Posted by zog
on June 25, 2009, 1:08 am
A series of blasts, big ones. Researchers have looked at a series of volcanic eruptions a long time ago as forcing this oscillation between ice ages and warming periods. These volcanic blasts were so numerous and put so much iron into the air,(that caused immediate cooling from instant megashade) that after it settled in the oceans it caused a huge algal bloom, which in turn sucked a lot of co2 out of the atmosphere and started massive cooling, with polar ice caps developing. Ever since then, we have oscillated back and forth somewhat (more or less, that's what I got from the article). Article Volcanoes and ice ages Academic abstract Climate forcing by iron fertilization from repeated ignimbrite eruptions: The icehouse–silicic large igneous province (SLIP) hypothesis
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