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The spectrum of convectively generated gravity waves is currently not resolved in general circulation models and must be parameterized. Due to the lack of understanding of the connection between convection properties and gravity waves, such parameterizations assume a source spectrum of gravity waves that is not linked to the forcing region. This paper introduces a method of specifying the gravity wave spectrum above convection based on the latent heating properties and background wind in the convective region that can be implemented in general circulation models. This method is based on linear calculations of momentum flux generated by a multifrequency thermal forcing and incorporates the effects of tropospheric mean wind in the convective environment. In the analysis, gravity waves that are generated by both the steady and the oscillatory component of the heating are included. It is shown that an accurate spectrum of convectively generated gravity waves can be deduced from the knowledge of approximate horizontal and vertical scales of the latent heating region, the heating rate, and tropospheric wind profile.

A Method of Specifying the Gravity Wave Spectrum above Convection Based on Latent Heating Properties and Background Wind