Neat animation showing the cool water anomalies ready to upwell to the surface starting in the eastern tropical Pacific, as El Niño is poised to weaken & give way to La Niña. Via climate.gov.

www.climate.gov/media/16003

That's a great animation, thank you So The Pacific is much deeper than that, do the deeper layers just stay more stable and hence can be 'ignored' from the animation?

Kelvin wave!