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Progress in Earth and Planetary Science
Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

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. 2

Time-series panel of the δ18O component-1 and its subcomponents isolated by singular spectrum analysis. δ18O comp-1 exponential trend (‰) = 1.44194 + 2.92378 e(−t/6963.268). The vertical brown arrows show four subtrends of component-1 and their correlation to the NHG transitions known in the literature (MBO this study). To the right, the Fourier frequency spectrum of δ18O detrended comp-1 subcomp-3-11 (2.23% variance) for three time intervals are highlighted by red boxes. Note the increase in amplitude after the ONHG and MPT and the power increase of the ~ 93-kyr eccentricity cycle. x-axis scale variable (‰). The y-axis scale of the frequency spectrum increases upwards. Time scale in kyr

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