Distribution of near-inertial waves in the mixed and deep layers of the East/Japan Sea from a high-resolution wind-forced ocean model

초록

We present the spatiotemporal distribution of near-inertial waves (NIWs) in the East/Japan Sea (EJS) affected by background circulations using high-resolution hourly-wind-forced dataassimilated ocean model outputs. The simulation results reveal that the kinetic energy of NIWs in the mixed layer is relatively stronger in fall and winter than in spring and summer with the strongest NIWs generated in December. Generally, wind-current resonance induces energetic NIWs in fall and winter. But, NIW energy is sometimes relatively strong in spring and summer due to strong wind-current resonances occurring even when the wind is weak. The NIW energy in the mixed layer is stronger at the northern side of subpolar front (SPF) than at the southern side. Vigorous negative relative vorticities caused by anticyclonic eddies and background circulations at the southern part of the EJS enhance the vertical penetration of NIW energy to the deep layer. This creates stronger NIWs in the deep layer defined 400?1000 m at the southern part of the EJS than at the northern part, opposite to the results in the mixed layer.