# Pacific Glacial Foraminiferal Radiocarbon and Stable Isotope 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://ncdc.noaa.gov/paleo/study/17375 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-13.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2014-10-27 #-------------------- # Title # Study_Name: Pacific Glacial Foraminiferal Radiocarbon and Stable Isotope Data #-------------------- # Investigators # Investigators: Keigwin, L.D; Lehman, S.J. #-------------------- # Description_and_Notes # Description: Radiocarbon and stable isotope (d18O and d13C) data measured on foraminifera from 7 Pacific Ocean sediment cores. #-------------------- # Publication # Authors: L.D. Keigwin and S.J. Lehman # Published_Date_or_Year: 2015 # Published_Title: Radiocarbon evidence for a possible abyssal front near 3.1 km in the glacial Equatorial Pacific Ocean # Journal_Name: Earth and Planetary Science Letters # Volume: submitted # Edition: # Issue: # Pages: # DOI: # Online_Resource: # Full_Citation: L.D. Keigwin and S.J. Lehman. Submitted. Radiocarbon evidence for a possible abyssal front near 3.1 km in the glacial Equatorial Pacific Ocean. Earth and Planetary Science Letters. # Abstract: We investigate the apparent radiocarbon ventilation age in deep equatorial Pacific sediment cores and integrate those results with similar data from around the North Pacific Ocean in a reconstruction for the last glaciation. Here we use the simplest definition of apparent ventilation age: the difference in conventional 14C age between coexisting benthic and planktonic foraminifera, and we consider the glacial interval to have lasted between 15 and 25 14C ka. Most new data from both the Equatorial Pacific and the Emperor Seamounts in the northwestern Pacific come from maxima in abundance of benthic taxa because this strategy reduces the effect of bioturbation. Although there remains considerable scatter in the ventilation age estimates, on average, ventilation ages in the Equatorial Pacific were significantly greater below 3.2 km (~3100 +/-1125 yrs, n=15) than in the depth interval 2.0 to 3.0 km (~1600 +/-310 yrs, n=8). When compared to the average modern seawater D14C profile for the North Pacific, the Equatorial Pacific glacial data suggest an abyssal front located somewhere between 3.0 and 3.2 km modern water depth. Above that depth, the data may indicate slightly better ventilation than today, and below that depth, glacial Equatorial Pacific data are as old as last glacial maximum (LGM) deep water ages reported for the deep southern Atlantic. This suggests that a glacial reservoir of aged waters extended throughout the circumpolar Southern Ocean and into the Equatorial Pacific. Such a large volume of aged (and, by corollary, carbon-rich) water would help to account for the rise in atmospheric pCO2 and the fall in D14C as the glaciation drew to a close and deep ocean ventilation increased. