TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 62 (No. 4), pp. 527-538, 2006

Structure of the Tsushima Warm Current in the Northeastern Japan Sea

Tatsuro Watanabe*, Osamu Katoh and Haruya Yamada

Japan Sea National Fisheries Research Institute, Fisheries Research Agency,Suido-cho, Niigata 951-8121, Japan

(Received 6 June 2005; in revised form 10 April 2006; accepted 10 April 2006)

Abstract: By using Acoustic Doppler Current Profiler (ADCP) measurements with the four round-trips method to remove diurnal/semidiurnal tidal currents, the detailed current structure and volume transport of the Tsushima Warm Current (TWC) along the northwestern Japanese coast in the northeastern Japan Sea were examined in the period September-October 2000. The volume transport of the First Branch of the TWC (FBTWC) east of the Noto Peninsula was estimated as approximately 1.0 Sv (106 m3/s), and the FBTWC continued to flow along the Honshu Island to the south of the Oga Peninsula. To the north of the Oga Peninsula, the Second Branch of Tsushima Warm Current and the eastward current established by the subarctic front were recombined with the FBTWC and the total volume transport increased to 1.9 Sv. The water properties at each ADCP line strongly suggested that most of the upper portion of the TWC with high temperature and low salinity flowed out to the North Pacific as the Tsugaru Warm Current. In the north of the Tsugaru Strait, the volume transport of the northward current was observed to be as almost 1 Sv. However, the component of the TWC water was small (approximately 0.3 Sv).

*Corresponding author E-mail: tatsuro@fra.affrc.go.jp

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