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Mars: has nitrogen escaped?

R T Brinkmann

    Science (New York, N.Y.)
    |November 26, 1971
    PubMed
    Summary
    This summary is machine-generated.

    Mars appears to have less nitrogen than expected from Earth-like outgassing. A nonthermal escape mechanism involving predissociation of exospheric nitrogen may explain this low concentration on Mars.

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    Area of Science:

    • Planetary Science
    • Atmospheric Chemistry

    Background:

    • Nitrogen is a key component of planetary atmospheres.
    • Understanding nitrogen abundance on Mars is crucial for assessing its atmospheric evolution and potential habitability.

    Purpose of the Study:

    • To investigate the discrepancy between expected and observed nitrogen concentrations in the Martian atmosphere.
    • To explore potential mechanisms responsible for low Martian nitrogen levels.

    Main Methods:

    • Comparative analysis of eddy mixing efficiency on Earth and Mars.
    • Modeling of atmospheric nitrogen escape mechanisms.

    Main Results:

    • Eddy mixing on Mars, if similar to Earth's, suggests a lower-than-expected nitrogen abundance.

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  • A nonthermal escape mechanism involving nitrogen predissociation in the exosphere is a plausible explanation for the observed low concentrations.

    • Conclusions:

    • The low concentration of nitrogen on Mars is not fully explained by terrestrial-type outgassing alone.
    • Nonthermal atmospheric escape processes are critical for understanding Mars' atmospheric composition.