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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

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. 8

Time-series panel of the ODP Site 846 SST obliquity’s component-3-4 (4.5% var.) and component-2 subcomp-9-10 (0.27% var.). Fourier frequency spectrum of comp-3-4 by three time intervals highlighted by red labeled boxes. The spectrum is always dominated by obliquity 41-kyr power. Note a clear increase in the average 41-kyr amplitude and power towards the beginning of the MPT (box 8a and 8b), followed by a clear decrease in amplitude after the beginning of the MPT (box 8c and comp-2 subcomp-9-10). The envelope of two to three obliquity cycles in a weak eccentricity ~ 93-kyr framework after the beginning of the MPT is less evident (box 8c and magnified time series to the right). FFS scale power increasing from a to b and was constant from b to c. x-axis scale variable (°C). Timescale in kyr

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