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Volume transport of the Soya Warm Current revealed by bottom-mounted ADCP and ocean-radar measurement |
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| Authors: | Yasushi Fukamachi Iori Tanaka Kay I. Ohshima Naoto Ebuchi Genta Mizuta Hideo Yoshida Shiro Takayanagi Masaaki Wakatsuchi |
| Affiliation: | (1) Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;(2) Hokkaido Central Fisheries Experiment Station, Yoichi 946-8555, Japan;(3) Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan;(4) Hokkaido Wakkanai Fisheries Experiment Station, Wakkanai 097-0001, Japan |
| 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. |
| Keywords: | Soya Warm Current volume transport acoustic Doppler current profiler ocean radar seasonal variability |
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