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Impact of dynamical and stochastic processes on the predictability of ENSO
Author(s) -
Flügel Moritz,
Chang Ping
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl01959
Subject(s) - predictability , forcing (mathematics) , chaotic , statistical physics , climatology , nonlinear system , el niño southern oscillation , range (aeronautics) , coupling (piping) , environmental science , stochastic modelling , physics , atmospheric sciences , meteorology , geology , mathematics , computer science , statistics , materials science , quantum mechanics , artificial intelligence , metallurgy , composite material
Large ensembles of prediction experiments were conducted using a coupled ocean‐atmosphere model consisting of a reduced gravity ocean and a simple atmospheric feedback model. By varying the coupling strength we maneuver the system through a wide range of dynamical regimes, i.e., stable, unstable and chaotic regimes, in the presence of various stochastic forcing. The analysis of the time evolution of the ensembles suggests that the stochastic forcing has a considerably larger impact on ENSO predictions on short lead times up to about nine months than the nonlinear dynamics. However, at longer lead times the effect of chaotic dynamics is reflected in the time evolution of the ensembles.