Frontal systems during passage of the Martian north polar HOOD over the Viking Lander 2 site prior to the first 1977 dust storm

Details Frontal systems during passage of the Martian north polar HOOD over the Viking Lander 2 site prior to the first 1977 dust storm Frontal systems during passage of the Martian north polar HOOD over the Viking Lander 2 site prior to the first 1977 dust storm

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2947t&link_type=abstract

Journal of Geophysical Research, vol. 84, June 10, 1979, p. 2947-2955.

Physics

6

Dust Storms, Fronts (Meteorology), Mars Atmosphere, Viking Lander 2, Atmospheric Pressure, Atmospheric Temperature, Diurnal Variations, Periodic Variations, Viking Lander 1, Mars, Viking 2 Lander, Wind, Temperatures, Dust Storms, Pressure, Landing Sites, Radiation, Viking 1 Lander, Seasons, Climate, Weather

Scientific paper

Analysis of a 12-sol period of wind speed, wind direction, temperature, pressure, and optical depth at the Viking Lander 2 site presents the first in situ evidence of high- and low-pressure systems, complete with fronts, on the surface of Mars. The discovery of these systems in the Lander data occurred while analyzing a period during which the north polar hood was advected over the site at midday, dramatically decreasing the surface illumination and surface-to-atmospheric heat flux. This obscuration immediately preceded a global dust storm in the southern hemisphere and low latitudes of the northern hemisphere. The direct effects of the dust storm, reached 48 N, the Lander 2 latitude, later more gradually than they reached the 22 deg N latitude of Lander 1. The system responsible for the polar hood passages is a major disturbance, and it appears that radiational damping is inadequate to stop strong frontal formation. The front analyzed is characteristic of a repetitive series of systems that pass roughly every 3.3 sols. These systems are similar to those predicted by theoretical analyses and by general circulation modeling of the Martian atmosphere and those observed in laboratory experiments.

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