Pacific basin under El Niño conditions Figure 4.2a 4.3 ENSO mechanisms I: Extreme phases Warmer SST in east; rainfall tends to spread east Trade winds weaken Unbalanced eastward PGF in ocean anomalous currents (in vert avg through layer above thermocline) thermocline deepens in east Upwelling brings up water less cold than normal Neelin, 2011.
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