Extended Data Fig. 3: Spatial patterns of linear trend in the annual SST for different datasets from the 1971 to 2010.
From: Increasing ocean stratification over the past half-century

a is the observational mean based on three independent SST products, including ERSST, COBE2, and HadSST3, b is IAP, c is EN4, and d is NCEI data. The stippled areas in a–d denote the signals significant at 90% confidence level.