Observations of Internal Waves in the Upper Ocean
Profiles of temperature versus depth in the top 440 m of the sea were taken repeatedly at three horizontal locations surrounding the Research Platform FLIP. The time fluctuation of the temperature profiles was used to determine isotherm displacement and slope variation in the region 60-400 m. Measurements were taken during three FLIP operations. Two were off the California coast, in November 1972 and June 1973. Horizontal and vertical coherence measurements indicate that the internal wavefield can be divided into two frequency regions. Above 2 cph the bandwidth of energetic horizontal and vertical wavenumbers is comparatively narrow. The isotherm displacement spectrum and slope spectrum have irregular slopes. A comparison of the two spectra indicate that first mode is strongly dominant. Below 2 cph, the bandwidth of energetic wavenumbers is broader, corresponding to many energetic modes.
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