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Title
  • en Deglaciation of the Northern Hemisphere at the onset of the Eemian and Holocene
Creator
    • en Wyrwoll, Karl-Heinz
    • en Eisenhauer, Anton
Accessrights open access
Rights
  • en © 1999 International Glaciological Society
Subject
  • Other en Milankovitch forcing
  • Other en Deglaciation
  • Other en Northern hemisphere
  • Other en Ice sheet
  • Other en Simulation
  • NDC 452
Description
  • Abstract en High resolution (TIMS) U-series dating of sea-level events obtained from coral-reef complexes suggests that global deglaciation from the Saale (penultimate) glacial to the Eem Interglacial (marine δ18O stages 6/5) may have occurred earlier in relation to Milankovitch insolation forcing than that from the Wisconsinan glacial to the Holocene Interglacial (marine δ18O stages 2/1). However, the interpretation of these data has been problematic because of the possibility of isotope exchange. In order to investigate whether these different lead-lag relations between Milankovitch forcing and ice volume are feasible from the point of view of large-scale ice-sheet dynamics and thermodynamics, the three-dimensional polythermal ice-sheet model SICOPOLIS (Simulation Code for Polythermal Ice Sheets) is applied to the entire Northern Hemisphere (which gives the major contribution to global ice-volume changes due to the relative stability of the Antarctic ice sheet) and simulations through the last two climatic cycles are conducted. The simulations cover the interval from 250 kyr BP until today and are driven by surface-temperature reconstructions of deep ice cores (GRIP, Vostok) and simple parameterizations for the change of precipitation with time. Discussion of the results is focused on the Saale/Eem and the Wisconsinan/Holocene transitions. The amount and rate of deglaciation are in good agreement with the SPECMAP record for both cases, and the evidence of the data for an early start of the Eem Interglacial is supported.
Publisher en International Glaciological Society
Date
    Issued1999-01
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/34647
Relation
  • URI http://www.igsoc.org/
  • isIdenticalTo DOI https://doi.org/10.3189/172756499781821643
Journal
    • PISSN 0260-3055
    • EISSN 1727-5644
      • en Annals of Glaciology
      • Volume Number28 Page Start1 Page End8
File
Oaidate 2023-07-26