Thermal tides and Martian dust storms - Direct evidence for coupling

Details Thermal tides and Martian dust storms - Direct evidence for coupling Thermal tides and Martian dust storms - Direct evidence for coupling

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2956l&link_type=abstract

Journal of Geophysical Research, vol. 84, June 10, 1979, p. 2956-2968.

Physics

12

Atmospheric Tides, Dust Storms, Mars Atmosphere, Pressure Oscillations, Viking Mars Program, Coupled Modes, Hodographs, Viking Lander 1, Viking Lander 2, Wind Variations, Mars, Pressure, Oscillations, Viking 1 Lander, Dust, Viking 2 Lander, Landing Sites, Atmosphere, Seasons, Diurnal Variations, Wind, Tides, Models, Heating, Surface, Martian, Dust Storms, Comparisons, Temperatures, Infrared, Mapping, Thermal Properties

Scientific paper

Evidence for the coupling of diurnal and semidiurnal thermal tides, observed as surface pressure oscillations at the Viking Lander 1 and 2 landing sites, to Martian global dust storms is presented and the implications for models of dust storm generation are discussed. Local atmospheric opacity increases and jumps in atmospheric pressure ranges were found to be essentially simultaneous, and diurnal and semidiurnal components of the pressure and wind oscillations were observed to increase markedly after the onset of a dust storm. The semidiurnal wind component can be related to the observed surface pressure variations by means of a model of a semidiurnally forced Ekman boundary layer. However, a classical atmospheric tidal model shows that the preferential enhancement of the semidiurnal surface pressure oscillation observed at the Lander 1 site can be produced by a tidal heating distribution in which most of the heating is done at an altitude above 10 km. Observations suggest that various mechanisms are important for the generation and decay of global Martian dust storms.

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