Evidence of Gravity Waves in the Martian Atmosphere

Details Evidence of Gravity Waves in the Martian Atmosphere Evidence of Gravity Waves in the Martian Atmosphere

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2416b&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.16; Bulletin of the American Astronomical Society, Vol. 39, p.457

Astronomy and Astrophysics

Astronomy

Scientific paper

Atmospheric temperatures retrieved at several pressure levels from MGS-TES radiance data in the 15 μm CO2 band exhibit quasi-periodic variations with amplitudes as much as ±5 K and wavelengths on the order of 15 - 20 km along ground tracks over three craters (Holden, Eberswalde, and Terby) that have large-amplitude relief. By contrast, temperatures retrieved along a ground track over a region with low relief exhibited variations on the order of ±1 K or less. This is suggestive of gravity waves induced by atmospheric flow over the underlying terrain. If they are terrain-induced gravity waves, and if we assume the flow is parallel to the south-north ground track, their wavelengths imply meridional wind speeds v ≤ ±20 m s-1 near the surface. If the flow is at an oblique angle to the ground track, the implied wind speeds are considerably smaller.

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