title: El Nino on the Devil's Staircase: Annual Subharmonic Steps to Chaos.
abstract: The source of irregularity in El Niño, the large interannual climate variation of the Pacific ocean-atmosphere system, has remained elusive. Results from an El Niño model exhibit transition to chaos through a series of frequency-locked steps created by nonlinear resonance with the Earth's annual cycle. The overlapping of these resonances leads to the chaotic behavior. This transition scenario explains a number of climate model results and produces spectral characteristics consistent with currently available data.
authors.forename: F F
authors.initials: FF
authors.lastname: Jin
authors.forename: J D
authors.initials: JD
authors.lastname: Neelin
authors.forename: M
authors.initials: M
authors.lastname: Ghil