Abstract
Abstract. Observational evidence is presented for interaction between nonlinear internal Kelvin waves at the ωt,i (where the ωt is the semidiurnal frequency and the ωi is the inertial frequency) and random oscillations of the background coastal current at the sub-inertial Ω frequency in the Japan/East Sea. Enhanced coastal currents at the sum ω+ and difference ω-frequencies ω±=ωt,i ± Ω have properties of propagating Kelvin waves, which suggests permanent energy exchange from the sub-inertial band to the mesoscale ω± band. This interaction may be responsible for a greater-than-predicted intensification, steepening and breaking of boundary-trapped Kelvin waves. The problem of interaction between the nonlinear Kelvin wave at the frequency ω and the low-frequency narrowband noise with representative frequency Ω≪ω is investigated using the theory of nonlinear weak dispersion waves.
Highlights
Ω3 + ω1, decay of and the ω± band
We consider the interaction of a nonlinear internal Kelvin waves (IKWs) with the frequency ω0 and narrowband sub-inertial noise using the nonlinear internal wave model described by Eq (7)
Internal Kelvin waves play an important role in the dynamics of the coastal oceans
Summary
Ω3 + ω1, decay of and the ω± band. This interaction may be responsible for a grDeaistceur-ssions In this paper, we present observational evidence for interthan-predicted intensification, steepening and breaking of actions among narrowband sub-inertial random oscillations boundary-trapped Kelvin waves. Let us consider the propagation of coastal internal Kelvin waves (IKWs) in a layer with depth H of a continuously stratified fluid with the buoyancy frequency N(z).
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