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  • Other Sources  (3)
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  • 1
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    On the Potential Impact of Daytime Surface Sensible Heat Flux on the Dissipation of Martian Cold Air Outbreaks (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-08-16
    Description: The Martian daytime soil surface temperature is governed primarily by the net irradiance balance and surface soil heat flux. Thus the outbreak of a cold air mass generates increased sensible heat flux that is conducive to daytime dissipation of the cold air mass thermal characteristics. Conceptual and scaling evaluations of this dissipation are provided while comparison is made with similar situations on Earth. It is estimated that sensible heat flux contribution to the dissipation of the original thermal structure of the cold air could be three times larger than the corresponding situation on Earth. Illustrative numerical model simulations provide scaling of the potential impact on the dissipation of cold air masses for various combinations of background wind speed and latitudes.
    Keywords: Lunar and Planetary Exploration
    Type: Journal of the Atmospheric Sciences; 54; 1544-1549
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Scaling evaluation of the effect of surface characteristics on potential for deep convection over uniform terrain (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The effect of surface characteristics on the daytime change in the potential for development of deep convection resulting from surface flux of heat and moisture is evaluated by conceptual, scaling, and numerical modeling approaches. It is shown that deep convection depends significantly on the Bowen ratio; for smaller Bowen ratio, the thermodynamic potential for deep convection increases. The elevation and the intensity of the capping stable layer have an opposing impact on deep convection: increasing moisture accumulation through evapotranspiration was supportive but was counteracted by the enhancement of dry entrainment. Based on an approximnate treatment of the effect of cloudiness on solar irradiance, it was found that development of fair weather cumulus has a secondary effect on deep convection potential. Observational and operational aspects of the influence of surface conditions on evapotranspiration and development of deep convection are presented.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 123; 2; p. 383-400
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical Model Studies of the Martian Mesoscale Circulations (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Studies concerning mesoscale topographical effects on Martian flows examined low-level jets in the near equatorial latitudes and the dynamical intensification of flow by steep terrain. Continuation of work from previous years included evaluating the dissipation of cold air mass outbreaks due to enhanced sensible heat flux, further sensitivity and scaling evaluations for generalization of the characteristics of Martian mesoscale circulation caused by horizontal sensible heat-flux gradients, and evaluations of the significance that non-uniform surface would have on enhancing the polar CO2 ice sublimation during the spring. The sensitivity of maximum and minimum atmospheric temperatures to changes in wind speed, surface albedo, and deep soil temperature was investigated.
    Keywords: Lunar and Planetary Exploration
    Type: NASA-CR-200730 , NAS 1.26:200730
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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