대마난류의 변동이 동해 심층순환의 중장주기 변동에 미치는 영향

Abstract

Watanabe et al. (2003) show that the temperature of the deep water in the northern part of East/Japan Sea (EJS) oscillates with about 15 year cycle as the volume transport of the Tsushima warm current (TWC) reported by Takikawa and Yoon (2005). Using a four-box model based on Griffies and Tziperman (1995) with an inflow and outflow system, we have investigated the roles of the external forcing on the interdecadal scale variation of the EJS thermohaline circulation. The model shows that the effect of TWC is manifested more strongly in the northern boxes where watermass formation occurs than the southern boxes, although the southern surface box is connected to TWC directly. The effect of the surface boundary conditions can be observed in all surface boxes, however. The model also shows TWC could have strong effect on the deep water mass formation rate.