Astronomical Forcing and Terrestrial Amplification: The Physics of Glacial-Interglacial Cycles
Orbital Mechanics and Systemic Feedbacks The Astronomical Clock: Milankovitch Pacemakers The transition between glacial and interglacial states is driven by quasi-periodic variations in Earth's orbital…
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Astronomical Forcing and Terrestrial Amplification: The Physics of Glacial-Interglacial Cycles
Orbital Mechanics and Systemic Feedbacks The Astronomical Clock: Milankovitch Pacemakers The transition between glacial and interglacial states is driven by quasi-periodic variations in Earth's orbital geometry, collectively known as Milankovitch cycles. These astronomical cycles do not substantially alter the net annual solar energy received by the Earth as a whole; instead, they redistribute solar irradiance geographically and seasonally. The critical trigger for glaciation is not winter severity, but high-latitude northern hemisphere summer insolation. When orbital alignment minimizes summer solar radiation at 65°N, winter snowpack fails to melt during the warm season, initiating a glaciation cascade.