Nonlinear and chaotic ice ages: data vs speculations

TL;DR

This paper analyzes Antarctic ice core and deep sea proxy data to reveal nonlinear, chaotic, and resonance phenomena in ice age climate fluctuations, emphasizing the influence of Earth precession and galactic turbulence.

Contribution

It demonstrates the dominance of subharmonic resonance in temperature fluctuations and provides evidence of chaotic atmospheric CO2 response to obliquity forcing.

Findings

Temperature fluctuations show one-third subharmonic resonance.

Chaotic response of atmospheric CO2 to obliquity forcing is observed.

Galactic turbulence may influence climate variability.

Abstract

It is shown that, the wavelet regression detrended fluctuations of the reconstructed temperature for the past 400,000 years (Antarctic ice cores data) are completely dominated by one-third subharmonic resonance, presumably related to Earth precession effect on the energy that the intertropical regions receive from the Sun. Effects of Galactic turbulence on the temperature fluctuations are also discussed. Direct evidence of chaotic response of the atmospheric CO_2 dynamics to obliquity periodic forcing has been found in a reconstruction of atmospheric CO_2 data (deep sea proxies), for the past 650,000 years.