Ensemble-mean dynamics of the ENSO recharge oscillator under state-dependent stochastic forcing

Details Ensemble-mean dynamics of the ENSO recharge oscillator under state-dependent stochastic forcing Ensemble-mean dynamics of the ENSO recharge oscillator under state-dependent stochastic forcing

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3403807j&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 3, CiteID L03807

Physics

Geophysics

17

Oceanography: Physical: Enso (4922), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Mathematical Geophysics: Instability Analysis

Scientific paper

In this paper, the conceptual recharge oscillator model for the El Niño-Southern Oscillation phenomenon (ENSO) is utilized to study the influence of fast variability such as that associated with westerly wind bursts (WWB) on dynamics of ENSO and predictability. The ENSO-WWB interaction is simply represented by stochastic forcing modulated by ENSO-related sea surface temperature (SST) anomalies. An analytical framework is developed to describe the ensemble-mean dynamics of ENSO under the stochastic forcing. Numerical ensemble simulations verify the main results derived from the analytical ensemble-mean theory: the state-dependent stochastic forcing enhances the instability of ENSO and its ensemble spread, generates asymmetry in the predictability of the onsets of cold and warm phases of ENSO, and leads to an ensemble-mean bias that may eventually contribute to a climate mean state bias.

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