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Mars: an evolving atmosphere.

M B McElroy

    Science (New York, N.Y.)
    |January 28, 1972
    PubMed
    Summary
    This summary is machine-generated.

    Photochemical reactions in Mars's exosphere create fast atoms, significantly impacting atmospheric evolution. These reactions drive large escape fluxes, crucial for understanding Mars's atmospheric loss.

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    Area of Science:

    • Planetary Science
    • Atmospheric Chemistry
    • Astrobiology

    Background:

    • Mars possesses an exosphere where photochemical reactions occur.
    • These reactions involve oxygen, carbon, and nitrogen atoms.
    • Atmospheric escape is a key process in planetary evolution.

    Purpose of the Study:

    • To investigate the role of photochemical reactions in the Martian exosphere.
    • To quantify the escape fluxes of key elements from Mars.
    • To understand the implications for Martian atmospheric evolution.

    Main Methods:

    • Analysis of photochemical processes in the Martian exosphere.
    • Modeling of atomic escape fluxes.
    • Comparison of outgassing rates with terrestrial planets.

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    Main Results:

    • Photochemical reactions produce fast oxygen, carbon, and nitrogen atoms.
    • Significant escape fluxes of these elements are observed.
    • Relative outgassing rates of H(2)O and CO(2) are comparable to Earth, but absolute rates are lower.
    • Nitrogen constitutes less than 1% of the current Martian atmosphere.

    Conclusions:

    • Photochemical reactions are critical drivers of atmospheric evolution on Mars.
    • Atmospheric escape significantly influences the long-term composition of the Martian atmosphere.
    • Understanding these processes is vital for comparative planetology.