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  • Data  (3)
  • Published Data from PANGAEA  (3)
  • 165-1002; Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Cayman Rise, Caribbean Sea; Comment; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg165; Ocean Drilling Program; ODP; Sample code/label; Δ14C; Δ14C, standard deviation  (1)
  • AGE; Age, 206Pb/207Pb Lead-Lead; Age, 230Thorium; Age, comment; Age, dated; Age, dated standard deviation; Corrected; DRILL; Drilling/drill rig; Florida shelf; Laboratory code/label; Legare_Anchorage; Measured; Method comment; Percivalia arata; Sample code/label; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Thorium-232/Thorium-230, standard deviation; Thorium-232/Thorium-230 ratio; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation  (1)
  • Age, 14C AMS; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Gravity corer (Kiel type); MARUM; Sample code/label; SL; SO161/5; SO161/5_22SL; Sonne; SPOC; Taxon/taxa; Δ14C  (1)
  • PANGAEA  (3)
Collection
  • Data  (3)
Source
  • Published Data from PANGAEA  (3)
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  • PANGAEA  (3)
Years
  • 1
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    (Table S1) Radiocarbon data of sediment core SO161/5 22SL (2010)
    PANGAEA
    In:  Supplement to: De Pol-Holz, Ricardo; Keigwin, Lloyd D; Southon, John R; Hebbeln, Dierk; Mohtadi, Mahyar (2010): No signature of abyssal carbon in intermediate waters off Chile during deglaciaition. Nature Geoscience, 3(3), 192-195, https://doi.org/10.1038/ngeo745
    Details
    Publication Date: 2023-06-27
    Description: At the end of the Last Glacial Maximum (19,000 to 11,000 years ago), atmospheric carbon dioxide concentrations rose while the Delta14C of atmospheric carbon dioxide declined**1, 2. These changes have been attributed to an injection of carbon dioxide with low radiocarbon activity from an oceanic abyssal reservoir that was isolated from the atmosphere for several thousand years before deglaciation**3. The current understanding points to the Southern Ocean as the main area of exchange between these reservoirs4. Intermediate water formed in the Southern Ocean surrounding Antarctica would have then carried the old carbon dioxide signature to the lower-latitude oceans**5, 6. Here we reconstruct the Delta14C signature of Antarctic Intermediate Water off the coast of Chile for the past 20,000 years, using paired 14C ages of benthic and planktonic foraminifera. In contrast to the above scenario, we find that the delta14C signature of the Antarctic Intermediate Water closely matches the modelled surface ocean Delta14C, precluding the influence of an old carbon source. We suggest that if the abyssal ocean is indeed the source of the radiocarbon-depleted carbon dioxide, an alternative path for the mixing and propagation of its carbon dioxide may be required to explain the observed changes in atmospheric carbon dioxide concentration and radiocarbon activity.
    Keywords: Age, 14C AMS; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Gravity corer (Kiel type); MARUM; Sample code/label; SL; SO161/5; SO161/5_22SL; Sonne; SPOC; Taxon/taxa; Δ14C
    Type: Dataset
    Format: text/tab-separated-values, 209 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    (Table S1) Age determination of ODP Site 165-1002 (2004)
    PANGAEA
    In:  Supplement to: Hughen, Konrad A; Lehman, Scott J; Southon, John R; Overpeck, Jonathan T; Marchal, Olivier; Herring, C; Turnbull, J (2004): 14C Activity and Global Carbon Cycle Changes over the Past 50,000 Years. Science, 303(5655), 202-207, https://doi.org/10.1126/science.1090300
    Details
    Publication Date: 2024-01-09
    Description: A series of 14C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in 14C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation.
    Keywords: 165-1002; Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Cayman Rise, Caribbean Sea; Comment; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg165; Ocean Drilling Program; ODP; Sample code/label; Δ14C; Δ14C, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 3013 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    (Table 1) U and Th isotopic composition and 230Th ages of samples from the A1 and C1 corals of Legare Anchorage (2008)
    PANGAEA
    In:  Supplement to: Druffel, Ellen R M; Robinson, Laura F; Griffin, Sheila; Halley, Roberet B; Southon, John R; Adkins, Jess F (2008): Low reservoir ages for the surface ocean from mid-Holocene Florida corals. Paleoceanography, 23(2), PA2209, https://doi.org/10.1029/2007PA001527
    Details
    Publication Date: 2023-12-11
    Description: The 14C reservoir age of the surface ocean was determined for two Holocene periods (4908-4955 and 3008-3066 calendar (cal) B.P.) using U/Th-dated corals from Biscayne National Park, Florida, United States. We found that the average reservoir ages for these two time periods (294 ± 33 and 291 ± 27 years, respectively) were lower than the average value between A.D. 1600 and 1900 (390 ± 60 years) from corals. It appears that the surface ocean was closer to isotopic equilibrium with CO2 in the atmosphere during these two time periods than it was during recent times. Seasonal d18O measurements from the younger coral are similar to modern values, suggesting that mixing with open ocean waters was indeed occurring during this coral's lifetime. Likely explanations for the lower reservoir age include increased stratification of the surface ocean or increased D14C values of subsurface waters that mix into the surface. Our results imply that a more correct reservoir age correction for radiocarbon measurements of marine samples in this location from the time periods ~3040 and ~4930 cal years B.P. is ~292 ± 30 years, less than the canonical value of 404 ± 20 years.
    Keywords: AGE; Age, 206Pb/207Pb Lead-Lead; Age, 230Thorium; Age, comment; Age, dated; Age, dated standard deviation; Corrected; DRILL; Drilling/drill rig; Florida shelf; Laboratory code/label; Legare_Anchorage; Measured; Method comment; Percivalia arata; Sample code/label; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Thorium-232/Thorium-230, standard deviation; Thorium-232/Thorium-230 ratio; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 170 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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