Time variation of ENSO events during 1951 to 2007, Positive and negative anomalies represent warm
and cold events, respectively. ENSO index used is Nino3 index.
Time series plots of the Niño 3 (upper) and Niño 3.4
SST indices as 5-month running means using data from NOAA
and relative to a base period climatology from 1950 to 1979.
Values exceeding thresholds of ±0.5°C for Niño 3 and ±0.4°C for
The sample correlation coefficients are evaluated by two-tailed
Yearly data of rain attenuation is observed for the period of
t test. In this work, the level of significance
Niño 3.4 are stippled to indicate ENSO events.