短波重力波領域におけるスペクトル形状とソースバランス

抄録

We investigated the spectral structure and source balance of short gravity waves,based on in situ observations of wavenumber spectra retrieved by air-sea interaction spar (ASIS) buoys. The observed wavenumber spectra showed the spectral power laws described by Toba [1973] and Phillips [1958] in addition to the characteristic nodal point at ~10 rad/m. The wave model reproduced the spectral form in the higher wavenumber domain using the nonlinear dissipation term. In the equilibrium range,nonlinear transfer played a major role in maintaining equilibrium conditions. On the other hand,in the saturation range,which starts at the upper limit of the equilibrium range, nonlinear transfer did not keep up with other source terms, and the dissipation term was in balance with wind input.