A wave of warm water pooling in the central and eastern Pacific appears as a large area of higher-than-normal sea surface heights in this image from early November.
Published Nov 19, 2009
A trio of globes of sea surface height anomalies shows a deep pulse of warm water—a Kelvin wave—crossing the Pacific Ocean in February 2010. Kelvin waves strengthen and maintain El Niño episodes.
Published Mar 21, 2010