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: RNDB-13 # Location: Ocean>Pacific Ocean>North Pacific Ocean # Country: # Northernmost_Latitude: 49.725 # Southernmost_Latitude: 49.725 # Easternmost_Longitude: 168.3117 # Westernmost_Longitude: 168.3117 # Elevation: -3681 m #------------------ # Data_Collection # Collection_Name: Keigwin2015RNDB-13 # Earliest_Year: 19650 # Most_Recent_Year: 7690 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology: # # Table 3. Accelerator Mass Spectrometer results generated as part of this study. Glacial interval data used in Figure 5 are shown in bold. # # core water core taxa Accession Conventional error mean RMS on BF-PF RMS on # name "depth, m" interval number "14C age, yrs" 1s PF age PF pairs BF-PF # DSDP 480 655 "4-1, 109-112 cm " Uvigerina OS-47995 "17,650" 120 650 177 # """" """" """" "G.b., N.p.d." WHG-184* "17,000" 130 # RNDB 13PG 2380 5-7 G. bulloides OS-100199 "9,550" 40 # """" """" 13 Uvigerina OS-100200 "12,000" 50 "1,550" 64 # """" """" """" G. bulloides OS-99821 "10,450" 40 # """" """" 13.5 G. bulloides OS-66096 "10,000" 55 # RNDB 13PC 16 U. peregrina OS-66200 "7,690" 45 -630 57 # """" """" 15-17 G. bulloides OS-71380 "8,320" 35 # """" """" 27.5 Uvigerina OS-100201 "9,780" 45 -670 60 # """" """" """" G. bulloides OS-99822 "10,450" 40 # """" """" 52.5 U. peregrina OS-66097 "14,800" 65 "1,700" 96 # """" """" """" G. bulloides OS-66098 "13,100" 70 # """" """" 60.5-61.5 pachy + bullo CAMS 130534 "13,660" 90 # """" """" """" Uvigerina OS-56810 "16,000" 85 "2,340" 124 # """" """" 70.5-71.5 U. hispid OS-71383 "15,650" 95 "2,650" 118 # """" """" """" G. bulloides OS-71384 "13,000" 70 # """" """" 72 Uvigerina OS-99826 "14,900" 75 "1,850" 90 # """" """" """" G. bulloides OS-99823 "13,050" 50 # """" """" 80.5 Uvigerina OS-44153 "17,350" 90 "1,450" 108 # """" """" """" N. pachy s. "15,900" 60 # """" """" 100-101 U. hispid OS-71381 "20,100" 160 "2,600" 194 # """" """" """" N. pachy s. OS-71382 "17,500" 110 # """" """" 107-109 N. pachy s. OS-99827 "19,650" 110 # RNDB 5GGC 2804 75-77 Uvigerina OS-44155 "21,900" 160 "2,450" 200 # """" """" """" N.p.s. OS-44154 "19,450" 120 # ME0005-24JC 2941 290-292 G. ruber + sacc OS-112029 "15,300" 70 # """" """" 290-292 mixed BF OS-112030 "16,950" 80 "1,650" 106 # """" """" 352-354 G. sacculifera OS-112031 "18,400" 95 # """" """" 352-354 mixed BF OS-112032 "20,400" 170 "2,000" 195 # RNDB 11PC 3225 65 Uvigerina OS-99824 "14,250" 55 "1,150" 74 # """" """" """" G. bulloides OS-99825 "13,100" 50 # """" """" 71.5-72.5 G. bulloides CAMS-130532 "13,080" 60 # """" """" """" Uvigerina OS-57609 "14,400" 85 "1,320" 104 # """" """" 75.5-76.5 