Intermediate and Deep Water Paleoceanography of the Northern North Atlantic Over the Past 21,000 years

noaa-ocean-17658 North Atlantic Benthic Foraminifera Stable Isotope Data Over the Past 21,000 Years Thornalley, D.J.R.; Elderfield, H.; McCave., I.N. North Atlantic Benthic Foraminifera Stable Isotope Data Over the Past 21,000 Years 2015-01-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17658 Investigator D.J.R. Thornalley Investigator H. Elderfield Investigator I.N. McCave. 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 oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation 21726 cal yr BP -50 cal yr BP Complete 61.481667 62.9755 -19.536 -17.1344 -2303 -1237 Ocean Atlantic Ocean North Atlantic Ocean RAPiD-12-1K>LATITUDE 62.08>LONGITUDE -17.82 Ocean Atlantic Ocean North Atlantic Ocean RAPiD-15-4P>LATITUDE 62.2994>LONGITUDE -17.1344 Ocean Atlantic Ocean North Atlantic Ocean RAPiD-17-5P>LATITUDE 61.481667>LONGITUDE -19.536 Ocean Atlantic Ocean North Atlantic Ocean RAPiD-10-1P>LATITUDE 62.9755>LONGITUDE -17.5895 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Thornalley, D.J.R., H. Elderfield, and I.N. McCave 2010 Intermediate and Deep Water Paleoceanography of the Northern North Atlantic Over the Past 21,000 years Paleoceanography 25 PA1211 10.1029/2009PA001833

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-10-1p-benth.txt Formatted Text File; RAPiD-10-1P Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-12-1k-benth.txt Formatted Text File; RAPiD-12-1K Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-15-4p-benth.txt Formatted Text File; RAPiD-15-4P Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-17-5p-benth.txt Formatted Text File; RAPiD-17-5P Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11