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Holocene history of ENSO variance and asymmetry in the eastern tropical Pacific

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Science  29 Aug 2014:
Vol. 345, Issue 6200, pp. 1045-1048
DOI: 10.1126/science.1252220

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El Niño shifted between the center and the East

El Niño has changed quite a bit over the past 10,000 years. During some periods it was less variable than now, and during others it shifted from its current locale toward the central Pacific. Carré et al. analyzed the shells of mollusks from Peru to construct a record of the El Niño–Southern Oscillation (ENSO) in the eastern Pacific over the Holocene period. They compared this record with other records from the rest of the Pacific to reveal how much the strength and frequency of El Niños changed and how their positions varied.

Science, this issue p. 1045