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  • Lunar and Planetary Science and Exploration  (7)
  • Astrophysics  (1)
  • 1
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    Volatile Cycling and Layering on Mars: Observations, Theory and Modeling (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: With the release of Mars Odyssey Gamma Ray Spectrometer (GRS) results, which indicate the presence of vast reservoirs of near-surface ice in the martian polar regions, we are presented with an exquisite dilemma. These deposits, which are present as far down as 60 deg. latitude in both hemispheres, are consistent with the suggestion of thermal models that ice will be best protected in these extended regions during periods of higher obliquity. However, the current paradigm regarding the placement of these deposits, i.e., diffusive deposition of water vapor, appears to be inconsistent with the large volume mixing ratios (approx. 70%) inferred from the GRS data. This apparent conflict argues that diffusion alone cannot be the primary mechanism for the creation of these reservoirs, and that an alternate, large-scale process should be considered.
    Keywords: Astrophysics
    Type: Sixth International Conference on Mars; LPI-Contrib-1164
    Format: text
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  • 2
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    Polar and Non-Polar Layers on Mars: A Single Mechanism for Formation? (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The recent discovery of vast quantities of near-subsurface ice in both polar regions of Mars by the Mars Odyssey Gamma Ray Spectrometer (GRS) has presented us with an interesting quandary. On one hand, these deposits, found poleward of 60 deg in both hemispheres, are consistent with thermal models suggesting ice will be best protected in these regions during periods of high obliquity. On the other hand, the current paradigm regarding the placement of these deposits, i.e., diffusive deposition of water vapor, appears to be inconsistent with the large volume mixing ratios (approx. 90%) inferred from the GRS data. This incongruity argues that diffusion alone cannot be the primary mechanism for the creation of these reservoirs, and that an alternate, large-scale process should be considered.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Third International Conference on Mars Polar Science and Exploration; LPI-Contrib-1184
    Format: application/pdf
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  • 3
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    Mars Observer PMIRR: Applications to Atmospheric Transport (1993)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
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  • 4
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    The Exploration of Martian Climate, Meteorology and Evolution of Atmosphere (1997)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
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  • 5
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    Return to the Poles of Mars (2000)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: The loss of the Mars Polar Lander (MPL) raises the question of when NASA might attempt a return mission to the Polar Regions. This paper describes future opportunities for recovering the science lost with MPL. Additional information can be found in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: International Conference on Mars Polar Science and Exploration; 129; LPI-Contrib-1057
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  • 6
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    Mars Climate Orbiter's Investigation of the Atmosphere and Polar Caps (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The Mars Climate Orbiter (MCO) is now on its way to Mars. It carries an atmospheric sounder whose observations will provide a continuous, global data set on weather and climate for a full Martian year. This paper describes the observation strategy and anticipated results from the Pressure Modulator Infrared Radiometer (PMIRR). PMIRR will measure vertical profiles of atmospheric infrared radiance in the 7 to 50 micron wavelength region extending from the surface of Mars to 80-km altitude. The observations have a vertical resolution of 5 km, or one-half the atmospheric scale height. From these radiance profiles we will retrieve profiles of atmospheric temperature, pressure, and the amounts of dust, condensates and water vapor. In addition, PMIRR will measure the radiative balance of the polar regions of Mars in an effort to better understand the short-term climate variability of the planet. The information obtained with PMIRR on MCO will be complementary to data obtained by the Thermal Emission Spectrometer (TES) and Radio Science (RS) experiments on the Mars Global Surveyor. A major emphasis of our research will be the assimilation of PMIRR data into numerical models of the Martian atmosphere. Assimilation schemes, of which several are currently in development, will permit the extension of measurements to spatial and temporal scales and to phenomena (e.g. winds) not observed directly by PMIRR.
    Keywords: Lunar and Planetary Science and Exploration
    Type: The Fifth International Conference on Mars; LPI-Contrib-972
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  • 7
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    Interannual Variability of Dust and Ice in the Mars Atmosphere: Comparison of MRO Mars Climate Sounder Retrievals with MGS-TES Limb Sounding Retrievals (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Dust and ice play important roles in Martian atmospheric dynamics on all time scales. Dust loading in particular exerts an important control on atmospheric temperatures and thereby on the strength of the atmospheric circulation in any given year. We present the first comparisons of MGS-TES aerosol opacity profiles with MRO-MCS aerosol opacity profiles. While the differences in vertical resolution are significant (a factor of 2), we find good agreement at particular seasons between nightside zonal average dust opacity profiles from the two instruments. Derived water ice opacities are likewise similar but show greater variability.
    Keywords: Lunar and Planetary Science and Exploration
    Type: EPSC-DPS Joint Meeting 2011; Oct 02, 2011 - Oct 07, 2011; Nantes; France
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  • 8
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    Interannual Similarity in the Martian Atmosphere During the Dust Storm Season (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We find that during the dusty season on Mars (southern spring and summer) of years without a global dust storm there are three large regional-scale dust storms. The storms are labeled A, B, and C in seasonal order. This classification is based on examining the zonal mean 50 Pa (approximately 25 km) daytime temperature retrievals from TES/MGS and MCS/MRO over 6 Mars Years. Regional-scale storms are defined as events where the temperature exceeds 200 K. Examining the MCS dust field at 50 Pa indicates that warming in the Southern Hemisphere is dominated by direct heating, while northern high latitude warming is a dynamical response. A storms are springtime planet encircling Southern Hemisphere events. B storms are southern polar events that begin near perihelion and last through the solstice. C storms are southern summertime events starting well after the end of the B storm. C storms show the most interannual variability.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN40094 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 43; 12; 6111-6118
    Format: text
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