Fig. 5: Time-lagged correlation between the SST-PC1 and Niño 3.4 index.
From: Predictable equatorial Atlantic variability from atmospheric convection-ocean coupling

The SST-PC1 leads at positive lags, whereas the Niño 3.4 index leads at negative lags. The gray vertical bar denotes the Atlantic Niño year (0). Negative lag denotes the preceding year (−1), and positive lags the following year (+1). Circular ticks denote statistical significance at the 95% confidence level. Colored curves indicate predictions by C3S.