Understanding El Niño and La Niña Normal conditions: upwelling off the coast of Peru, warm water “piled up” in the Western Pacific.

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Presentation transcript:

Understanding El Niño and La Niña

Normal conditions: upwelling off the coast of Peru, warm water “piled up” in the Western Pacific

Strong upwelling

Normal conditions: upwelling off the coast of Peru, warm water “piled up” in the Western Pacific

Normal conditions

El Niño conditions: surface current reversed, pushing warm water toward the Eastern Pacific Upwelling repressed  Unusually warm water across Equatorial Pacific

El Niño conditions: surface current reversed, pushing warm water toward the Eastern Pacific Upwelling repressed  Unusually warm water across Equatorial Pacific

La Niña: Stronger trade Winds than normal, causing a strong upwelling of cold water in the Eastern Pacific

Developing La Niña after an El Niño

Declared El Niño related disasters, 1998

General: Health effects : Fisheries disruptions,,Seabirds, marine mammals:

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