National Oceanic and Atmospheric Administration
https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html

National Oceanic and Atmospheric Administration
https://psl.noaa.gov/data/gridded/data.noaa.ersst.v5.html

National Oceanic and Atmospheric Administration
https://psl.noaa.gov/data/timeseries/monthly/PMM/pmmsst.data