El Niño–Southern Oscillation

The El Niño–Southern Oscillation (ENSO) is a climate pattern that describes the periodic fluctuations in sea surface temperatures and atmospheric conditions in the central and eastern tropical Pacific Ocean. ENSO has three phases: 1. **El Niño**: This phase is characterized by warmer-than-average sea surface temperatures in the central and eastern Pacific. It tends to occur every 2 to 7 years and can last several months to a couple of years.