For the statistical analyses, all records were linearly interpolated to produce evenly spaced time series at intervals of 30 years and subsequently detrended and high-pass–filtered to remove frequencies higher than 1/100 years and thus reduce the noise (fig. S4). Cross-correlations were calculated using the R-Studio software and the package “stats”. The stadial-interstadial tuning points used for the age model were based on change points determined for the original (unsmoothed) records of δ18O in NGRIP and ARM and near-surface temperature in MD99-2284, using the R-Studio software and the “bcp” package (55).

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