Abstract
A sectorially averaged model of the northern hemisphere has been developed, taking into account the coupling between the atmosphere, the upper ocean, sea-ice, the ice sheets and the underlying bedrock. It has been used to simulate the last glacial-interglacial cycle (last 122 kyr) as a response to the insolation and CO2 forcings (Gallée et al., 1992). In this paper a simulation of the climate of the last 200 kyr is presented. For this simulation, both the insolation forcing and the CO2 variations reconstructed from deep sea cores are taken into account. Except for variations with time scales shorter than 5 kyr, the simulated long term variation of the total ice volume may be compared with that reconstructed from deep sea cores. For example, the model simulates glacial maxima of similar amplitudes at 134 kyr B.P. and 15 kyr B.P., followed by abrupt deglaciations. The complete deglaciation of the three main northern hemisphere ice sheets, which is simulated around 122 kyr B.P., is in partial disagreement with the reconstructions, which indicate that the Greenland ice sheet survived during the Eemian interglacial. The continental ice volume variations during the last 122 kyr of the 200 kyr simulation are not significantly affected by this shortcoming.
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Gallée, H., Berger, A., Shackleton, N.J. (1993). Simulation of the Climate of the Last 200 Kyr with the LLN 2D-Model. In: Peltier, W.R. (eds) Ice in the Climate System. NATO ASI Series, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85016-5_19
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DOI: https://doi.org/10.1007/978-3-642-85016-5_19
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