---
title: "Southern Oscillation: Pressure See-Saw | Model Diplomat"
description: "The Southern Oscillation is the pressure see-saw in the Pacific that drives El Niño and La Niña, crucial for understanding global climate patterns."
url: "https://modeldiplomat.com/learn/glossary/southern-oscillation"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The Southern Oscillation is the see-saw of atmospheric pressure between the eastern and western tropical Pacific that drives the El Niño and La Niña climate cycle.
- What is the difference between the Southern Oscillation and El Niño?
- How is the Southern Oscillation Index calculated?
- Why does the Southern Oscillation matter for the Indian monsoon?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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In 2023 the India Meteorological Department cited a developing El Niño—the warm phase of the Southern Oscillation—in forecasting a below-normal southwest monsoon, which materialised as India recorded its driest August in over a century.

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