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  • -; Calcium carbonate; DEPTH, sediment/rock; Difference; Helium-3; Isotopic event; PC; Piston corer; TTN13-72  (1)
  • Ocean Drilling Program; ODP
  • PANGAEA  (2)
  • American Meteorological Society
  • 1995-1999  (2)
  • 1997  (2)
Collection
Keywords
Publisher
  • PANGAEA  (2)
  • American Meteorological Society
Years
  • 1995-1999  (2)
Year
  • 1
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    (Table 1) CaCO3 and He concentrations in sediment core TTN13-72 (1997)
    PANGAEA
    In:  Supplement to: Broecker, Wallace S; Sanyal, A (1997): Magnitude of the CaCO3 dissolution events marking the onset of times of glaciation. Paleoceanography, 12(4), 530-532, https://doi.org/10.1029/97PA01020
    Details
    Publication Date: 2023-11-25
    Description: The availability of CaCO3 and 3He content results for core TT 13-72 from 4.3 km depth in the equatorial Pacific (Marcantonio et al., 1996, doi:10.1038/383705a0) allows the magnitude of the excess (i.e., over ambient) CaCO3 dissolution at the onset of marine glacial stages 10, 8, and 6 to be estimated. These three events are remarkably similar; during each an integrated loss of about 28 g CaCO3 per cm² occurred. While the magnitude of this loss is consistent with that expected from the interglacial to glacial pH shifts reconstructed based on boron isotope measurements on benthic foraminifera (Sanyal et al., 1995, doi:10.1038/373234a0), measurements at a number of other locations and water depths will be required before this approach can be used to evaluate the global toll of these dissolution events.
    Keywords: -; Calcium carbonate; DEPTH, sediment/rock; Difference; Helium-3; Isotopic event; PC; Piston corer; TTN13-72
    Type: Dataset
    Format: text/tab-separated-values, 92 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Stable oxygen isotopes of late Quaternary sediments (1997)
    PANGAEA
    In:  Supplement to: Raymo, Maureen E (1997): The timing of major climate terminations. Paleoceanography, 12(4), 577-585, https://doi.org/10.1029/97PA01169
    Details
    Publication Date: 2024-01-09
    Description: A simple, untuned "constant sedimentation rate" timescale developed using three radiometric age constraints and eleven d18O records longer than 0.8 Myr provides strong support for the validity of the SPECMAP timescale of the late Quaternary (Imbrie et al., 1984). In particular, the present study independently confirms the link between major deglaciations (terminations) and increases in northern hemisphere summer radiation at high latitudes and shows that this correlation is not an artifact of orbital tuning. In addition, the excess ice characteristic of late Quaternary "100-kyr" climate cycles typically accumulates when July insolation at 65°N has been unusually low for more than a full precessional cycle, or 〉21 kyr, and once established does not last beyond the next increase in summer insolation. Thus, the timing of the growth and decay of large 100-kyr ice sheets, as depicted in the deep sea d18O record, is strongly (and semipredictably) influenced by eccentricity through its modulation of the orbital precession component of northern hemisphere summer insolation.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
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