OI SST (Optimum Interpolation Sea Surface Temperature) V2.1 NOAA Physical Sciences Laboratory, Boulder, Colorado, USA note: OI SST data is preliminary if fresher than two weeks and may change OSTIA (Operational Sea Surface Temperature and Sea Ice Analysis) UK Met Office + GHRSST + CMEMS (E.U. Copernicus Marine Service Information) RTGSST (Real Time Global Sea Surface Temperature) MMAB / EMC / NCEP