Publisher： John Wiley & Sons Inc
E-ISSN： 2156-2202|88|C9|5167-5190
ISSN： 0148-0227
Source： Journal Of Geophysical Research, Vol.88, Iss.C9, 1983-06, pp. : 5167-5190
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Abstract
We consider forced oscillations of a nonlinear climatic oscillator. The oscillator includes radiation balance, oceanic thermal inertia, a highly simplified hydrological cycle, the mass balance and plastic flow of ice sheets, the elasticity of the earth's crust, and the viscosity of its upper mantle, as well as their various interactions. This system exhibits self‐sustained periodic oscillations with amplitude of a few degrees Celsius in the absence of any periodic forcing. The oscillator's free period, depending on model parameters, lies roughly between 5000 yr and 15000 yr (5–15 ka). The model is subjected to forcing at the astronomical periodicities of precession, 19 and 23 ka, obliquity, 41 ka, and eccentricity, 100 ka and 400 ka. The forcing is assumed to act on the climatic system by variations in mean annual insolation, in the case of eccentricity, as well as by its effect on the ice‐mass balance through the nonlinear precipitation‐temperature feedback.
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