Assessment and Intercomparison of NOAA Daily Optimum Interpolation Sea Surface Temperature (DOISST) Version 2.1

Abstract The NOAA Daily Optimum Interpolation Sea Surface Temperature dataset (DOISST) has recently been updated to v2.1 (January 2016–present). Its accuracy may impact the climate assessment, monitoring and prediction, environment-related applications. performance, together with those of seven other well-known sea surface temperature (SST) products, is assessed by comparison buoy Argo observations in global oceans on daily 0.25° × resolution from January 2016 June 2020. These SST products are NASA MUR25, GHRSST GMPE, BoM GAMSSA, UKMO OSTIA, GPB, ESA CCI, CMC. Our assessments indicate that biases root-mean-square difference (RMSDs) reference all buoys floats low DOISST. bias independent 10% SSTs remains DOISST, but RMSD slightly higher DOISST than OSTIA CMC, GMPE; also, RMSDs GMPE similar CCI whether they compared against buoys, Argo, or observations, while smaller observations. features a good performance among eight which benefit ingesting expanding regional spatial coverage situ for effective correction satellite data.