Physics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306618v&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 6, CiteID L06618
Physics
4
Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)
Scientific paper
Yearlong data from a single ADCP above the northern extension of the Mid-Atlantic Ridge are used to investigate vertical internal wave propagation in the open ocean (395-1025 m). Whilst 80% of incoherent semidiurnal tidal (D2) phase propagates downward, 90% of near-inertial (f) phase propagates upward. Most upward propagating f-phase is found at sub-f frequencies σmin(N = f) ~ 0.74f < σ <= 0.99f, N the buoyancy frequency and σmin the lower bound of the inertio-gravity (IG) wave band following the `non-traditional approach', which includes the horizontal component of the Earth's rotation in momentum equations. The upper bound of mostly downward propagating D2-phase coincides with the upper IG-bound σmax(N = f) ~ 1.35f. The limited band [σmin, σmax] demonstrates that f and D2 contain special internal waves concerning vertical propagation. It is suggested that this is partially attributable to small-scale step layering in N, with N = f separating `trapping' from `classic propagating' wave regimes, rendering the mean large-scale N ~ 18f less important.
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