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Difference fields over the tropical Pacific from MERRA-Ocean for December 2015 minus 1997 (top row), December 2015 minus 1982 (second row), and December 1997 minus 1982 (bottom row). The difference fields shown are SST (left column) and zonal ocean current velocity (right column). The highlighted boxes from West to East are Niño4, Niño 3.4, Niño 3, and Niño1+2.
