Scattering of near-inertial internal waves along the Japanese coast of the Japan Sea

Yosuke Igeta, Yutaka Kumaki, Yujiro Kitade, Tomoharu Senjyu, Haruya Yamada, Tatsuro Watanabe, Osamu Katoh, Masaji Matsuyama

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The scattering of near-inertial internal waves (NIIWs) induced at the tips of landmasses was investigated by mooring observations using current meters and thermometers in the surface layer along peninsulas and an island located along the Japanese coast of the Japan Sea during the fall of 2006. Signals of NIIWs were found in alongshore currents and in temperatures recorded near the seasonal thermocline. The signals appeared after wind stress had reached a maximum, and they lasted for more than 2 days. Relatively high current energy regions due to NIIWs were localized around the northern parts of the peninsulas and island. The phase lag of the temperature fluctuations increased in the southern regions along the eastern coasts of the peninsulas and island. The generation and propagation of NIIWs were investigated by numerical experiments that used a multilayer level model with realistic topography. Model results showed that NIIWs induced by the wind struck the tips of landmasses and scattered and that NIIWs were trapped by the coast and propagated with characteristics of coastal-trapped waves (CTWs) and then rapidly attenuated. The CTWs had a distorted current structure at landmass tips because of periodic beam-like current structures from the seafloor. These signals show that CTWs radiate energy away from the shore as internal waves originating from topographical scattering, which is considered to cause the rapid attenuation of the CTWs.

Original languageEnglish
Article numberC10002
JournalJournal of Geophysical Research: Oceans
Volume114
Issue number10
DOIs
Publication statusPublished - Oct 8 2009
Externally publishedYes

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internal waves
internal wave
coasts
Coastal zones
Japan
scattering
trapped wave
Scattering
coast
peninsulas
thermometers
energy
meters (equipment)
topography
temperature
mooring
thermoclines
sea
wave energy
beam currents

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Scattering of near-inertial internal waves along the Japanese coast of the Japan Sea. / Igeta, Yosuke; Kumaki, Yutaka; Kitade, Yujiro; Senjyu, Tomoharu; Yamada, Haruya; Watanabe, Tatsuro; Katoh, Osamu; Matsuyama, Masaji.

In: Journal of Geophysical Research: Oceans, Vol. 114, No. 10, C10002, 08.10.2009.

Research output: Contribution to journalArticle

Igeta, Y, Kumaki, Y, Kitade, Y, Senjyu, T, Yamada, H, Watanabe, T, Katoh, O & Matsuyama, M 2009, 'Scattering of near-inertial internal waves along the Japanese coast of the Japan Sea', Journal of Geophysical Research: Oceans, vol. 114, no. 10, C10002. https://doi.org/10.1029/2009JC005305
Igeta, Yosuke ; Kumaki, Yutaka ; Kitade, Yujiro ; Senjyu, Tomoharu ; Yamada, Haruya ; Watanabe, Tatsuro ; Katoh, Osamu ; Matsuyama, Masaji. / Scattering of near-inertial internal waves along the Japanese coast of the Japan Sea. In: Journal of Geophysical Research: Oceans. 2009 ; Vol. 114, No. 10.
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