منابع مشابه
A coupled-stability index for ENSO
[1] Based on the simple framework of the recharge oscillator for El Niño-Southern Oscillation (ENSO), this paper describes the formulation of a coupled stability index for the large-scale tropical ocean-atmosphere interactions in the equatorial Pacific region. This index, referred to as the Bjerknes (BJ) stability index, takes its negative contributions from the mean upwelling and thermal dampi...
متن کاملCoupled Data Assimilation for Enso Prediction∗
An outstanding problem with present ENSO forecast systems is that most of them are initialized in an uncoupled manner, that is, no feedbacks are allowed between the ocean and the atmosphere during data assimilation and model initialization. Such an approach may produce realistic initial states, but not necessarily the optimal conditions for skillful forecasts, because model-data mismatch can ca...
متن کاملMechanisms for ENSO Phase Change in a Coupled GCM
The mechanisms leading to El Niño onset and termination in the ECHAM4/OPA coupled GCM are assessed and compared to observations and existing ENSO paradigms. At the equator as well as off equator, the patterns and timing of modeled El Niño composites are in good agreement with those observed. Heat content of the west Pacific is confirmed as a precursor to ENSO phase change, and the present work ...
متن کاملAn ENSO stability analysis. Part I: results from a hybrid coupled model
In this study, we use the Bjerknes stability (BJ) index as a tool to investigate overall El Niño-Southern Oscillation (ENSO) stability in a hybrid-coupled model (HCM) with various atmosphere and ocean background states. This HCM shows that ENSO growth rates as measured by the BJ index and linear growth rates estimated directly with a time series of the Niño 3.4 indices from the coupled model si...
متن کاملCoexistence of Equatorial Coupled Modes of ENSO*
To study the regimes of leading ocean–atmosphere coupled modes of relevance to the El Niño–Southern Oscillation (ENSO) phenomenon, a comprehensive eigenmode analysis of an intermediate coupled model linearized with respect to an array of basic states is performed. Different kinds of leading modes are found to coexist and become unstable under wide ranges of basic states and parameter conditions...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2006
ISSN: 0094-8276
DOI: 10.1029/2006gl027221