Paleoclimate Heresy If you want to know the future, look at the past  Albert Einstein


The stochastic nature of iceage climate variations by John Reid Antarctic ice core proxy temperature variations are compared with insolation values at 60 ^{o} N for the last 500 kyr. Linear regression shows that the insolation accounts for less than 10 percent of the variance of the temperature. The temperature exhibits a power law variance spectrum with an index of 2 implying that variations are the outcome of an integrating process such as a random walk. Significant peaks occur at obliquity and precession frequencies but not at the eccentricity frequency, below which there is a significant low frequency trough or cutoff. Comparison of the GISP2 ^{10}Be flux with GISP2 temperature variations suggest that different mechanisms underlie DansgaardOeschger events, the Younger Dryas and Termination I. A model of ice age climate variations is proposed whereby the climate alternates between two metastable states. Posted: 4 January 2018 
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