The anelastic subspace to measure internal gravity waves in hydrodynamical simulations

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  • 4 November 2003
Abstract
The excitation of internal gravity waves by an entropy bubble oscillating in an isothermal atmosphere is investigated using direct two-dimensional numerical simulations. The oscillation field is measured by a projection of the simulated velocity field onto the anelastic solutions of the linear eigenvalue problem for the perturbations. This facilitates a quantitative study of both the spectrum and the amplitudes of excited g-modes. The mode energies are shown to be inversely proportional to the aspect ratio of the box and scale with wavenumber to the 2/3 power.

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