Computer Science
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.......130m&link_type=abstract
Thesis (PH.D.)--PRINCETON UNIVERSITY, 1992.Source: Dissertation Abstracts International, Volume: 53-06, Section: B, page: 2928.
Computer Science
Scientific paper
The excitation and propagation of planetary and gravity waves in the atmosphere are studied by comparing solutions from a numerical model based on the linear primitive equations and from the comprehensive GFDL SKYHI general circulation model (GCM) for the troposphere, stratosphere, and mesosphere. The basic state of the linear model is time dependent and derived from the mean zonal wind and temperature given by a 78-day simulation with the SKYHI model. The latent and convective heating fields of this SKYHI simulation provide the forcing for the linear model in the tropical and subtropical troposphere. The phase characteristics of the vertically propagating equatorial Kelvin waves and gravity waves exhibited in calculations with the linear model and the GCM are found to be remarkably similar, indicating that the latent and convective heating is the main mechanism producing wave activity in the tropical atmosphere of the GCM. The results also show that gravity waves generated in the equatorial troposphere can reach the midlatitude mesosphere when strong mean flows exist whose direction is opposite the phase speed. In both models the vertical extent of the thermal forcing appears to control the dominant phase characteristics of the Kelvin and gravity waves. However, the amplitudes of the vertically propagating waves in the SKYHI model, particularly in the mesosphere, are somewhat smaller than those of linear model, which has only radiative damping and horizontal diffusion. This difference indicates that vertical diffusion is important in the full GCM. The global scale Rossby normal modes seen in observations are also identified in the analyses of easterly propagating planetary waves in both models. They are of realistic amplitude in the SKYHI simulation but are much weaker in the linear model. Thus it appears that latent and convective heating is not the main source of excitation for the Rossby normal modes.
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