Fig. S7.
Cross-wavelet coherence and phase relationship of the sea level record from ODP site 1123 (47) and other sea level records (48, 75, 76) that cover the past 800 ky. Squared wavelet coherence between two time series was computed using the methods proposed by ref. 68. This analysis identifies regions of significant (95% confidence) coherence and its relative phase in time−frequency space. The 95% confidence level against red noise was calculated using the Monte Carlo method and is shown as a thick contour that encloses the significant sections. The light shading represents the cone of influence (COI), which ensures that the edge effects are negligible beyond this point. Black arrows indicate the relative phase relationship between the two time series, with in-phase pointing right, antiphase pointing left, ODP 1123 Sea Level (47) leading a given sea level record by 90° pointing up, and ODP 1123 Sea Level lagging by 90° pointing down. The different records have been interpolated to an evenly spaced time series of 2 ky before the spectral analysis of the data. The results indicate that the coherency of the SCS FB-δ15N record with (A) the sea level stack is as strong as the coherency among (B−D) the independent sea level reconstructions.