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Mars: is nitrogen present?

A Dalgarno, M B McElroy

    Science (New York, N.Y.)
    |October 9, 1970
    PubMed
    Summary
    This summary is machine-generated.

    Mars

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    Area of Science:

    • Planetary Science
    • Atmospheric Science
    • Spectroscopy

    Background:

    • Understanding the atmospheric composition of Mars is crucial for assessing its potential habitability.
    • The ultraviolet (UV) dayglow emissions provide valuable insights into atmospheric processes and constituent abundances.

    Purpose of the Study:

    • To constrain the mixing ratio of nitrogen to carbon dioxide in the Martian atmosphere.
    • To investigate the implications of atmospheric mixing on the interpretation of UV dayglow observations.

    Main Methods:

    • Analysis of observational data from Mars' ultraviolet dayglow.
    • Atmospheric modeling to determine the consistency of different nitrogen to carbon dioxide ratios with the observed data.

    Main Results:

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    • A uniformly mixed atmosphere with a nitrogen to carbon dioxide mixing ratio of 5 percent is consistent with UV dayglow data.
    • If atmospheric eddy diffusion is comparable to Earth's, this ratio limit decreases to below 0.5 percent.

    Conclusions:

    • The study provides an upper limit for the carbon dioxide abundance in the Martian atmosphere based on UV dayglow.
    • Atmospheric mixing characteristics significantly influence the interpretation of remote sensing data for planetary atmospheres.