Mechanical Energies of the Upper Atmosphere in the High Latitudes of Mars

Details Mechanical Energies of the Upper Atmosphere in the High Latitudes of Mars Mechanical Energies of the Upper Atmosphere in the High Latitudes of Mars

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p21a1653l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P21A-1653

Physics

[5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5445] Planetary Sciences: Solid Surface Planets / Meteorology, [5462] Planetary Sciences: Solid Surface Planets / Polar Regions

Scientific paper

We characterize the mechanical energies of the upper atmosphere (0.1-2.2 mbar) in the high latitudes of Mars (45-89°) with an analysis based on the observations from the Thermal Emission Spectrometer (TES) onboard the Mars Global Surveyor (MGS). Our analysis reveals that the eddy available potential energy is much stronger in the Southern Hemisphere (SH) (11.61-14.75 J/m2) than in the Northern Hemisphere (NH) (3.17-3.21 J/m2) so that the total mechanical energy of the upper atmosphere in the high latitudes is roughly two times larger in the SH than in the NH. In addition, the eddy available potential energy is larger than the mean available potential energy in the two hemispheres, a phenomenon different from the characteristics of the mechanical energies on Earth. We also find that the transient eddy energies are at least one order magnitude larger than the stationary eddy energies in the high latitudes of Mars. The comparison of mechanical energies further reveals that the time variation of energy components between the two Martian years (MY25 and MY26) is much significant in the SH (8.7-36.0%) than in the NH (0.9-4.5%) due to the different influence of the global dust storm to the mechanical energies in the two hemispheres.

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