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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend

Fig. 3

Time-series panel of δ18O component-2 and its subcomponents and Fourier frequency spectrum of comp-2 for three time intervals a, b and c, highlighted by red-labeled boxes. Note the evident increase in comp-2 amplitude after the ONHG and MPT, and the transition in periodicity from a obliquity to c eccentricity with a gradual upwards strengthening of the short eccentricity power. Interestingly, the amplitudes of the eccentricity in comp-2 subcomp-1-4, 9-15 are increasing, whereas the amplitude of the obliquity in comp-2 subcomp-5-8 is decreasing after the MPT. x-axis scale variable (‰). The y-axis scale of the frequency spectrum increases upwards. Time scale in kyr

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