통과류의 변동성과 동해 온난화의 영향 가능성에 대하여

Abstract

A distinguished feature of the East Sea is the upper layer flow through the three major straits connected to the Pacific Ocean. Generally, East Sea Throughflow (EST) supplies the warm water through the Korea Strait and drains relatively cold water through the Tsugaru and the Soya Straits. The prominent long-term change of the East Sea is the deep water warming and the depletion of oxygen in the deep layer during the last 40 years. The cause of this phenomena explained mainly by the slow down of the deep convection in the northern region influenced by the global warming. In this study, the role of the EST transport variability on the East Sea warming has been investigated.A distinguished feature of the East Sea is the upper layer flow through the three major straits connected to the Pacific Ocean. Generally, East Sea Throughflow (EST) supplies the warm water through the Korea Strait and drains relatively cold water through the Tsugaru and the Soya Straits. The prominent long-term change of the East Sea is the deep water warming and the depletion of oxygen in the deep layer during the last 40 years. The cause of this phenomena explained mainly by the slow down of the deep convection in the northern region influenced by the global warming. In this study, the role of the EST transport variability on the East Sea warming has been investigated.To understand long-term EST transport variability, monthly mean EST transport time series extracted from the Simple Ocean Data Assimilation (SODA) data during the period of 1958 to 2001. It shows that winter time transport anomaly seems to have overall increasing trend with PDO (Pacific Decadal Oscillation) like fluctuation. It is notable that the recent winter EST transport seems to be increased and it might be related with recent East Sea warming. The relation between the EST transport variability and local/remote wind stress variability is also discussed.