Evolution of the semidiurnal (M2) internal tide on the continental slope of the northern South China Sea

Details Evolution of the semidiurnal (M2) internal tide on the continental slope of the northern South China Sea Evolution of the semidiurnal (M2) internal tide on the continental slope of the northern South China Sea

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3513604x&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 13, CiteID L13604

Other

5

Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Physical: Surface Waves And Tides (1222)

Scientific paper

Kinetic energy spectra from a site on the continental slope in the South China Sea reveal that significant peaks appear at some nonlinear interaction frequencies, namely M 3 (M 1 + M 2) and fM 1 (M 1 + f), where f is the inertial frequency, M 1 is the diurnal internal wave, and M 2 is the lunar semidiurnal internal tide. A possible generation mechanism of M 3 is explored. Analysis of bicoherence and shear spectra suggests that strong M 3 is indirectly associated with parametric subharmonic instability (PSI) of M 2. In another word, under the effect of PSI the energy of M 2 is first transferred to M 1; then via other nonlinear coupling, some nonlinear waves (e.g. fM 1, M 3) are generated. Moreover, M 1 is also present at another site near the bottom of the continental slope. The shear spectra from these two sites show, for the first time, that M 1 can be significantly distinguished from lunar diurnal O 1 and lunisolar diurnal K 1.

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