The COBE data set is a spatially complete, interpolated 1°x1° SST product for 1891 to present. It combines SSTs from ICOADS release 2.0, the Japanese Kobe collection, and reports from ships and buoys. Data are gridded using optimal interpolation. As in HadISST, data up to 1941 were bias-adjusted using the "bucket correction." Prior to the interpolation analyses, data were also subject to quality control using a-priori thresholds, and nearby observations were combined. COBE data have been used in the JRA Reanalyses and for AMIP experiments.
National Center for Atmospheric Research Staff (Eds). Last modified 24 Feb 2017. "The Climate Data Guide: SST data: COBE: Centennial in situ Observation-Based Estimates." Retrieved from https://climatedataguide.ucar.edu/climate-data/sst-data-cobe-centennial-situ-observation-based-estimates.