THE NUMERICAL SIMULATION ON OCEANIC FORCING RESPONSE TO ATMOSPHERIC WIND STRESS AND THE RELATION WITH EL NIÑO

A one layer model of equivalent nonlinear shallow water has been designed. Using this model the simulation on oceanic forcing response to surface wind stress is conducted. The results showed that while the east wind intensity over east part of western Pacific Ocean are suddenly reduced and are changed to west wind, it induced to the increase of the sea surface height and the temperature on the east Pacific Ocean. The nonlinear shallow water model and the linear shallow water model successfully simulated these broad sense El Ninño events of large scape on the central-east Pacific Ocean. The simulated results also showed that the increase of height and temperature of sea surface on the east Pacific Ocean egion are related to the intensity, duration, and scape of extension of west wind on the west Pacific Ocean region, that is, the west wind on the west part of sea region is stronger, the duration is longer, the scape of extension is larger, the productive El Ninño is stronger. Moreover, the results of the linear model with the results of the nonlinear model are compared. The results showed that the nonlinear advection term can have effect on propagate velocity of wave, the propagate velocity of wave of counter basic-flow have been decreaced, but the role of nonlinear advection term on forming El Ninño events may be little.