Consider coordinating with ENVO on a definition for El Niño

[dillerm]

Information I've gathered on El Niño:

• Warm phase of the El Niño-Southern Oscillation (ENSO), which is a single "periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, affecting much of the tropics and subtropics," according to Wikipedia.
• ENSO is almost certainly an individual process, based on what I've gathered from my preliminary research, that consists of three subprocesses: 1) La Niña, 2) El Niño, and 3) a neutral phase that marks the transitions between 1) and 2), in which sea temperatures, tropical precipitation, and wind patterns approach their long-term averages.
• In addition, my initial guess is that ENSO is an instance of 'environmental system process'