Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jats...50.2180m&link_type=abstract
Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 50, no. 14, p. 2180-2200.
Computer Science
43
Atmospheric General Circulation Models, Atmospheric Heating, Latent Heat, Middle Atmosphere, Planetary Waves, Traveling Waves, Convective Heat Transfer, Gravity Waves
Scientific paper
The excitation and propagation of equatorial planetary waves and inertia-gravity waves were studied by comparing simulations from the comprehensive GFDL troposphere-stratosphere-mesosphere SKYHI GCM and from a linear primitive equation model with the same domain and numerical resolution. The basic state of the linear model is time dependent and is derived from the mean zonal wind and temperature obtained from a simulation with the full SKYHI model. The latent and convective heating fields of this SKYHI integration are used as the forcing for the linear model in a parallel simulation. The wavelength and frequency characteristics of the prominent vertically propagating equatorial Kelvin and Rossby-gravity waves are remarkably similar in the linear model and in SKYHI. Amplitudes are also similar in the lower stratosphere, indicating that the latent and convective heating is the dominant mechanism producing equatorial wave activity in the GCM. The amplitude of these waves in the upper stratosphere and mesosphere is larger in the linear model than in SKYHI. It appears that the wave amplitudes in SKYHI are limited by some nonlinear saturation, possibly involving the subgrid-scale vertical mixing. The results show that a significant fraction of the inertia-gravity wave activity found in the midlatitude mesosphere of the SKYHI model can be accounted for by tropical convective heating.
Hamilton Kevin
Manzini Elisa
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