... Occurs every to 10 years Most recent and severe events in 1953, ‘5 7- 58, ‘65, ‘7 2- 73, ‘7 6- 77, ‘8 2- 83, ‘9 1- 92, ‘9 7- 98, ‘0 2- 04, ‘0 6- 07, ’09’10 Slides from 198 2- 83 El Niño INDEX = • Air temperature ... fish and sea birds - especially bad off Peru Animations Ocean AND Atmosphere El Niño is both an oceanic and an atmospheric phenomenon – Often called ENSO Scientists knew of SO from wind and precip ... - atmosphere and ocean - in the boundless dimensions of time and space Abnormality in one causes abnormality in the other Events such as El Niños have no definite starting point and no end It’s...