We calculated three metrics of thermal
history: (1) the mean of the
annual maximum DHW from 1985 — 2003 (2) the proportion of years from 1985 to 2003 in which the maximum DHW exceeded 4 °C · week, and (3) a year - to - year
temperature variability metric from [16], [46], which is the standard deviation of the maximum monthly SST from 1985 — 2000 scaled such that the mean for the world's coral reefs is 1 °C.