Do deep-ocean kinetic energy spectra represent deterministic or stochastic signals?
van Haren, H. (2016). Do deep-ocean kinetic energy spectra represent deterministic or stochastic signals? J. Geophys. Res. 121: 240-251. dx.doi.org/10.1002/2015JC011204
In: Journal of Geophysical Research. American Geophysical Union: Richmond. ISSN 0148-0227; e-ISSN 2156-2202, meer
In analogy with historic analyses of shallow-water tide-gauge records, in which tides and theirhigher harmonics are modified by sea level changes induced by atmospheric disturbances, it is shown thatdeep-sea currents can be interpreted as motions at predominantly inertial-tidal harmonic frequencies modifiedby slowly varying background conditions. In this interpretation, their kinetic energy spectra may not besmoothed into a quasi-stochastic continuum for (random-)statistic confidence. Instead, they are consideredas quasi-deterministic line-spectra. Thus, the climatology of the internal wave field and its slowly varyingbackground can be inferred from line spectra filling the cusps around nonlinear tidal-inertial harmonics, assuggested previously.
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