Doppler spreading of internal gravity waves by an inertia-wave packet

Authors


Abstract

[1] Present Doppler-spreading models for the high wave number end of atmospheric and oceanic internal wave spectra either neglect the time dependence of the background long-wave shear entirely, or ignore time-dependent effects in their parameterization of dissipation. Through ray tracing and numerical simulations the Doppler spreading of an idealized interaction between a short internal-wave packet by an inertia-wave packet is examined. The results are sufficient to show that time dependence in the long-wave shear can make a significant difference to short-wave behavior, and will need to be taken into account in future modeling efforts.