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CTD measurements were made during 23-24 July 1986 around Okinoshima, an isolated small island in the Tsushima Strait, where the semidiurnal and diurnal tidal currents in the southwest-northeast direct...ion are superposed on the Tsushima Current flowing northeastward steadily. The purpose of the measurements was to clarify the mechanism of a daily decrease in water temperature in a fishing port located on the south coast of the island ; this temperature decrease had been found by Takahashi et al. (1986). The results of the measurements, in conjunction with the related long-term data by Takahashi et al. (1986) and Mizuno et al. (1986), support an interpretation that the temperature decrease is caused by the intrusion of a cold water mass into the fishing port ; the cold water mass upwells on the northeast side of the island when the northeastward current is strong, and then intrudes into the port when the current is reversed to flow southwestward weakly続きを見る
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