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AGU: Geophysical Research Letters

 

Index Terms

  • Oceanography: Physical: Fronts and jets
  • Oceanography: Physical: Internal and inertial waves
  • Oceanography: Physical: Nearshore processes
  • Oceanography: Physical: Turbulence, diffusion, and mixing processes
  • Oceanography: General: Coastal processes

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L14607, 4 PP., 2006
doi:10.1029/2006GL025866

Occasional intensification of semidiurnal internal tide in Bungo Channel, Japan

Yuji Kawamura

Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan

Yuichi Hayami

Ariake Sea Research Project, Saga University, Saga, Japan

Takeshi Kohama

Department of Disaster Prevention System Subject, Chiba Institute of Science, Choshi, Japan

Atsushi Kaneda

Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan

Hidetaka Takeoka

Center for Marine Environmental Studies, Ehime University, Matsuyama, Japan

Data of mooring observation in Kitanada Bay, located on the eastern coast of Bungo Channel in Japan, obtained during summer 2001 are analyzed to investigate a modification process of the semidiurnal internal tide by density currents, occasionally occurring in the channel. The mooring data show that the semidiurnal internal tide has the character of low vertical mode standing wave. When the bottom slope near the mooring station is near-critical, the energy of the semidiurnal internal tide in the lower layer reached the maximum value. Since the density current modifies the density stratification occasionally creating the near-critical condition, it strongly affects the intensity of the semidiurnal internal tide energy in the lower layer.

Received 30 January 2006; accepted 5 June 2006; published 21 July 2006.

Citation: Kawamura, Y., Y. Hayami, T. Kohama, A. Kaneda, and H. Takeoka (2006), Occasional intensification of semidiurnal internal tide in Bungo Channel, Japan, Geophys. Res. Lett., 33, L14607, doi:10.1029/2006GL025866.

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