Journal of Oceanography, Vol. 66 (No. 5), pp. 685-696, 2010
Yasushi Fukamachi1*, Kay I. Ohshima1, Naoto Ebuchi1, Tadao Bando2, Kazuya Ono1 and Minoru Sano3
1Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
2Soya Fishery Cooperative Society, Wakkanai 098-6755, Japan 3Wakkanai Fisheries Research Institute, Hokkaido Research Organization, Wakkanai 097-0001, Japan
(Received 15 April 2010; in revised form 6 August 2010; accepted 6 August 2010)
Abstract: Time-series data of the vertical structure of the Soya Warm Current (SWC) were obtained by a bottom-mounted acoustic Doppler current profiler (ADCP) in the middle of the Soya Strait from September 2006 to July 2008. The site of the ADCP measurement was within the coverage of the ocean-radar measurement around the strait. The volume transport of the SWC through the strait is estimated on the basis of both the vertical structure observed by the ADCP and the horizontal structure observed by the radars for the first time. The annual transport estimates are 0.62-0.67 Sv(1 Sv = 106 m3s-1). They are somewhat smaller than the difference between the previous estimates of the inflow and outflow through other straits in the Sea of Japan, and smaller than those obtained in the region downstream of the strait during 2004-05 (0.94-1.04 Sv). The difference in the two periods may be attributed to interannual variability of the SWC and/or the different measurement locations.