Formation mechanism of the cold-water belt formed off the soya warm current |
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Authors: | Miho Ishizu Yujiro Kitade Masaji Matsuyama |
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Institution: | (1) Department of Ocean Science, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo 108-8477, Japan |
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Abstract: | The cold-water belt (CWB) is frequently formed off the Soya Warm Current (SWC) during summer and autumn. The detailed distribution
of the flow and temperature fields observed by the R/V Sinyo-maru in the summer of 2001 captured the structures of the SWC
and the CWB. The temperature and density distributions showed that the vertical distribution of the CWB is associated with
the upwelling formed off the SWC. Numerical experiments using a two-layer model with realistic bottom topography have been
performed to understand the formation mechanism of CWB and the upwelling structure off the current. In the experiment, the
sea level difference between the Japan Sea and the Okhotsk Sea, and baroclinic flow assuming the Tsushima Warm Current were
given along the open boundary. The numerical model well reproduces the current system of the SWC and upwelling region off
it. The upwelling region is formed at the Soya Strait first, and then it spreads on the offshore side along the SWC as a developing
current system. Analysis of the model data indicated that the geostrophic balance mainly dominates in the current system,
while convergence of the bottom Ekman transport due to the SWC forms the upwelling region as the secondary circulation. In
addition, the advection effect due to the SWC is found to strengthen the upwelling. |
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Keywords: | The Soya Warm Current upwelling two-layer model The Okhostk Sea |
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