FIGURE 4 | First year of occurrence of permanent MHW states. (A) The year of the first permanent MHW state, i.e., a full year of MHW days, from the RCP8.5 experiment. (B) The proportion of the global ocean grid cells experiencing a permanent MHW state over the 21st century according to the RCP4.5 (brown line) and RCP8.5 (red line) emissions scenarios. The shaded regions indicate the minimum and maximum values based on individual ensemble members.