Large ageostrophic currents in the abyssal layer southeast of Kyushu, Japan, by direct measurement of LADCP

Akira Nagano, Kaoru Ichikawa, Hiroshi Ichikawa, Yasushi Yoshikawa, Kiyoshi Murakami

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)259-268
Number of pages10
JournalJournal of Oceanography
Volume69
Issue number2
DOIs
Publication statusPublished - Apr 2013

All Science Journal Classification (ASJC) codes

  • Oceanography

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