A structure of the Kuroshio and its related upwelling on the East China Sea shelf slope |
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| Authors: | Toshimichi Ito Arata Kaneko Hirohito Furukawa Noriaki Gohda Wataru Koterayama |
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| Institution: | (1) Graduate School of Biosphere Sciences, Hiroshima University, 724 Higashi-Hiroshima, Japan;(2) Present address: Faculty of Engineering, Hiroshima University, 724 Higashi-Hiroshima, Japan;(3) Faculty of Engineering, Hiroshima Institute of Technology, 731-51 Hiroshima, Saeki-ku, Japan;(4) Research Institute for Applied Mechanics, Kyushu University, 816 Kasuga, Japan;(5) Present address: Department of Managerial Information Science, Kure Womens College, 2-10-3 Agaminami, 737 Kure, Japan |
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| Abstract: | The ADCP on an advanced towed fish with controllable main and tail wings, called DRAKE measured a detailed sectional structure of the Kuroshio flowing to the NE along the East China Sea shelf slope west of Okinawa. At the observation period, a countercurrent directed to the SW formed in near-bottom water on the shelf slope. The horizontal flow perpendicular to the stream axis of the Kuroshio constructed a convergence zone around the boundary between the Kuroshio and the countercurrent. An intensive upwelling with the maximum velocity of 2.8 cm s–1 was found to distribute on the shelf slope around the convergence zone. A dynamic cause of this intensive upwelling is discussed carefully. |
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