HIGHLIGHTS
SUMMARY
Although less frequent than multi-year La Niña events, multi-year El Niño events are also occasionally observed in the tropical Pacific (such as the 2014/15/16 El Niño event)7,8 (Supplementary Fig 1). Despite the many hypotheses that have been proposed to explain the asymmetric duration of El Niño and La Niña (that is, La Niña tends to be more persistent than El Niño)13-18, few theories exist to account for the sources of the multi-year persistence of El Niño and . . .
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