---
title: 'What is El Niño?'
source: 'https://youtube.com/watch?v=N2FOxjtv5ns'
video_id: 'N2FOxjtv5ns'
date: 2026-08-28
duration_sec: 60
channel: 'Kurzgesagt – In a Nutshell'
---

# What is El Niño?

> Source: [What is El Niño?](https://youtube.com/watch?v=N2FOxjtv5ns)

## Summary

This video explains the phenomenon of El Niño, focusing on its causes, effects, and the role of climate change. It breaks down the mechanics of trade winds and ocean temperature changes, and highlights the global consequences of El Niño events.

### Key Points

- **Understanding Trade Winds** [00:03] — Trade winds blow east to west in the Pacific Ocean, transporting warm surface water westward and allowing subsurface water to flow towards South America.
- **The 'Uno Reverse' Effect** [00:17] — Every 2-7 years, the Pacific reverses this pattern due to a complex interplay between atmospheric pressure and ocean surface temperature, causing warm water to slosh back to the eastern Pacific.
- **Defining El Niño** [00:30] — An El Niño event is declared when the average local sea surface temperature changes by more than 0.5°C.
- **Regional Impacts** [00:30] — In South America, El Niño brings warmer ocean water and heavy rains, while Asia and Oceania face an increased risk of droughts.
- **Climate Change Connection** [00:43] — Ocean surface temperatures have already risen 0.9°C since pre-industrial times. El Niño adds more surface heat, reducing the ocean's ability to absorb CO2, which is bad news for the planet.

### Conclusion

El Niño is a natural climate cycle with significant regional impacts, but its effects are amplified by climate change, creating a feedback loop that could worsen global warming.

## Transcript

do we need to keep an eye on it? First, we need to understand trade winds. They east to west. In the Pacific Ocean, they help transport warm surface water to subsurface water to flow towards South [music] America. But every two to seven
years, the Pacific plays a Uno reverse card. As a result of a complex interplay between atmospheric pressure and ocean surface temperature, the trade winds warm water sloshes back to the eastern Pacific. If the average temperature of
the local sea surface changes by more than 0.5° C, it's called an El Nino event. In South America, El Nino leads to warmer ocean water and heavy rains, while Asia and Oceania experience an increased [music] risk of droughts. Due
to climate change, ocean surface temperatures have already risen 0.9° C since pre-industrial times. With El Nino adding even more surface heat, the worse, eventually reducing the ocean's ability to absorb CO2. Bad news for an
ability to absorb CO2. Bad news for an already warming planet.