North Atlantic Benthic Foraminifera Stable Isotope Data Over the Past 21,000 Years Thornalley, D.J.R.; Elderfield, H.; McCave., I.N. Thornalley, D.J.R. Elderfield, H. McCave., I.N. earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (delta 18O,Melonis barleeanus,null,per mil VPDB,null,paleoceanography,corrected,null,N,ice-volume corrected) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,ka before 2000) earth science/paleoclimate/paleoceanography (delta 18O,Melonis barleeanus,null,per mil VPDB,null,paleoceanography,null,null,N,vital effect of -0.24 applied) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,corrected,null,N,ice-volume corrected) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,corrected,null,N,null) earth science/paleoclimate/paleoceanography (total foraminifers,null,null,count,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (RAPiD-12-1K>LATITUDE 62.08>LONGITUDE -17.82) (RAPiD-15-4P>LATITUDE 62.2994>LONGITUDE -17.1344) (RAPiD-17-5P>LATITUDE 61.481667>LONGITUDE -19.536) (RAPiD-10-1P>LATITUDE 62.9755>LONGITUDE -17.5895) Benthic foraminiferal stable isotope records from four high-resolution sediment cores, forming a depth transect between 1237 m and 2303 m on the South Iceland Rise, have been used to reconstruct intermediate and deep water paleoceanographic changes in the northern North Atlantic during the last 21 ka (spanning Termination I and the Holocene). Typically, a sampling resolution of ~100 years is attained. Deglacial core chronologies are accurately tied to North Greenland Ice Core Project (NGRIP) ice core records through the correlation of tephra layers and changes in the percent abundance of Neogloboquadrina pachyderma (sinistral) with transitions in NGRIP. The evolution from the glacial mode of circulation to the present regime is punctuated by two periods with low benthic d13C and d18O values, which do not lie on glacial or Holocene water mass mixing lines. These periods correlate with the late Younger Dryas/Early Holocene (11.5–12.2 ka) and Heinrich Stadial 1 (14.7–16.8 ka) during which time freshwater input and sea-ice formation led to brine rejection both locally and as an overflow exported from the Nordic seas into the northern North Atlantic, as earlier reported by Meland et al. (2008). The export of brine with low d13C values from the Nordic seas complicates traditional interpretations of low d13C values during the deglaciation as incursions of southern sourced water, although the spatial extent of this brine is uncertain. The records also reveal that the onset of the Younger Dryas was accompanied by an abrupt and transient (~200–300 year duration) decrease in the ventilation of the northern North Atlantic. During the Holocene, Iceland-Scotland Overflow Water only reached its modern flow strength and/or depth over the South Iceland Rise by 7–8 ka, in parallel with surface ocean reorganizations and a cessation in deglacial meltwater input to the North Atlantic. STUDY NOTES: Data collected by David J.R. Thornalley (Univ. of Cambridge); Principal Investigator: I. Nick McCave (Univ. of Cambridge); cruise CD-159, funded by UK RAPID program. Stable isotope values relative to VPDB standard, run in Godwin Laboratory, Univ. of Cambridge. "Ice-volume corrected" for whole ocean changes using Fairbanks (1989) sea-level curve, assuming a LGM to late Holocene shift of 1‰. RAPiD-12-1K: Vital effect of -0.24 applied to Melonis d18O data. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Thornalley, D.J.R. Investigator : Elderfield, H. Investigator : McCave., I.N. 2015-01-02 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17658 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-10-1p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-12-1k-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-15-4p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-17-5p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-10-1p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-12-1k-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-15-4p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-17-5p-benth.txt English https://www.ncdc.noaa.gov/paleo/study/17658 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-10-1p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-12-1k-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-15-4p-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-17-5p-benth.txt Thornalley, D.J.R., H. Elderfield, and I.N. McCave2010Intermediate and Deep Water Paleoceanography of the Northern North Atlantic Over the Past 21,000 yearsPaleoceanography25PA121110.1029/2009PA001833 START YEAR: 21726 cal yr BP * END YEAR: -50 cal yr BP -19.536 61.481667 -17.1344 62.9755