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Large ageostrophic currents in the abyssal layer southeast of Kyushu, Japan, by direct measurement of LADCP |
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| Authors: | Akira Nagano Kaoru Ichikawa Hiroshi Ichikawa Yasushi Yoshikawa Kiyoshi Murakami |
| Institution: | 1. Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan 2. Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan 3. Mutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology, Mutsu, Japan 4. Global Environment Marine Department, Japan Meteorological Agency, Tokyo, Japan |
| Abstract: | With full-depth LADCP velocity data collected in a wide area southeast of Kyushu, Japan, large velocity currents, occasionally exceeding 15 cm s?1, were observed in a thick, 500–1,500 m, near-homogeneous density layer below approximately 3,000 m depth around the steep topographies. The currents were found not to flow along the topographic contours, and to be strongly ageostrophic. The directions of the bottom-layer currents are rather related with phase of the semi-diurnal tides, suggesting deeply intruded internal tides generated at the steep topographies. |
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