Editing Cromwell Current (section)

==Interaction with El Niño==
[[El Niño]] is a reversal of the normal situation in the Pacific Ocean. Surface water is blown westwards by the prevailing winds and deeper water is forced upwards to replace it. Every now and then, the surface water sloshes back across the ocean, bringing warm water temperatures along the eastern coasts of the Pacific. In non-El Niño years, the Cromwell Current is forced to the surface by underwater seamounts near the [[Galápagos Islands|Galapagos]] islands (this is called upwelling.) However, during El Nino years the current does not upwell in this way. The waters around the islands are therefore considerably warmer during El Niño years than during normal years.