False-color map of the equatorial Pacific Ocean showing sea level variations in millimeters, with blue and purple indicating lower sea levels and red and white indicating higher sea levels appearing along the Equator, suggesting the passage of a Kelvin wave and early El Nino development in 2023.

Satellite measurements of sea level data taken in 2023 show the passage of Kelvin waves, low waves that can be tens of miles (hundreds of kilometers) wide, moving from west to east along the equator toward the west coast of Ecuador.

Name: Satellite measurements of sea level data taken in 2023 show the passage of Kelvin waves, low waves that can be tens of miles (hundreds of kilometers) wide, moving from west to east along the equator toward the west coast of Ecuador.
Uploaded: 2026-10-14T14:19:48Z
Duration: 4 s
Description: Kelvin wave data collected by a U.S.-European satellite in 2023 shows signs of early El Niño development in the equatorial Pacific Ocean.

Kelvin wave data collected by a U.S.-European satellite in 2023 shows signs of early El Niño development in the equatorial Pacific Ocean.

NASA/JPL-Caltech

© MinutePhysics (A Britannica Publishing Partner)

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Satellite measurements of sea level data taken in 2023 show the passage of Kelvin waves, low waves that can be tens of miles (hundreds of kilometers) wide, moving from west to east along the equator toward the west coast of Ecuador.

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