Résultats de la recherche (6 résultats)

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  • A comparison of deep Antarctic ice cores and their implications for climate between 65,000 and 15,000 years ago
  • In these cores, climatic information is mostly derived from the isotopic profiles (deuterium/hydrogen and/or 18O/16O ratios) from which surface temperature and, more indirectly, precipitation rate can be estimated. The time scales have been examined
  • in detail and a new 40,000 yr chronology for the Dome C core adopted. Special emphasis is placed on the link between the concentration of 10Be and past accumulation changes and on the use of peaks in the concentration of this cosmogenic isotope
  • 1989
  • AMS-14C ages measured in deep sea cores from the Southern Ocean : implications for sedimentation rates during isotope stage 2
  • C14 dates obtained by accelerator mass spectrometry (AMS) on monospecific foraminiferal samples from two deep-sea sediment cores raised in the Indian sector of the southern Ocean have been corrected for the difference in C14 composition between
  • atmosphere and sea surface by using a reconstruction of the latitudinal C14 gradient which existed in the Southern Ocean prior to 1962. The corrected AMS-C14 data show a reduced sedimentation rates in core MD 84-527 between 25,000 and 10,000 yr B.P. For core
  • 1989
  • Pingos in Antarctica appear to be residual landforms that have formed on the surface of the moraine as the ice core has been destroyed by ablation and thermal erosion. This interpretation appears to have misinterpreted tension cracks and coherent
  • of the ice core of moraines.
  • 1989
  • The AA. describe here late Quaternary paleoclimate, ice-volume change, and dynamics of the Ross ice drainage system using data from a powerful combination of drift sheets and ice cores.
  • 1989
  • before 2 200 yr B.P. The Holocene temperature changes of between 0.5 and 1.0o C are comparable in scale and timing to those identified from recent analyses of Vostok ice cores from the Antarctic ice sheet.
  • 1989
  • Piston cores and single-channel seismic reflection data were collected during the Deep Freeze 85 and 86 expeditions to determine the late Quaternary history of the area. Seismic data in the bay show a rugged seafloor, with numerous deep troughs
  • 1989