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Using the Earth system model of intermediate complexity CLIMBER‐2 we studied the stability diagram of the climate‐cryosphere system in the phase space of Milankovitch forcing (maximum summer insolation at 65°N, abbreviated as MF). We have shown that the equilibrium response of the climate‐cyrosphere system to MF reveals pronounced hysteresis behavior within the range of Earth's orbital parameters. Depending on MF, the climate‐cryosphere system has either one (glacial or interglacial) or two different equilibrium states. The MF thresholds of the transitions between the two states depend on parameterizations of ice‐sheet dynamics, but are rather insensitive to the choice of the orbital parameters used to obtain the same value of MF. A change of atmospheric CO 2 concentration from its interglacial to the glacial value, shifts the hysteresis curve by about 15 W/m 2 . These results provide an important support to the conceptual models of glacial cycles based on multistability and hysteresis behavior.
Calov et al. (Tue,) studied this question.