Parametric Resonance Climate Model

The variations in the distribution of solar radiation due to the ∼10 5 years Milankovitch cycle alone cannot explain the sharp drop in temperature of approximately 10 K that marks the transition from the interglacial to the glacial age registered in the last ∼5.5 10 6 years temperature variation behavior. More specifically, only a temperature variation of 0.2÷0.3 K can be attributed to this ∼105 years cycle connected to the Earth eccentricity variation and, therefore, positive feedback effects should be taken into account to explain the registered effect. In the present work, a parametric resonance model for climate that justifies the temperature variation from the interglacial to the glacial age is postulated. According to this model, the system energization is due to periodic variations in the internal solar system parameters. In particular, it is put into evidence that the model works when only a weak oscillation is present in the system and that even small oscillations increase over time proportionally to the system energy itself, i.e., exponentially, and hence, a series of connected resonances is able to energize the system.