TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 64 (No. 3), pp. 385-392, 2008

Volume Transport of the Soya Warm Current Revealed by Bottom-Mounted ADCP and Ocean-Radar Measurement

Yasushi Fukamachi1*, Iori Tanaka2, Kay I. Ohshima1, Naoto Ebuchi1, Genta Mizuta3, Hideo Yoshida2, Shiro Takayanagi4 and Masaaki Wakatsuchi1

1Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
2Hokkaido Central Fisheries Experiment Station, Yoichi 946-8555, Japan
3Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
4Hokkaido Wakkanai Fisheries Experiment Station, Wakkanai 097-0001, Japan

(Received 14 August 2007; in revised form 15 November 2007; accepted 22 January 2008)

Abstract: The vertical structure of the Soya Warm Current (SWC) was observed by a bottom-mounted acoustic Doppler current profiler (ADCP) in the region of the SWC axis near the Soya Strait during a 1-year period from May 2004. The ADCP data revealed a marked seasonal variability in the vertical structure, with positive (negative) vertical shear in summer and fall (winter and spring). The volume transport of the SWC is estimated on the basis of both the vertical structure observed by the ADCP and horizontal structure observed by the ocean radars near the strait. The transport estimates have a minimum in winter and a maximum in fall, with the yearly-averaged values in the range of 0.94-1.04 Sv (1 Sv = 106 m3 s-1). These lie within a reasonable range in comparison to those through other straits in the Japan Sea.

*Corresponding author E-mail: yasuf@lowtem.hokudai.ac.jp

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