Subsurface current structures east of the Amami-Oshima Island based on LADCP observation

DOI Web Site 17 References
  • Nagano Akira
    Research Institute for Global Change, JapanAgencyfor Marine-Earth Science and Technology
  • Ichikawa Kaoru
    Research Institute for Applied Mechanics, Kyushu University
  • Ichikawa Hiroshi
    Research Institute for Global Change, JapanAgencyfor Marine-Earth Science and Technology
  • Yoshikawa Yasushi
    Mutsu Institute for Oceanography, Japan Agencyfor Marine-Earth Science and Technology
  • Konda Masanori
    Graduate School of Science, Kyoto University
  • Murakami Kiyoshi
    Global Environment Marine Department, Japan Meteorological Agency

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  • LADCP観測に基づいた奄美大島東方の亜表層流速構造

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The current system east of the Ryukyu Islands has been called the Ryukyu Current System (RCS) to express its possibly different origins and features. In this paper, we presented a new feature on the vertical structure of the current system by using lowered acoustic Doppler current profiler (LADCP) data in early October 2005: a southwestward countercurrent was demonstrated to flow near the eastern slope of the Nansei-Shoto (Ryukyu Islands) Ridge in a layer deeper than the northeastward current core of the RCS. This supports the existence of the countercurrent suggested by Nagano et al. (2009). The maximum speed of the countercurrent was measured to be 25 cm s^-1 at a depth of approximately 600 m.

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