# 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-11pc.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-11PC # Location: Ocean>Pacific Ocean>North Pacific Ocean # Country: # Northernmost_Latitude: 51.0733 # Southernmost_Latitude: 51.0733 # Easternmost_Longitude: 167.975 # Westernmost_Longitude: 167.975 # Elevation: -3225 m #------------------ # Data_Collection # Collection_Name: Keigwin2015RNDB-11PC # Earliest_Year: 16650 # Most_Recent_Year: 13100 # 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 ##d18On.pachy-l delta18O, Neogloboquadrina pachyderma (left coiling), , per mil PDB, , , , ,N ##d13Cn.pachy-l delta13C, Neogloboquadrina pachyderma (left coiling), , per mil PDB, , , , ,N ##notes notes ,,,,,,,,C # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_cm d18Ouvige d13Cuvige d18On.pachy-l d13Cn.pachy-l notes 9 3.32 -0.32 2.31 0.08 13.5 3.21 -0.22 19 3.38 -0.48 2.2 0.41 24 3.45 -0.61 2.31 0.5 29 3.84 -0.97 2.37 0.4 34 3.92 -0.82 2.49 0.34 39 4.02 -0.92 2.64 0.46 44 4.24 -1.03 2.79 0.37 49 4.27 -1.11 3.2 0.12 54 4.26 -1.3 2.8 -0.03 59 4.24 -1.3 3.05 0.02 64 4.43 -1.05 2.69 0.01 69 4.4 -1.18 2.86 -0.01 74 4.43 -1.02 2.87 -0.1 79 4.39 -1.08 2.71 -0.03 84 4.44 -0.82 3.08 -0.03 89 4.78 -1.02 3.47 -0.06 94 4.93 -0.9 3.66 -0.08 98.5 4.76 -1 3.63 -0.12 104 5.15 -0.72 3.5 -0.01 104 4.92 -0.78 replicate analysis 105 4.86 -0.93 3.72 -0.06 108 -1.34 3.63 -0.08 108 4.86 -0.91 108 4.89 -0.77 109 5.06 -0.79 3.53 -0.13 109 4.91 -0.7 3.56 -0.15 110 4.9 -0.82 3.75 -0.08 111 4.93 -1.07 3.65 -0.1 112 4.93 -0.94 3.72 -0.09 113 4.93 -0.92 3.71 -0.25 114 5.05 -0.99 3.63 0.07 116 4.92 -1.06 3.67 0.09 119 4.99 -0.94 3.41 0.07 124 4.96 -0.99 3.38 0.1 129 4.87 -1.01 3.5 -0.04 134 5.01 -0.99 3.54 -0.08 139 3.48 -0.01 144 3.32 -0.04 149 3.23 -0.01 159 3.36 0.03 169 3.17 -0.04