Anomalism
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- Dec 1, 2020
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Looking at this graphic, it’s actually a pretty clear visual explanation of how orbital changes drive Northern Hemisphere glacial interglacial cycles. The middle panel shows the three main orbital variations, precession (~19–24 kyr), obliquity (~41 kyr), and eccentricity (~95–125 kyr, ~400 kyr), which control how sunlight hits the Northern Hemisphere, especially during summer at high latitudes. That’s critical because ice sheet growth or melting is very sensitive to summer insolation.Show me.
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The left panel tracks cold vs. warm periods over the last million years, marking glacial vs. interglacial stages, and the right panel shows proxy records confirming those cycles. The arrows connecting the orbital variations to the proxy record illustrate the timing alignment: changes in orbit shift high-latitude insolation, which triggers ice sheet advance or retreat, producing the cycles we see in the geological record.
So yes, the northern hemisphere orbital variations are directly linked to the timing of glacial interglacial cycles, as the graphic makes clear.

