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  • 151-910A; Age, comment; Age, dated; Age, maximum/old; Age, minimum/young; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg151; North Greenland Sea; Ocean Drilling Program; ODP; Reference/source; Sedimentation rate  (1)
  • 151-911A; DRILL; Drilling/drill rig; Joides Resolution; Leg151; North Greenland Sea; Ocean Drilling Program; ODP  (1)
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  • 1
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    Unbekannt
    Neodymium, lead and strontium isotope data of down core leachate and bulk digest of ODP Hole 151-911A (2016)
    PANGAEA
    In:  Supplement to: Teschner, Claudia; Frank, Martin; Haley, Brian A; Knies, Jochen (2016): Plio-Pleistocene evolution of water mass exchange and erosional input at the Atlantic-Arctic gateway. Paleoceanography, 31(5), 582-599, https://doi.org/10.1002/2015PA002843
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: Water mass exchange between the Arctic Ocean and the Norwegian-Greenland Seas has played an important role for the Atlantic thermohaline circulation and Northern Hemisphere climate. We reconstruct past water mass mixing and erosional inputs from the radiogenic isotope compositions of neodymium (Nd), lead (Pb), and strontium (Sr) at Ocean Drilling Program site 911 (leg 151) from 906 m water depth on Yermak Plateau in the Fram Strait over the past 5.2 Myr. The isotopic compositions of past bottom waters were extracted from authigenic oxyhydroxide coatings of the bulk sediments. Neodymium isotope signatures obtained from surface sediments agree well with present-day deepwater epsilon-Nd signature of -11.0 ± 0.2. Prior to 2.7 Ma the Nd and Pb isotope compositions of the bottom waters only show small variations indicative of a consistent influence of Atlantic waters. Since the major intensification of the Northern Hemisphere Glaciation at 2.7 Ma the seawater Nd isotope composition has varied more pronouncedly due to changes in weathering inputs related to the waxing and waning of the ice sheets on Svalbard, the Barents Sea, and the Eurasian shelf, due to changes in water mass exchange and due to the increasing supply of ice-rafted debris (IRD) originating from the Arctic Ocean. The seawater Pb isotope record also exhibits a higher short-term variability after 2.7 Ma, but there is also a trend toward more radiogenic values, which reflects a combination of changes in input sources and enhanced incongruent weathering inputs of Pb released from freshly eroded old continental rocks.
    Schlagwort(e): 151-911A; DRILL; Drilling/drill rig; Joides Resolution; Leg151; North Greenland Sea; Ocean Drilling Program; ODP
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
  • 2
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    Unbekannt
    (Table DR1) Age model of ODP Hole 151-910A (2007)
    PANGAEA
    In:  Supplement to: Knies, Jochen; Matthiessen, Jens; Mackensen, Andreas; Stein, Ruediger; Vogt, Christoph; Frederichs, Thomas; Nam, Seung-Il (2007): Effects of Arctic freshwater forcing on thermohaline circulation during the Pleistocene. Geology, 35(12), 1075-1078, https://doi.org/10.1130/G23966A.1
    Details
    Publikationsdatum: 2024-04-27
    Beschreibung: In this paper, we make use of calcium carbonate-bearing sediment sequences in the Arctic-Atlantic gateway to produce a standard reference climate record for the Arctic Ocean. We present a continuous and exceptionally well-dated marine sediment record documenting the strong imprint of Arctic freshwater pulses on Earth's climate system throughout the past 0.8 m.y. Planktic foraminiferal oxygen and carbon isotope data reveal that freshwater plumes released from collapsing circum-Arctic ice sheets and ice-dammed lakes were advected to the Arctic Ocean gateway on sub-Milankovitch time scales. Given the close correspondence of Arctic freshwater pulses and strength of North Atlantic Deep Water formation as inferred from carbon isotope data, we conclude that freshening of the Arctic Ocean influenced thermohaline circulation more frequently than previously recognized. Our data show that it is critical for coupled atmosphere-ice-ocean general circulation models aimed at unraveling climate forcing factors during the Pleistocene to consider Arctic freshwater as a crucial forcing factor.
    Schlagwort(e): 151-910A; Age, comment; Age, dated; Age, maximum/old; Age, minimum/young; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg151; North Greenland Sea; Ocean Drilling Program; ODP; Reference/source; Sedimentation rate
    Materialart: Dataset
    Format: text/tab-separated-values, 81 data points
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
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