Figure 3.

(a) Local daily tide data (grey line) from Malakal A (1926–1939) and Malakal B (1969–2015) fitted with linear regression (orange line), showing a 2.87 mm increase per year since 1969 in the Malakal B time series; dotted black line is the mean for each time period. (b) Tide data from Malakal B showing monthly averages (grey line), annual averages (red points) and long-term increase above the 1969–2015 average indicated by the significant cubic fit (red curve ± 95% CIs); double-headed red line shows recent difference in tidal height from average, the red-dashed vertical line signifies the approximate timing of the onset of Porites vertical extension. (c) Tide data from Malakal B showing monthly averages (grey line), annual mean low water spring tide height (blue points) and long-term increase in mean low water spring tide height above the 1969–2015 average (thick dashed black line) indicated by the significant quadratic fit (blue line ± 95% CIs); double-headed blue line shows recent accommodation space, the blue dashed vertical line signifies the approximate timing of the onset of Porites vertical extension.