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Difference fields in sea surface salinity (SSS) (shaded) over the tropical Pacific from MERRA-Ocean for DJF 2015 minus 1997 (top row), DJF 2015 minus 1982 (second row), and DJF 1997 minus 1982 (bottom row). Contoured is the same as SSS but for precipitation minus evaporation from MERRA-2.
