Figure 1: Spectra and β values by proxy type and as a function of timescale. Estimated Power Spectral Density for a purely white noise input climate signal, leaving the effects of the proxy system only. Each PSM was forced with white noise climate input 10,000 times. The median spectrum is shown as the solid line, and shading represents the 95% confidence interval. a. Ice Core δ18O, b. Carbonates (Coral and Speleothem δ18O) c. TRW, Tree Ring Cellulose δ18O.
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