Sub-inertial modulation of nonlinear Kelvin waves in the coastal zone

Stepanov, D. V.; Novotryasov, V. V.

Observational evidence is presented for interaction between nonlinear internal Kelvin waves at the ω t,i (where the ω t is the semidiurnal frequency and the ω i 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 ±t,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.

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Stepanov, D. V. / Novotryasov, V. V.: Sub-inertial modulation of nonlinear Kelvin waves in the coastal zone. 2013. Copernicus Publications.

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Rechteinhaber: D. V. Stepanov

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