Variations of diurnal and inertial spectral peaks near the bi-diurnal critical latitude

Details Variations of diurnal and inertial spectral peaks near the bi-diurnal critical latitude Variations of diurnal and inertial spectral peaks near the bi-diurnal critical latitude

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3602606x&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 2, CiteID L02606

Physics

2

Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Upper Ocean And Mixed Layer Processes, Oceanography: Physical: Eddies And Mesoscale Processes

Scientific paper

Three sets of ADCP data obtained from the upper ocean are used to examine possible influence of parametric subharmonic instability (PSI) at $\varphi$ c ~ 13-15°N. Both kinetic-energy and shear spectra at $\varphi$ c reveal that significant peaks appear at subharmonic frequencies of diurnal internal tides. Especially, the 0.5 K 1 (subharmonic of K 1 tides) can be trapped poleward of its critical latitude (14.52°N), significantly distinguished from wind generated near-inertial internal waves. Moreover, the enhanced 0.5 K 1 motions are more or less subject to a fortnightly spring-neap circle. Relative to a higher latitude (say 18°N), diurnal motions at $\varphi$ c are greatly weakened. In contrast, small vertical-scale motions in the inertial band and the shear induced by these motions are significantly enhanced. Likely, PSI mechanism plays an important role in these observations, whilst trapped sub-inertial waves (0.5 K 1) may be associated with the presence of negative sub-inertial eddies.

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