Simulation study on gravity waves in the Martian atmosphere

Details Simulation study on gravity waves in the Martian atmosphere Simulation study on gravity waves in the Martian atmosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p24a..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P24A-03

Physics

[0343] Atmospheric Composition And Structure / Planetary Atmospheres, [3346] Atmospheric Processes / Planetary Meteorology, [3389] Atmospheric Processes / Tides And Planetary Waves, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres

Scientific paper

Using a Mars General Circulation Model (GCM) with high horizontal resolution, we investigate the characteristics of gravity waves in the atmosphere of Mars. The GCM used in this study is the Global Mars Multiscale Model (GMMM) developed by Moudden and McConnell [2005]. The features of gravity waves obtained in the GMMM are as follows. Fluctuations due to internal gravity waves at tidal periods, such as diurnal, semidiurnal and terdiurnal tides, are predominant in the lower atmosphere. In particular, the diurnal and semidiurnal tides having large zonal wave numbers (s > 10) are significant. Fluctuations associated with non-tidal gravity wave components in the lower atmosphere are negligibly small except for the stationary orographic component. Non-tidal gravity waves grow in amplitude in the middle atmosphere while tidal components remain the dominant form of gravity waves. In the upper atmosphere (> 80 km), non-tidal gravity wave components become important. We estimate the global distributions of the gravity wave energy at various altitudes and attempt to define various sources. Our results show that most non-tidal gravity wave energy is closely related with the diurnal amplitude except in the lower atmosphere where association with orography predominates. This suggests that non-orographic gravity waves are generated by the breaking and dissipation of the diurnal tide. We also enumerate the major differences between gravity waves on Mars and Earth as simulated by global models.

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