EKWC, western branch of TC north of the Tsushima/Korea Strait, acts as a western boundary current and has a strong seasonal variability. At 37N, the EKWC v-velocity component, which is practically the direction of the current on that position, varies from 0.30 m/s in winter to 0.42 m/s in summer (Fig. 5). The width of EKWC is around 60 km all year round. However, the depth is around 1,400 m in the summer and 800 m in the winter.