Interannual Variability in Coupled Tropical Atmosphere-Ocean Models

摘要: In this study we develop a series of coupled atmosphere-ocean models to investigate the El Nino/Southern Oscillation (ENSO) phenomenon. A numerical ocean-atmosphere model system in tropical Pacific is used examine dynamic and thermodynamic processes associated with ENSO. The warm events are initiated spring prior event peak, well described as an instability system. Oceanic wave dynamics determines fate growing instability. warming sea surface temperature (SST) produces westerly wind anomalies equatorial central Pacific, forcing equatorially trapped Rossby waves that propagate freely western boundary. These reflect at boundary, sending upwelling Kelvin back basin which act terminate growth rapidly plunge into cold regime. boundary reflection necessary for termination. Of produced by event, only two gravest symmetric modes important process produce event. interannual variability not vacillation between equilibrium states. rate either or state too slow achieve equilibrium. oscillatory around single basic state.