|Latitude: 18° 29' S||Longitude: 70° 19' W|
Next a table that sums up the values of the Sea Surface Temperature (SST), minimum, maximum and monthly for every month of the year selected. Additionally, the historic average of the SST is included, which can be used as a standard reference value for every month. .
|MES||TSM (ºC) mínima||TSM (ºC) máxima||TSM (ºC) Promedio mensual||TSM (ºC) Promedio histórico|
* This historic average was calculated based on a data base of the last 20 years (1980 – 2000).
Graph of anomaly values of SST associated to the El Niño/ La Niña Event, since 1950 to date
To interpret the Sea Surface Temperature (SST) based on the global phenomena “El Niño” (warm event) or “La Niña” (cold event), a “monthly anomaly” is calculated and it is the result of the difference between the observed and historic values. This value is contrasted against the Oceanic Nino Index (ONI), which has become the standard used by the NOAA to identify episodes of El Niño and La Niña in the tropical Pacific. This index corresponds to a measurement of 3 months of the SST anomaly for the Region Niño 3.4, located between the 5°N - 5°S and 120 – 170°W. The events are defined as 5 periods of 3 consecutive months of anomaly values above 0.5°C for warm events (El Niño) and on or under the anomaly -0.5°C for cold events (La Niña). The threshold is divided in Weak (with an anomaly of 0.5 to 0.9°C), Moderate (1.0 to 1.4°C), Strong (1.5 to 1.9°C) and Very Strong (≥2.0°C).
Image: Monthly discrepancies of SST for the Arica Station.