2.5 The indicators used in the study of ENSO is Sec Surface Temperature (SST)
El Nino/Southern Oscillation (ENSO) is the variance of the climate caused by the interaction between the ocean and atmosphere in the equatorial belt. Which, the position is associated with changes in sea surface temperature anomalies. The mass of warm water moving along the equatorial Pacific Sovereign area leads to two South American coast. For this reason, it tries to find an indicator or a tell that watching the malfunction of ENSO. The indicators used to measure the anomaly of the ENSO has several , such as Oceanic Nino Index (ONI), Multivariate ENSO Index (MEI), Japan Meteorological Agency Sea Surface Temperature Index (JMA SST Index) , The Southern Oscillation Index (SOI), and Outgoing Long Wave Radiation (OLR) etc. The details are shown in Table.
In this study, using indicators Oceanic Nino Index (ONI). The ONI is an index calculated from the sea surface temperature (SST) changes from the normal sea temperatures. By ONI values are calculated from the area called the Niño 3.0 index during the region 5°North to5°South ,150°West-90°West and the Niño 3.4 region during 5°N to 5°S, and 170°W to 120°W. And this value to NOAA has used as an index to predict the occurrence of ENSO phenomenon and evaluate the strength of the spectacle.