Tropical Pacific basin-wide adjustment and oceanic waves

This study examines the basin-wide adjustment process associated with El Ni no-Southern Oscillation (ENSO) in terms of oceanic waves using the Cane-Zeb iak model. The Rossby waves induce not only the meridional mass divergence in the ocean interior but also the incoming zonal mass flux at the western boundary, which generally overcompensates the interior meridional divergenc e. Therefore, the Rossby waves alone cannot make a negative feedback. Howev er, the outgoing zonal mass flux associated with the reflected Kelvin wave at the western boundary reduces the incoming boundary mass flux associated with the Rossby waves, resulting in the tendency of equatorial basin-wide h eat content varying in phase with the meridional divergence. Also shown is that the nonequilibrium adjustment of the tropical Pacific Ocean is mainly due to the free Kelvin waves reflected at the western boundary.