Planetary-scale wave structure in the Martian atmosphere

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Atmospheric Pressure, Atmospheric Temperature, Mars Atmosphere, Meridional Flow, Planetary Waves, Power Spectra, Data Acquisition, Geostrophic Wind, Mariner 9 Space Probe, Spectrum Analysis, Viking Lander Spacecraft, Mars, Atmosphere, Waves, Mariner 9 Mission, Iris Instrument, Hypotheses, Spacecraft Observations, Origin, Latitudes, Temperature, Formation, Calculations, Spectroscopy, Perturbations, Baroclinity

Scientific paper

Wave-like perturbations are found in the Mariner 9 IRIS atmospheric temperature data during late Northern Hemisphere winter in a latitude band between 45 deg N and 65 deg N. The nature of the data base prevents a unique separation of spatial and temporal behavior, but Fourier analysis of the data constrains the waves to discrete combinations of planetary wavenumber and period. One major spectral component possesses a meridional amplitude cross section with a maximum near the 1 mbar level at 60 deg N and is strongly correlated with the circumpolar jet observed in thermal winds calculated from the mean meridional temperature cross section. This feature is consistent with the low-wavenumber baroclinic waves observed in Viking Lander data, and the vertical structure reflects the behavior anticipated for a vertically penetrating quasi-geostrophic disturbance. Other possible origins for the wave cannot be ruled out, however. Among these is a stationary wave forced by wavenumber-2 topographic relief.

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