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Ice ages

  1. Feb 17, 2009 #1


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    The glacial cycles are attributed to the climatic response of the orbital
    changes in the irradiance to the Earth (Milankovitch, 1930; Hays et al. , 1976).
    These changes in the forcing are to small to explain the observed climate variations
    as simple linear responses. Non-linear amplifications are necessary to
    account for the glacial cycles. Here an empirical model of the non-linear response
    is presented. From the model it is possible to assess the role of stochastic
    noise in comparison to the deterministic orbital forcing of the ice ages. The
    model is based on the bifurcation structure derived from the climate history.
    It indicates the dynamical origin of the Mid-Pleistocene transition (MPT)
    from the ’41 kyr world’ to the ’100 kyr world’. The dominant forcing in the
    latter is still the 41 kyr obliquity cycle, but the bifurcation structure of the climate
    system is changed.
  2. jcsd
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