Geosciences Research

Download PDF (342.5 KB) PP. 22 - 26 Pub. Date: February 10, 2017

DOI: 10.22606/gr.2017.21004

• Viacheslav. A. Bezverkhnii^*
  Laboratory of Geophysical Fluid Dynamics, A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia

Spectral and wavelet analysis reveal the chain of close phase and coherence relationships at the obliquity frequency in variations of the tilt of the Earth’s rotational axis (obliquity), frequency of large volcanic eruptions (E_f) along the Pacific Ring of Fire, and climate characteristics, represented by the relative content of oxygen-18 (δ¹⁸O) in the calcite of fossil benthic foraminifers (prominent LR04 stack), Antarctic and Greenland ice core data. The links revealed show that powerful 41,000-year rhythms in the Plio-Pleistocene climate variations can be caused by geophysical and geochemical effects of global volcanic activity which is induced by the forced obliquity oscillations.

The Earth's obliquity, volcanic activity, stable isotopes, climate; wavelet, spectral analysis.

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