Surface signals intensity of internal waves studied with numerical experiments

The internal waves in South China Sea (SCS) are often observed by remotely sensed satellite images, which are taken from ERS 1/2, SPOT1 to 5, Radarsat-1/2, Envisat, and Landsat. The intrusion branch of the Kuroshio (IBK) has a seasonal variation, which gives rise to a variation of the background current field. The impacts of Coriolis force and the background current on the surface signals of internal waves are presented here using three simulation experiments. The model results show that considering Coriolis force, the max abstract value of surface current gradient (MASUG) changes from 0.00087 to 0.00084, the vertical Coriolis term weakens the surface roughness; Proposing the background current equal to 0.3 m/s,, MASUG changes from 0.00084 to 0.00464, the background current increases the propagating speed of the solitary depression wave, and away from the right of the ridge, the surface current gradient becomes stronger.