Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223611v&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 23, CiteID L23611
Physics
11
Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Coriolis Effects, Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: General: Ocean Data Assimilation And Reanalysis (3225)
Scientific paper
Spectra from historic long-term open-ocean moored current meter data between latitudes 0° < |$\varphi$| < 45° reveal a significant drop in semidiurnal tidal band (D2) energy by ~50% at |$\varphi$| ~ 25-27°, whilst the peak near the local inertial frequency f is increased by a factor of ~10 up to the level of D2-energy at |$\varphi$| ~ 28-30°, where f coincides with diurnal frequencies. The increase in f-energy is accompanied by a red-shift of the peak frequency to 0.97 +/- 0.01f, or a poleward spreading of enhanced energy. This contrasts with more common blue-shift. The enhancement may be the result of sub-harmonic instability, as supported by sparse significant bicoherence at half-D2, although i) systematic enhancement of diurnal tidal frequencies, notably M1, was not observed, ii) the latitudes of low D2-energy and high f-energy do not coincide. This may be due to a mix of coupled and independent waves, whilst the poleward trapping of sub-f energy suggests non-traditional effects.
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