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  • Lunar and Planetary Science and Exploration  (2)
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  • 1
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    Atmospheric Tides in Gale Crater, Mars (2015)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Atmospheric tides are the primary source of daily air pressure variation at the surface of Mars. These tides are forced by solar heating of the atmosphere and modulated by the presence of atmospheric dust, topography, and surface albedo and thermal inertia. This results in a complex mix of sun-synchronous and nonsun- synchronous tides propagating both eastward and westward around the planet in periods that are integer fractions of a solar day. The Rover Environmental Monitoring Station on board the Mars Science Laboratory has observed air pressure at a regular cadence for over 1 Mars year and here we analyze and diagnose atmospheric tides in this pressure record. The diurnal tide amplitude varies from 26 to 63 Pa with an average phase of 0424 local true solar time, while the semidiurnal tide amplitude varies from 5 to 20 Pa with an average phase of 0929. We find that both the diurnal and semidiurnal tides in Gale Crater are highly correlated to atmospheric opacity variations at a value of 0.9 and to each other at a value of 0.77, with some key exceptions occurring during regional and local dust storms. We supplement our analysis with MarsWRF general circulation modeling to examine how a local dust storm impacts the diurnal tide in its vicinity. We find that both the diurnal tide amplitude enhancement and regional coverage of notable amplitude enhancement linearly scales with the size of the local dust storm. Our results provide the first long-term record of surface pressure tides near the martian equator.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN40231 , Icarus (ISSN 0019-1035) (e-ISSN 2643-2643); 268; 37-49
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mars Science Laboratory Observations of the 2018/Mars Year 34 Global Dust Storm (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Mars Science Laboratory Curiosity rover observations of the 2018/Mars year 34 global/planet-encircling dust storm represent the first in situ measurements of a global dust storm with dedicated meteorological sensors since the Viking Landers. The Mars Science Laboratory team planned and executed a science campaign lasting approximately 100 Martian sols to study the storm involving an enhanced cadence of environmental monitoring using the rover's meteorological sensors, cameras, and spectrometers. Mast Camera 880-nanometer optical depth reached 8.5, and Rover Environmental Monitoring Station measurements indicated a 97 percent reduction in incident total ultraviolet solar radiation at the surface, 30 degrees Kelvin reduction in diurnal range of air temperature, and an increase in the semidiurnal pressure tide amplitude to 40 pascals. No active dust-lifting sites were detected within Gale Crater, and global and local atmospheric dynamics were drastically altered during the storm. This work presents an overview of the mission's storm observations and initial results.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN66591 , GSFC-E-DAA-TN65722 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 1; 71-79
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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