Winter Transport and Tidal Current in the Tsugaru Strait
Winter Transport and Tidal Current in the Tsugaru Strait
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津轻海峡的冬季运输和潮流
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
O. Togawa
中科院分区：
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作者：
M. Onishi;Y. Isoda;H. Kuroda;M. Iwahashi;Chizuru Satoh;Tomoharu Nakayama;Toshimichi Ito;Ken;Keisuke Nishizawa;S. Shima;O. Togawa
利用1999年10月29日至2000年3月31日沿着在津轻海峡一线的声学多普勒流速剖面仪（ADCP）观测资料，研究了该海峡的输运变化和潮流特征。津轻海峡连接北太平洋和日本/东海，是日本/东海对马暖流系统的主要输出通道。该断面大致在海峡中心处有较强的东北向平均流，在北海道和本州沿岸存在西南向逆流。估计的平均净向东输送，即，津轻暖流输送量为1.8Sv（Sverdrup，ISv = 106 m3 s-1）。分析了四个主要的潮汐分量，即，M2、S2、01和KI。虽然半日潮的振幅一般大于全日潮的振幅，但海峡两岸的KI和M2体积输送的振幅分别为0.72 Sv和0.52 Sv，即，昼夜潮流占主导地位。从潮量运输和潮汐之间的相位关系理解与复合的立波和入射开尔文波，从北太平洋传播到日本/东海。我们还发现了一个显著的双周振荡，它具有正压结构。日本/东海沿岸的长周期太阴潮（Mf）较强，振幅在1 ~ 3cm之间，而北太平洋的Mf潮振幅则较小，小于1cm。推测观测到的双周振荡可能是由津轻海峡两岸Mf潮振幅的差异引起的。
2 ), Abstract Transport variations and characteristics of tidal currents in the Tsugaru Strait are investigated using the ship mounted acoustic Doppler current profiler (ADCP) measurements from October 29, 1999 to March 31, 2000 along one line across the Strait. The Tsugaru Strait connects the North Pacific Ocean and Japan/East Sea, and is a main output for Tsushima Warm Current System in Japan/East Sea. The strong northeastwards mean current flows through this section approximately in the center of the Strait, and southwestward counter flows exist near both the Hokkaido and Honshu coasts. The estimated mean net eastward transport, i.e., the Tsugaru Warm Current transport, is 1.8 Sv (Sverdrup, I Sv= 10 6 m 3 s- I ). The data are analyzed four major tidal constituents, i.e., M2, S2, 01 and KI. Although the amplitudes of semi-diurnal tides are generally larger than those of diurnal tides, the amplitudes of KI and M2 volume transports across the strait are 0.72 Sv and 0.52 Sv, respectively, i.e., diurnal tidal currents are dominant. From the phase relationship between tidal volume transport and tide is understood with a composite of standing and incident Kelvin waves, which propagates from the North Pacific Ocean to the Japan/ East Sea. We also find a significant fortnightly oscillation which has a barotropic structure. The long-period lunar fortnightly (Mf) tide is more energetic along the coast faced on the Japan/East Sea with the amplitude of 1 ~3 cm, while the amplitudes for Mftide in the North Pacific Ocean are much smaller, less than 1 cm. It is inferred that observed fortnightly oscillation may be generated by the difference of Mf tide amplitude between both sides of the Tsugaru Strait.