Answer:
The calming down of trade winds in the Pacific, which leads to the buildup of warm water
Step-by-step explanation:
El Niño is the climate condition that occurs when the top part of the Pacific Ocean comes in contact with the atmosphere above it. It causes the water of the Pacific Ocean to become warmer because the trade winds are becoming more calmer.
El Niño is warm stage or period of the El Niño-Southern Oscillation.
The effects of El Niño on the environment includes; flooding,severe drought, break out of fire incidents, heat stress e.t.c