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Progress in Earth and Planetary Science
Fig. 9 | Progress in Earth and Planetary Science

Fig. 9

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. 9

Plots of the 95% confidence interval for the mean of a δ18O components and c SST components compared to orbital forcings (Laskar et al. 1993), binned at 532-kyr constant time intervals. Overlapped histograms of b Plio-Pleistocene δ18O and d SST orbital component-2-11 vs. trend component-1 subcomp-1. The averages of the astronomical components oscillate around the standardized mean with little statistically significance differences and a roughly normal distribution. Instead, the averages of the trend components differ very significantly, deviating markedly from the mean with a general multimodal distribution. Data standardized on the entire Plio-Pleistocene record (mean = 0, standard deviation = 1) and, where necessary, inverted to have the same paleoclimatic polarity (positive values for positive forcing and warming)

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