The Optimally Interpolated SST (OISST) is generated from both in situ and satellite data including AVHRR infrared satellite SST data and AMSR data using the optimum interpolation method. The OISST product is best used for short time scale applications.
The differences in the purpose and construction these operational SST products are significant and will be emphasized. ERSST is a 2 degree monthly dataset while the OISST is 0.25 degree daily dataset. The ERSST version 3b uses in situ data only while the OISST incorporates both in situ and satellite data. Due to the differences in their input data and spatial-temporal resolution, the two datasets have different advantages and disadvantages in their application to climate change studies. In this presentation, we will compare the two datasets and contrast their application to phenomena of varying temporal and spatial scales.