27 22 26 2 69 401 7 281 21 36 15 1 74 814 5 598 32 64 32 8 85 516 6 300 19 82 35 0 90 714 3 468 14 116 24 2 95 1726 4 1017 37 304 155 5 100 768 9 509 51 77 40 5 105 1578 6 1007 69 139 117 16 110 1682 12 1037 144 112 192 11 120 1239 16 623 116 60 316 4 125 838 10 483 53 77 120 5 130 787 8 444 37 53 123 0 135 674 11 376 46 56 104 8 140 1610 11 831 101 160 251 5 145 1047 5 730 38 102 74 0 150 623 6 377 24 56 68 2 155 943 7 617 48 99 38 6 165 867 5 552 27 112 40 11 170 416 6 242 16 60 18 7 175 229 6 166 11 19 7 8 180 205 5 123 6 24 22 2 185 1313 4 781 36 236 108 12 190 782 22 355 101 168 43 3 195 819 9 544 53 64 45 11 200 2398 6 1390 88 312 120 0 205 2590 7 1646 120 232 168 8 215 2483 6 1339 88 248 416 0 220 4028 7 2133 166 499 550 77 225 2359 12 1167 152 312 224 16 230 537 8 304 25 52 28 0 240 446 11 275 33 45 29 4 245 767 8 497 21 32 29 0 265 413 7 179 13 109 3 3 270 871 8 425 35 192 21 3 275 628 6 382 26 72 6 2 280 782 8 480 43 93 19 3 285 265 6 174 11 33 4 2 295 196 10 146 16 15 1 1 300 95 8 81 7 1 0 0