A team of researchers, including climatologists and an astronomer, has utilized an enhanced computer model to recreate the ice age cycles that occurred between 1.6 and 1.2 million years ago. The findings indicate that the glacial periods were primarily influenced by astronomical forces in quite a di
fferent way than it works in the present day. This information will contribute to a more comprehensive understanding of ice sheets and the Earth’s climate throughout the past, present, and future.
The present-day glacial-interglacial cycle has a period of about 100,000 years. However, the glacial cycle in the early Pleistocene switched more rapidly, with a cycle of about 40,000 years. It has been believed that astronomical external forces are responsible for this change, but the details of the mechanism have not been understood.
“As geological evidence from older times comes to light, it is becoming clear that the Earth had a different climatic regime than it does today. We must have a different understanding of the role of astronomical forcing in the distant past,” says Takashi Ito from the, a member of this research team who led the discussion on astronomical external forces.
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