Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..29w&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 14, pp. 29-1, CiteID 1684, DOI 10.1029/2002GL014866
Physics
18
Planetary Sciences: Atmospheres-Structure And Dynamics, Planetary Sciences: Meteorology (3346), Planetology: Solar System Objects: Mars, Meteorology And Atmospheric Dynamics: Waves And Tides
Scientific paper
Analysis of temperature retrievals from Mars Global Surveyor Thermal Emission Spectrometer data has revealed the presence of regular, eastward propagating waves in the Northern Hemisphere. A large amplitude, zonal wave 1 with a long (~20 sol) period is particularly prominent during early winter (Ls = 220-270°). After Ls = 270°, a weaker and more rapidly propagating (6.5 sol period) zonal wave 1 is dominant. These waves have a deep vertical structure (>40 km) correlated with the axis of the winter hemisphere westerly jet. Simulations with a Mars general circulation model suggest that the fast wave is associated with baroclinic instability due to the strong meridional temperature gradient at the surface and is consistent with surface pressure oscillations seen in Viking Lander data. By contrast, the slow wave has the appearance of a large-amplitude Rossby wave that is coupled with an inertially unstable region in the subtropics.
Banfield Don
Conrath Barney J.
Smith Michael D.
Wilson Richard J.
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