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Introduction

The connection between Earth’s oceans and atmosphere has a direct impact on the weather and climate conditions we experience. El Niño and La Niña, together called the El Niño Southern Oscillation (ENSO), are periodic departures from expected sea surface temperatures (SSTs) in the equatorial Pacific Ocean. These warmer or cooler than normal ocean temperatures can affect weather patterns around the world by influencing high and low pressure systems, winds, and precipitation. ENSO may bring much needed moisture to a region while causing extremes of too much or too little water in others.

Understanding the processes driving these types of interactions is a key component in improving forecasts and warnings. The NOAA Physical Sciences Laboratory studies multiple aspects of ENSO including its precursors, prediction, diversity, and climate and ecosystem impacts. This information can help keep communities safe and guide decisions related to issues such as water management, emergency planning, and ecosystem resilience.

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More detailed information about ENSO can be found on the ENSO-101 tab.