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Sun & Cycles Heat Up Ice Age Interglacials by Doug L. Hoffman
Thursday, May 13th 2010, 3:36 PM EDT
Co2sceptic (Site Admin)
Image AttachmentSince the Mid-Brunhes Event, around 430,000 years ago, interglacial periods have grown warmer and their CO2 levels higher. Research confirms that Croll and Milankovitch were right: Earth's orbital cycles seem to be the cause of these documented cases of true global warming, with CO2 playing a supporting role, not the lead. Many of the catastrophic events warned of by climate change alarmists turn out to be well within the range of natural variation. Moreover, new findings indicate that the effects of the cycle induced changes, through their impact on the environment in the Southern Hemisphere, are not correctly accounted for in the IPCC models.

One of the big questions in climate science comes from studying recent interglacial periods—those relatively warm periods between bouts of ice age glaciation. It has been known for some time, that average temperatures during recent interglacials were warmer than during older ones. Writing in the April, 2010, edition of Nature Geoscience, Q. Z. Yin and A. Berger propose an answer as to why the amplitude (i.e. warming) of the glacial interglacial cycles increased significantly after the Mid-Brunhes Event (MBE) with cooler interglacials before the MBE than after. In their paper, entitled “Insolation and CO2 contribution to the interglacial climate before and after the Mid-Brunhes Event,” they describe their work as follows:

In parallel to the reconstruction of palaeoclimate based on proxy records, climate models are used to better understand past climate behaviour. In particular, efforts have been made over the past decade on modelling the most recent interglacials, namely the Holocene, the Eemian and the past five interglacials. Here, we focus on the forcing and global response of the climate system at the interglacial peaks of the past 800 kyr, using snapshot simulations to try to understand the difference between the post-MBE and the pre-MBE interglacials. The model used is LOVECLIM, with the atmosphere, ocean, sea ice and vegetation components interactively coupled and the ice sheets kept as today.

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