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Ed Harrison and Sim Larkin have been working to detail the lifecycles of El Niño and La Niña events since the mid-1990s. This work has resulted in the first description of the statistically significant weather impacts of El Niño and La Niña events, the first description of the robust lifecycles of El Niño, La Niña, and their assymetries, and discussion of the importance of the exact definition of El Niño and La Niña to their usefulness.

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