scholarly journals El Niño-Southern Oscillation-related ocean-atmosphere coupling in the western equatorial Pacific

1998 ◽  
Vol 103 (C9) ◽  
pp. 18635-18648 ◽  
Author(s):  
D. A. Mayer ◽  
R. H. Weisberg
Keyword(s):  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
Equatorial Pacific ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Ocean Atmosphere ◽  
Western Equatorial Pacific

scholarly journals Fokker–Planck dynamics of the El Niño-Southern Oscillation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Soon-Il An ◽  
Soong-Ki Kim ◽  
Axel Timmermann
Keyword(s):  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
Planck Equation ◽  
Equatorial Pacific ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Thermocline Depth ◽  
Stationary Mode ◽  
Fokker Planck

Abstract The asymmetric nature of the El Niño-Southern Oscillation (ENSO) is explored by using a probabilistic model (PROM) for ENSO. Based on a Fokker–Planck Equation (FPE), PROM describes the dynamics of a nonlinear stochastic ENSO recharge oscillator model for eastern equatorial Pacific temperature anomalies and equatorial Pacific basin-averaged thermocline depth changes. Eigen analyses of PROM provide new insights into the stationary and oscillatory solutions of the stochastic dynamical system. The first probabilistic eigenmode represents a stationary mode, which exhibits the asymmetric features of ENSO, in case deterministic nonlinearities or multiplicative noises are included. The second mode is linked to the oscillatory nature of ENSO and represents a cyclic asymmetric probability distribution, which emerges from the key dynamical processes. Other eigenmodes are associated with the temporal evolution of higher order statistical moments of the ENSO system. The model solutions demonstrate that the deterministic nonlinearity plays a stronger role in establishing the observed asymmetry of ENSO as compared to the multiplicative stochastic part.

A simple ocean-atmosphere coupled model for the origin of a warm El Niño Southern Oscillation event

1989 ◽  
Vol 329 (1604) ◽  
pp. 225-236 ◽  
Keyword(s):  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
Asian Summer Monsoon ◽  
Coupled Model ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Quasi Biennial Oscillation ◽  
Mature Phase ◽  
Ocean Atmosphere

A simple ocean-atmosphere coupled model is developed to investigate the evolution of a warm El Niño event in the tropical Pacific Ocean. In the absence of climatological winds the model readily evolves a realistic eastward-propagating structure provided that warm sea surface temperature (sst) covers the entire equatorial ocean uniformly. The final state of the model is similar to the mature phase of El Niño. In the presence of realistic climatological winds, however, the model behaves in a different way. It remains in a cold La Nina phase without showing any significant eastward propagation of an air-sea coupled coherent structure. Based on these model results and recent data analyses on the tropospheric quasi-biennial oscillation, it is argued that the Asian summer monsoon before and after the warm phase of El Niño Southern Oscillation is possible.

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