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Volume transports proceeding to the Kuroshio Extension region and recirculating in the Shikoku Basin |
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| Authors: | Akira Nagano Kaoru Ichikawa Hiroshi Ichikawa Masanori Konda 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. Graduate School of Science, Kyoto University, Kyoto, Japan 4. Global Environment Marine Department, Japan Meteorological Agency, Tokyo, Japan |
| Abstract: | The volume transport of the Kuroshio, the western boundary current of the North Pacific subtropical gyre, varies vigorously due to merging of disturbances propagating from the entire North Pacific. Taking into account the recirculation in the Shikoku Basin by the zonal observation line at 30°N to the west of the Izu–Ogasawara Ridge, we estimated the volume transport in the top 1,000 m layer toward the Kuroshio Extension region. The volume transport of the local recirculation gyre in the Shikoku Basin increases associated with the westward extension of the gyre, particularly in the period of the large meandering path of the Kuroshio south of Japan. Meanwhile, most of the transport variations toward the Kuroshio Extension region correspond to those of the Kuroshio transport on the continental slope south of Japan, which vary independently of those of the recirculation gyre. |
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