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  • M-GITM datasets used for a modeling study of the mean impacts of subgrid-scale gravity waves on thermospheric velocities and temperatures at Mars.

    work
    Creator:
    Roeten, K. J. and Bougher, S. W.
    Description:
    In order to better understand the large-scale impacts of smaller-scale gravity waves in the upper atmosphere of Mars, a modern whole atmosphere, nonlinear, non-orographic, spectral gravity wave parameterization scheme (Yigit et al., 2008) has been added to the ground-to-exosphere 3-D general circulation model, M-GITM (Bougher et al., 2015), which previously did not account for the effects of this physical process. New atmospheric simulations have been run for cases which did and did not utilize this gravity wave parameterization as well as for cases designed to test the sensitivity of certain adjustable parameters within the scheme. After including the gravity wave parameterization scheme into M-GITM, large impacts are found on the simulated mean thermospheric horizontal velocities and temperature structure, especially within the altitude range of 90-170 km (Roeten et al., 2022). The most notable of these impacts include a reduction in speed of the thermospheric easterlies in the summer hemisphere as well as overall cooling, on average, at altitudes above 120 km., Simulations were run for two different seasons at Mars, a solstice (Ls=270) and an equinox (Ls=180). The output from these simulations have been averaged over all local times over a 15-day time period, starting on the day of the solstice or equinox. The output has also been zonally averaged over all longitudes. Files containing these zonally and temporally averaged files are named starting with “MGITM_ZonalAvg”. Both solstice and equinox cases have been simulated once without including the gravity wave parameterization (“nogw”) and once with the gravity wave parameterization included (“withgw”). Additional simulations of the Ls=270 solstice have been done individually adjusting the horizontal wavelength and maximum source flux parameters within the gravity wave scheme. , and Other M-GITM simulations have also been provided in a different format. These M-GITM simulations are ‘flythroughs’ of model output, extracted along the same trajectory path of the MAVEN spacecraft, which allows for better data-model comparisons with in-situ MAVEN/NGIMS (Neutral Gas and Ion Mass Spectrometer) observations. These simulations have been done for three different NGIMS observational campaigns, both for cases that include and do not include the effects of gravity waves. Output from these simulations has NOT been averaged; instead, output from each simulated MAVEN orbit is included within the file. These files are named starting with “MGITM_TempExtraction” or “MGITM_WindExtraction” based on whether the MGITM flythrough was designed to be compared to MAVEN/NGIMS temperature or wind profiles, respectively.
    Keyword:
    Mars, M-GITM, MAVEN, and Mars upper atmosphere
    Citation to related publication:
    Roeten, K. J., Bougher, S. W., Yigit, E., Medvedev, A. S., Benna, M., Elrod, M. K. (2022). Impacts of gravity waves in the Martian thermosphere: The Mars Global Ionosphere- Thermosphere Model coupled with a whole atmosphere gravity wave scheme. Journal of Geophysical Research: Planets. In preparation.
    Discipline:
    Science