Milankovitch Variations

Northern Hemisphere temperature history as modeled using Milankovitch variations in solar radiation

The Northern Hemisphere temperature history as modeled using Milankovitch variations in solar radiation modulated by volcanic aerosols, using oceans and carbon dioxide only as minor dependent variables. BP means before 1955 CE.

This figure captures very well, the “little ice age”, the Medieval Warm Period, and other known variations of late BCE and early CE times. The drivers of this model are Milankovitch calculations (average for the entire Hemisphere) and the observed volcanic record described above. Carbon dioxide is treated as a very minor dependent variable. It is unlikely that a general circulation model which assumes a major role of carbon dioxide can duplicate this known climatic sequence.

This entry was posted on Thursday, February 8th, 2007 at 1:09 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

  1. Joseph L. Ushie says:
    February 21, 2007 at 3:49 pm

    Thanks for your presentations. incidentally, I am working on diurnal and seasonal global solar radiation as a graduate student of the University of Calabar, Nigeria. I would be glad if you can assist me with related literature in my work.

    I am almost behind time and would be glad to hear from you soonest.

    Thanks.

    Joseph L. Ushie.

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