Glacial cycles and ice-sheet modelling |
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Authors: | J Oerlemans |
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Institution: | (1) Institute for Meteorology and Oceanography, University of Utrecht, Princetonplein 5, Utrecht, The Netherlands |
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Abstract: | An attempt is made to simulate the Pleistocene glacial cycles with a numerical model of the Northern Hemisphere ice sheets.
This model treats the vertically-integrated ice flow along a meridian, including computation of bedrock adjustment and temperature
distribution in the ice. Basal melt water is traced and controls ice-mass discharge.
The model produces asymmetric glacial cycles, even when it is not forced. Model parameters can be chosen such that cycles
with a duration of about 100 000 yr occur. Due to the production of basal melt water and bedrock sinking, deglaciations are
very rapid.
The occurrence of glacial cycles in the model is a stable feature, but thephase of the cycles is very sensitive to the model parameters. The main conclusion is that ice-sheet dynamics may provide an explanation
for the Pleistocene glacial cycles. However, the ‘predictability’ of the ice-volume record appears to be small. |
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Keywords: | |
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