G. bulloides CAMS-130533 "13,140" 70 # """" """" """" Uvigerina OS-57485 "14,200" 80 "1,060" 106 # """" """" 108-112 Uvigerina OS-40772 "16,650" 110 "1,700" 139 # """" """" 108-109 N.p.s. OS-40773 "14,950" 85 # PLDS 7G 3253 37-38 Uvigerina OS-97443 "16,800" 110 "2,650" 149 # """" """" """" Cibicidoides OS-97444 "17,400" 120 "3,250" 156 # """" """" """" G. ruber OS-97721 "14,100" 60 "14,150" 100 # """" """" """" G. sacc. OS-97445 "14,200" 80 # """" """" 42-43 Uvigerina OS-97446 "19,700" 150 "3,275" 217 # """" """" """" Cibicidoides OS-97447 "19,100" 150 "2,675" 217 # """" """" """" G. ruber OS-97448 "16,150" 100 "16,425" 156 # """" """" """" G. sacc. OS-97449 "16,700" 120 # """" """" 48-49 Uvigerina OS-97450 "20,400" 160 "2,725" 228 # """" """" """" Cibicidoides OS-97451 "20,600" 160 "2,925" 228 # """" """" """" G. ruber OS-97452 "18,000" 120 "17,675" 163 # """" """" """" G. sacc. OS-97453 "17,350" 110 # VNTR01-10GGC 3410 30-31 G. sacc. OS-95335 "12,200" 45 "12,025" 83 # """" """" """" G. ruber OS-95343 "11,850" 70 # """" """" 34-35 G. sacc. OS-95342 "14,250" 55 "14,175" 78 # """" """" 34-35 G. ruber OS-95160 "14,100" 55 # """" """" 34-35 Cibicidoides OS-95422 "18,400" 100 "4,225" 127 # """" """" 46-47 G. sacc. OS-95333 "22,100" 85 "22,200" 124 # """" """" 46-47 G. ruber OS-95159 "22,300" 90 # """" """" 46-47 Uvigerina OS-95418 "24,300" 130 "2,100" 180 # """" """" 46-47 Cibicidoides OS-95168 "25,700" 130 "3,500" 180 # """" """" 50-51 G. sacc. OS-95161 "26,200" 120 "25,750" # """" """" """" G. ruber OS-95332 "25,300" 130 # KNR73 3PC 3606 22-23 G. sacculifera NSRL-18131 "3,555" 15 # """" """" 22-23 N. umbonifera NSRL-18137 "5,605" 25 "2,050" 29 # """" """" 31-32 G. ruber NSRL-18133 "6,830" 25 "6,620" 32 # """" """" 31-32 G. sacculifera NSRL-18132 "6,410" 20 # """" """" 31-32 N. umbonifera NSRL-18136 "8,070" 30 "1,450" 44 # """" """" 64-66 Uvigerina NSRL-14565 "17,470" 110 "2,743" 143 # """" """" 65-67 Cibicidoides NSRL-14566 "17,690" 90 "2,963" 129 # """" """" 65-66 G. ruber NSRL-14567 "14,610" 80 "14,728" 92 # """" """" 65-66 G. sacculifera NSRL-14568 "14,845" 45 # """" """" 80-82 N. umbonifera NSRL-18134 "24,630" 230 "2,250" 354 # """" """" 81-82 G. ruber NSRL-14569 "22,160" 190 "22,380" 269 # """" """" 81-82 G. sacculifera NSRL-14570 "22,600" 190 # """" """" 89-90 G. ruber NSRL-14571 "25,240" 250 "25,520" 340 # """" """" 89-90 G. sacculifera NSRL-14572 "25,800" 230 # """" """" 89-91 N. umbonifera NSRL-18135 "28,240" 420 "2,720" 540 # KNR73 4PC 3681 17.5-18.5 N. umbonifera NSRL-16555 "6,235" 40 "1,065" 43 # """" """" 17.5-18.5 G. sacculifera NSRL-16556 "5,170" 15 # """" """" 27.5-28.5 G. ruber NSRL-16557 "6,695" 25 "6,488" 32 # """" """" 27.5-28.5 G. sacculifera NSRL-16558 "6,280" 20 # """" """" 27.5-28.5 N. umbonifera NSRL-16559 "8,450" 50 "1,963" 59 # """" """" 42.5-44.5 Uvigerina NSRL-16560 "16,350" 70 "5,785" 80 # """" """" 42.5-43.5 G. sacculifera NSRL-16562 "10,755" 25 "10,565" 39 # """" """" 42.5-43.5 G. ruber NSRL-16563 "10,375" 30 # """" """" 43.5-44.5 G. ruber NSRL-16564 "11,920" 45 "12,010" 54 # """" """" 43.5-44.5 G. sacculifera NSRL-16565 "12,100" 30 # """" """" 43.5-44.5 Cibicidoides NSRL-16561 "16,920" 130 "4,910" 141 # """" """" 53.5-56.5 N. umbonifera OS-52610 "21,600" 110 "6,050" 153 # """" """" 53-56 Uvigerina OS- 61025 "17,350" 85 "1,800" 136 # """" """" 53.5-56.5 Cibicidoides OS-52618 "18,600" 90 "3,050" 139 # """" """" 53.5-56.5 G. sacculifera OS-52617 "15,500" 75 "15,550" 106 # """" """" 53.5-56.5 G. ruber OS-52619 "15,600" 75 # """" """" 69 G. sacculifera OS-51240 "21,200" 110 "20,830" 178 # """" """" 69 G. ruber NSRL-14561 "20,460" 140 # """" """" 67-70 N. umbonifera OS-51241 "25,100" 140 "4,270" 226 # """" """" 77 N. umbonifera NSRL-14562 "27,040" 360 "3,675" 398 # """" """" 77 G. ruber NSRL-14563 "24,020" 120 "23,365" 170 # """" """" 77 G. sacculifera NSRL-14564 "22,710" 120 # KNR73 6PG 3805 36.5 G. ruber OS-87792 "16,650" 65 "17,700" 115 # """" """" 36.5 G. sacculifera OS-87800 "18,750" 95 # """" """" 36.5 Cibicidoides OS-87841 "18,100" 110 "1,450" 159 # S67 FFC15 4250 17 N. umbonifera OS- 72992 "18,750" 90 "6,750" 210 # """" """" 17 ruber + sacc OS- 73653 "12,000" 190 # """" """" 25 N. umbonifera OS- 72989 "25,600" 170 "3,800" 270 # """" """" 25 G. sacculifera OS- 72988 "21,800" 210 # "*from Keigwin and Jones (1990, Deglacial oscillations in the Gulf of California, Paleoceanography 5:109-123)"# # # #---------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ##depth_cm depth, , , cm, , , , ,N ##d18Ouvige delta18O, Uvigerina sp., , per mil PDB, , , , ,N ##d13Cuvige delta13C, Uvigerina sp., , per mil PDB, , , , ,N ##notes notes - core ID,,,,,,,,C # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_cm d18Ouvige d13Cuvige notes 6 -0.395 3.289 RNDB 13PG 9 -0.359 3.199 RNDB 13PG 13 -0.916 3.82 RNDB 13PG 14.0 3.91 -1.1 RNDB 13PC 16.0 3.91 -0.97 RNDB 13PC 18.0 3.90 -0.8 RNDB 13PC 20.0 3.62 -0.99 RNDB 13PC 20 -1.029 4.049 RNDB 13PG 22.0 3.96 -0.97 RNDB 13PC 24.0 3.68 -1.14 RNDB 13PC 26.0 4.14 -1.18 RNDB 13PC 27 -0.998 4.072 RNDB 13PG 28.0 4.24 -1.08 RNDB 13PC 30.0 4.13 -1.09 RNDB 13PC 32.0 4.20 -1.27 RNDB 13PC 34.0 4.33 -1.29 RNDB 13PC 36.0 4.41 -0.95 RNDB 13PC 38.0 4.25 -1.01 RNDB 13PC 40.0 4.43 -0.99 RNDB 13PC 42.0 4.47 -0.91 RNDB 13PC 44.0 4.32 -0.91 RNDB 13PC 46.0 4.39 -1.1 RNDB 13PC 48.0 4.47 -0.92 RNDB 13PC 50.0 4.36 -0.93 RNDB 13PC 52.0 4.47 -0.88 RNDB 13PC 54.0 4.33 -0.96 RNDB 13PC 56.0 4.61 -0.99 RNDB 13PC 58.0 4.60 -0.84 RNDB 13PC 64.0 4.80 -0.781 RNDB 13PC 66.0 4.47 -0.714 RNDB 13PC 68.0 4.64 -0.93 RNDB 13PC 70.0 4.89 -0.693 RNDB 13PC 78.0 