Dynamics and energetics of trapped diurnal internal Kelvin waves around a mid-latitude island

Dynamics and energetics of trapped diurnal internal Kelvin waves around a mid-latitude island AbstractThe generation of trapped and radiating internal tides around Izu-Oshima Island located off Sagami Bay, Japan is investigated using the three-dimensional SUNTANS model that is validated with observations of isotherm displacements in shallow water. The model is forced by barotropic tides, which generate strong baroclinic internal tides in the study region. Model results showed that, when diurnal (K1) barotropic tides dominate, resonance of a trapped internal Kelvin wave leads to large-amplitude internal tides in shallow waters on the coast. This resonance produces diurnal motions that are much stronger than the semidiurnal motions. The weaker freely propagating semidiurnal internal tides are generated on the western side of the Island where the M2 internal tide beam angle matches the topographic slope. The internal wave energy flux due to the diurnal internal tides is much higher than that of the semidiurnal tides in the study region. Although the diurnal internal tide energy is trapped, we show that steepening of the Kelvin waves produces high-frequency internal tides that radiate from the island, thus acting as a mechanism to extract energy from the diurnal motions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Dynamics and energetics of trapped diurnal internal Kelvin waves around a mid-latitude island

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0485
D.O.I.
10.1175/JPO-D-16-0167.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe generation of trapped and radiating internal tides around Izu-Oshima Island located off Sagami Bay, Japan is investigated using the three-dimensional SUNTANS model that is validated with observations of isotherm displacements in shallow water. The model is forced by barotropic tides, which generate strong baroclinic internal tides in the study region. Model results showed that, when diurnal (K1) barotropic tides dominate, resonance of a trapped internal Kelvin wave leads to large-amplitude internal tides in shallow waters on the coast. This resonance produces diurnal motions that are much stronger than the semidiurnal motions. The weaker freely propagating semidiurnal internal tides are generated on the western side of the Island where the M2 internal tide beam angle matches the topographic slope. The internal wave energy flux due to the diurnal internal tides is much higher than that of the semidiurnal tides in the study region. Although the diurnal internal tide energy is trapped, we show that steepening of the Kelvin waves produces high-frequency internal tides that radiate from the island, thus acting as a mechanism to extract energy from the diurnal motions.

Journal

Journal of Physical OceanographyAmerican Meteorological Society

Published: Aug 2, 2017

References

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