Defining ENSO Events Form DJF seasonal anomalies of NIÑO3 TAS and SOI Standardize the two time series If Standardized NIÑO3 anomaly 0.6 AND Standard SOI -0.6 If Standardized NIÑO3 anomaly -0.6 AND Standardized SOI 0.6 Warm EventCold Event From AchutaRao & Spreber (2002, 2006)
Cold Tongue El Niño (EP) and Warm Pool El Niño (WP) EP events = Standardized SONDJF NINO3 SST anomaly > 1 and should be grater than Standardized NINO4 anomaly. WP events = Standardized SONDJF NINO4 SST anomaly > 1 and should be grater than Standardized NINO3 anomaly. Kug et. al, J. Climate, 2009
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