Mathematics – Logic
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0313s&link_type=abstract
American Astronomical Society, DPS meeting #28, #03.13; Bulletin of the American Astronomical Society, Vol. 28, p.1067
Mathematics
Logic
Scientific paper
Towards the end of the southern hemisphere winter the Martian southern polar cap extends at its largest up to 40\(^{\circ} \) and hence covers part of, e.g., the southern slopes of the Hellas and the Argyre basin possibly entirely. During the early phase of the cap retreat the lower parts of the northern slopes of Argyre are ice-covered. As the season progresses, the cap retreat exposes first the lower sections of the southern slopes of both Argyre and Hellas. The steep topography itself generates slope winds, but during late southern winter and early spring the strong thermal contrast between the ice and the regolith generates an additional circulation component of magnitude comparable to the slope winds. When the lower section of the slope is ice-covered, the afternoon upslope wind is enhanced by the circulation cell due to the thermal contrast and the nocturnal drainage winds are attenuated. When the upper parts of the rim are covered by ice, the qualitative effect is the opposite giving rise to weak afternoon flows and amplified nocturnal downslope winds. In the case of Argyre the whole slope may be ice-covered and the surface temperatures are hence primarily determined by variation of surface pressure with altitude. The ice edge circulation component will in all likelihood amplify the surface stress and hence increase the likelihood of dust lifting. The exact pattern of the surface stress enhancement depends on the respective diurnal variations of the two circulation components. We have investigated the contributions of the slope and thermal contrast forcings using the University of Helsinki / Finnish Meteorological Institute 2-D Mars mesoscale circulation model (MMCM) with large-scale wind, surface pressure and sublimation flow estimates derived from the NASA Ames Mars GCM.
Haberle Robert M.
Murphy Ronald J.
Savijärvi Hannu
Siili T. T.
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