Observations of parametric subharmonic instability of the diurnal internal tide in the South China Sea

Details Observations of parametric subharmonic instability of the diurnal internal tide in the South China Sea Observations of parametric subharmonic instability of the diurnal internal tide in the South China Sea

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515602a&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15602

Physics

3

Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Physical: Fine Structure And Microstructure

Scientific paper

Shipboard observations are presented that suggest the occurrence of parametric subharmonic instability (PSI) of diurnal K1 and O1 internal tides at ``critical'' latitudes of 14.52°N and 13.44°N, respectively. In a transect spanning 12.5-18°N, depth-mean shear squared shows sharp peaks at 14.52°N (elevated relative to that at 15°N by a factor of ten) and at 13.44°N (by a factor of 7). Wind speed measured from the ship and Quikscat scatterometer during and before the transect was <10 m s-1 at these latitudes. Eight-hour time series (about 1/6 of an inertial period) of shear and isopycnal depth at 14.52°N are sufficient to associate the elevated shear with alternating, clockwise-rotating layers analogous to those observed at the M2 critical latitude of 28.8°N.

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