Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa34a..02w&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA34A-02
Physics
0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves
Scientific paper
Longitudinal variability in many observables in the upper atmosphere are now being identified. One candidate for the source of this variability is interference between large scale waves. It is now known that non-migrating tides have amplitudes which are of the same order as the migrating tides and planetary waves in this region of the atmosphere. Interference between these various waves results in geographic variations in the locally determined amplitudes and phases of many waves. Although the exact amplitudes of the various wave components in a GCM do not yet match observations, an examination of the superposition effects in such models does provide an indication of the nature of this interference. In this paper, a run of the extended Canadian Middle Atmosphere model is used to illustrate and quantify the form of the resulting longitudinal variability in wind, temperature, and airglow. Comparison of model geographical variations with the observed variations is a rigorous test for how well a model simulates the large scale wave environment in the atmosphere.
Du Jiulin
Ward William E.
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