The Current Structure of the Tsushima Warm Current along the Japanese Coast

The Current Structure of the Tsushima Warm Current along the Japanese Coast
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日本沿岸对马暖流的当前结构

DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
W. Koterayama
W. Koterayama
中科院分区：
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文献类型：
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作者：
H. Hase;J. Yoon;W. Koterayama

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根据1995-1998年初夏在若狭湾附近进行的密集ADCP和CTD测量，分析100 m深度的温度分布和表面漂流物的轨迹，研究了对马暖流（TWC）沿着日本海岸的分支（石井和Yoshida，1996; Lee等人，1997年）。TWC的第一个分支（FBTWC）全年存在。它起源于对马海峡的东部海峡，沿着日本沿岸浅于200米的等深线流动，并通过津轻海峡流出。流经对马海峡西槽的海流为春季至秋季发育的TWC第二分支（SBTWC）提供补给。SBTWC的发展伴随着大陆架断裂以约7 cm sec-1的速度从对马海峡向诺托半岛传播，具有很强的斜压性。然而，SBTWC并不总是在陆架坡折附近发现，因为它的路径受到涡旋发展的影响。它的结论是SBTWC是一个地形导向电流，目前引导的大陆架断裂。1995-1998年期间，在陆架区域150 m和300 m深度之间的西南次表层逆流（SWSCC）是中间深度的显著特征，其速度超过约5 cm sec-1，尽管ADCP数据和地转流之间观察到速度及其位置的差异。
The branching of the Tsushima Warm Current (TWC) along the Japanese coast is studied based upon intensive ADCP and CTD measurements conducted off the Wakasa Bay in every early summer of 1995–1998, the analysis of the temperature distribution at 100 m depth and the tracks of the surface drifters (Ishii and Michida, 1996; Lee et al., 1997). The first branch of TWC (FBTWC) exists throughout the year. It starts from the eastern channel of the Tsushima Straits, flows along the isobath shallower than 200 m along the Japanese coast and flows out through the Tsugaru Strait. The current flowing through the western channel of the Tsushima Straits feeds the second branch of TWC (SBTWC) which develops from spring to fall. The development of SBTWC propagates from the Tsushima Straits to Noto Peninsula at a speed of about 7 cm sec−1 following the continental shelf break with a strong baroclinicity. However, SBTWC cannot be always found around the shelf break because its path is influenced by the development of eddies. It is concluded that SBTWC is a topographically steered current; a current steered by the continental shelf break. Salient features at intermediate depth are the southwestward subsurface counter current (SWSCC) between 150 m and 300 m depths over the shelf region in 1995–1998 with the velocity exceeding about 5 cm sec−1, although discrepancies of the velocity and its location are observed between the ADCP data and the geostrophic currents.