Supplemental Figure 1. Cross-correlation matrix of HADISST observed linearly-detrended filtered climate pattern time series. All possible cross-correlations between each of the three EOF modes in each basin are shown. From left to right: NA-EOF1, NA-EOF2, and NA-EOF3. From top to bottom: NP-EOF1, NP-EOF2, and NP-EOF3. Black lines represent statistical significance thresholds generated using the peak test, while green lines represent the cross-correlations for the corresponding modes. Lags correspond to the NA (NP) mode leading for positive (negative) lags.