Pacific Glacial Foraminiferal Radiocarbon and Stable Isotope Data Keigwin, L.D.; Lehman, S.J. Keigwin, L.D. Lehman, S.J. earth science/paleoclimate/paleoceanography (delta 13C,Nuttallides umbonifera,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on Finigan) earth science/paleoclimate/paleoceanography (number of samples,null,null,count,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,analysis date) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 13C,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on pristine individual C. wuellerstorfi on Finigan) earth science/paleoclimate/paleoceanography (delta 18O,Uvigerina sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Uvigerina sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on pristine individual C. wuellerstorfi on Finigan) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on individual Cibicidoides wuellerstorfi on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Nuttallides umbonifera,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on Finigan) earth science/paleoclimate/paleoceanography (delta 13C,Nuttallides umbonifera,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on Finigan) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core ID) earth science/paleoclimate/paleoceanography (delta 18O,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Nuttallides umbonifera,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on Finigan) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on individual Cibicidoides wuellerstorfi on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 13C,Cibicides kullenbergi,null,per mil PDB,null,paleoceanography,averaged,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,Measurements on VG Prism at NOSAMS) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (RNDB-11PC>LATITUDE 51.0733>LONGITUDE 167.975) (RNDB-13>LATITUDE 49.725>LONGITUDE 168.3117) (KNR73-4PC>LATITUDE 1.848>LONGITUDE -110.2667) (KNR73-6PC>LATITUDE 4.002>LONGITUDE -114.187) (VNTR01-10PC>LATITUDE -4.507>LONGITUDE -102.015) (S67-15FFC>LATITUDE -1.608>LONGITUDE 162.558) (PLDS-7G>LATITUDE -3.338>LONGITUDE -102.453) 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. STUDY NOTES: Radiocarbon and stable isotope (d18O and d13C) data measured on foraminifera from 7 Pacific Ocean sediment cores. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Keigwin, L.D. Investigator : Lehman, S.J. 2014-10-27 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17375 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-11pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-13.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015vntr01-10pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-4pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015plds-7g.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015ffc15.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-6pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-11pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-13.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015vntr01-10pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-4pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015plds-7g.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015ffc15.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-6pc.txt English https://www.ncdc.noaa.gov/paleo/study/17375 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-11pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015rndb-13.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015vntr01-10pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-4pc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015plds-7g.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015ffc15.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2015/keigwin2015knr73-6pc.txt L.D. Keigwin and S.J. Lehman2015Radiocarbon evidence for a possible abyssal front near 3.1 km in the glacial Equatorial Pacific OceanEarth and Planetary Science Letters42593-10410.1016/j.epsl.2015.05.025https://www.sciencedirect.com/science/article/pii/S0012821X15003210 START YEAR: 26200 cal yr BP * END YEAR: 5170 cal yr BP -114.187 -4.507 168.3117 51.0733