JP1.8 Multiplicity of ENSO

Monday, 13 June 2005
Riverside (Hyatt Regency Cambridge, MA)
Fei-Fei Jin, Florida State Univ., Tallahassee, FL; and L. Bejarano

El Niño and La Niña are currently understood as warm and cold phases of a natural mode of oscillation that arises as the result of the ocean and the atmosphere interaction over the tropical Pacific. A new picture for the El Niño phenomenon emerged from this study: the great variations and the broad spectrum of the El Niño and La Niña cycles in modern time result from the coexistence of at least two leading modes with periods of nearly 4-6 and 2-3 years. This multiplicity also makes the El Niño phenomenon gravely sensitive to climate state changes of either natural or anthropogenic causes.
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