Nonlinear motions at the internal tide source

Details Nonlinear motions at the internal tide source Nonlinear motions at the internal tide source

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311605v&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11605

Physics

Geophysics

4

Nonlinear Geophysics: Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852), Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: General Or Miscellaneous

Scientific paper

Oceanic internal tidal wave generation is commonly modeled via interaction of a sinusoidal barotropic vertical velocity W with topography. However, general w above slopes are predominantly nonlinear, as appears in some nonhydrostatic models. Here, 1-2 Hz sampled observations are presented from 2-84 m above the bottom (mab) at ~1400 m at the Bay of Biscay continental slope. Fronts are observed that all propagate upslope having heights >50 mab and more or less, +/-5%, occurring at the tidal periodicity. They are accompanied by O(10 min) pulses of w~0.10 m s-1 $\gg$W and irregular small-scale waves superimposed on an asymmetric tidal signal. This nonlinearity is further exemplified by variations in frontal arrival and steepness, height, form, and is causing: i) internal tidal intermittency of ~10 tidal periods, ii) nonlinear generation of internal tidal higher harmonics at the source. The observations suggest internal tide generation in a broadband instead of a monochromatic beam.

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