Semiannual oscillations in the atmosphere of Mars

Details Semiannual oscillations in the atmosphere of Mars Semiannual oscillations in the atmosphere of Mars

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.p34a..04m&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #P34A-04

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6225 Mars

Scientific paper

The semiannual oscillation (SAO) of the mean zonal wind is a prominent feature of the Earth equatorial strato- and mesosphere, but was never detected on other planets. We found a 6-month periodicity in the difference between day- and night-time atmospheric temperatures, a good proxy for solar tides, measured from Mars Global Surveyor. Simulations with a general circulation model provided clear evidence that this signal is a manifestation of the SAO. We applied the model to explain the seasonal asymmetry and to examine the forcing of the Martian SAO. The analysis revealed that the driving mechanism is very different than on Earth. The super-rotation momentum is supplied largely by thermal tides and quasi-stationary planetary waves induced by the Martian topography, while Kelvin waves provide small retrograde torque.

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