4.88 -0.94 RNDB 13PC 79.5 5.01 -1.055 RNDB 13PC 80.5 5.02 -0.92 RNDB 13PC 81.5 5.01 -0.904 RNDB 13PC 82.5 5.00 -0.777 RNDB 13PC 84.5 4.99 -0.862 RNDB 13PC 86.5 5.05 -0.928 RNDB 13PC 88.0 4.88 -1.1 RNDB 13PC 90.5 5.07 -0.693 RNDB 13PC 92.5 5.02 -0.825 RNDB 13PC 94.5 4.78 -0.887 RNDB 13PC 96.5 4.90 -0.909 RNDB 13PC 98.0 4.88 -1.01 RNDB 13PC 100.5 4.97 -0.815 RNDB 13PC 102.5 4.97 -0.7 RNDB 13PC 104.5 4.97 -0.74 RNDB 13PC 106.5 4.86 -0.923 RNDB 13PC 108.0 4.81 -0.99 RNDB 13PC 118.0 4.83 -0.96 RNDB 13PC 138.0 4.75 -0.95 RNDB 13PC 148.0 4.79 -0.91 RNDB 13PC 158.0 4.56 -0.97 RNDB 13PC 168.0 4.47 -0.99 RNDB 13PC 178.0 4.30 -0.85 RNDB 13PC 198.0 4.27 -1.03 RNDB 13PC 218.0 4.32 -0.84 RNDB 13PC 228.0 4.35 -0.82 RNDB 13PC 238.0 4.05 -1.27 RNDB 13PC 248.0 4.25 -1.09 RNDB 13PC 258.0 4.40 -1.02 RNDB 13PC 279.0 4.32 -1.09 RNDB 13PC 288.0 4.36 -1.12 RNDB 13PC 298.0 4.52 -1.17 RNDB 13PC 308.0 4.45 -0.96 RNDB 13PC 328.0 4.71 -1.13 RNDB 13PC 330.0 4.27 -1.12 RNDB 13PC 332.0 4.13 -1.03 RNDB 13PC 334.0 4.09 -0.98 RNDB 13PC 336.0 4.02 -0.9 RNDB 13PC 338.0 4.27 -0.79 RNDB 13PC 340.0 4.28 -0.96 RNDB 13PC 342.0 4.29 -1 RNDB 13PC 344.0 4.27 -1.07 RNDB 13PC 346.0 4.35 -0.83 RNDB 13PC 357.0 4.43 -0.96 RNDB 13PC 358.0 4.11 -0.95 RNDB 13PC 368.0 4.03 -0.98 RNDB 13PC 378.0 4.08 -0.87 RNDB 13PC 388.0 3.93 -0.61 RNDB 13PC 398.0 3.87 -0.84 RNDB 13PC 409.0 3.94 -0.68 RNDB 13PC 413.0 3.85 -0.81 RNDB 13PC 417.0 3.77 -0.64 RNDB 13PC 421.0 3.95 -0.72 RNDB 13PC 425.0 3.82 -0.84 RNDB 13PC 429.0 3.73 -1.08 RNDB 13PC 461.0 3.98 -1.21 RNDB 13PC 481.0 3.86 -0.73 RNDB 13PC 509.0 4.45 -0.94 RNDB 13PC 521.0 4.19 -0.86 RNDB 13PC 525.0 4.12 -0.91 RNDB 13PC 529.0 3.58 -0.77 RNDB 13PC 533.0 4.62 -0.98 RNDB 13PC 537.0 4.47 -0.89 RNDB 13PC 541.0 4.08 -0.87 RNDB 13PC 543.0 5.00 -1.12 RNDB 13PC 559.0 4.81 -1 RNDB 13PC 563.0 4.80 -1.34 RNDB 13PC 567.0 4.70 -1.32 RNDB 13PC 571.0 4.26 -0.97 RNDB 13PC 575.0 4.62 -1.29 RNDB 13PC 579.0 4.75 -0.92 RNDB 13PC 583.0 4.71 -1.09 RNDB 13PC 587.0 4.52 -1.05 RNDB 13PC 591.0 4.23 -1.02 RNDB 13PC 595.0 4.95 -0.84 RNDB 13PC 603.0 4.57 -1.34 RNDB 13PC 607.0 4.51 -1.41 RNDB 13PC 611.0 4.47 -1.1 RNDB 13PC 615.0 4.56 -1.39 RNDB 13PC 619.0 4.39 -1.08 RNDB 13PC 623.0 4.53 -1.07 RNDB 13PC 627.0 4.38 -0.99 RNDB 13PC 631.0 4.22 -1.19 RNDB 13PC 635.0 4.30 -1.06 RNDB 13PC 639.0 4.54 -1.07 RNDB 13PC 643.0 4.34 -1.13 RNDB 13PC 647.0 4.42 -1.13 RNDB 13PC 651.0 4.45 -1.15 RNDB 13PC 655.0 4.53 -1.04 RNDB 13PC 659.0 4.53 -1.03 RNDB 13PC 663.0 4.50 -1.29 RNDB 13PC 745.0 4.09 -1.36 RNDB 13PC 805.0 3.76 -0.87 RNDB 13PC 809.0 3.98 -0.84 RNDB 13PC 813.0 3.70 -0.85 RNDB 13PC 817.0 4.35 -1.18 RNDB 13PC 821.0 4.57 -1.27 RNDB 13PC 825.0 4.60 -1.11 RNDB 13PC 829.0 4.48 -1.34 RNDB 13PC 833.0 4.46 -1.31 RNDB 13PC 837.0 4.61 -1.37 RNDB 13PC 841.0 4.39 -1.42 RNDB 13PC 845.0 4.47 -1.29 RNDB 13PC