Figure 8.8. Annual mean, zonally averaged SST error, simulated minus observed climatology. The Hadley Centre Sea Ice and Sea Surface Temperature (HadISST; Rayner et al., 2003) observational climatology for 1980 to 1999 is the reference used here, and the model results are for the same period in the 20th-century simulations in the MMD at PCMDI. In the presence of sea ice, the SST is assumed to be at the freezing point of seawater. The legend identifying individual models appears in Figure 8.4.