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Periodic insolation variations on Mars.

B C Murray, W R Ward, S C Yeung

    Science (New York, N.Y.)
    |May 11, 1973
    PubMed
    Summary
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    New Mars climate data reveals previously unknown insolation variations. These variations, driven by orbital eccentricity, show periodicities of 95,000 and 2,000,000 years, potentially recorded in polar layered deposits.

    Area of Science:

    • Planetary Science
    • Climate Science
    • Geology

    Background:

    • Orbital variations significantly influence planetary climate.
    • Brouwer and Van Woerkom (1950) established the theory of periodic variations in eccentricity.
    • Martian polar layered deposits offer insights into past climate conditions.

    Purpose of the Study:

    • To identify and characterize previously unrecognized insolation variations on Mars.
    • To investigate the potential recording of these variations in Martian polar deposits.
    • To analyze the periodicities associated with Martian orbital eccentricity.

    Main Methods:

    • Analysis of astronomical theories on orbital variations.
    • Examination of geological evidence in Martian polar layered deposits.

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  • Spectral analysis to identify periodicities in insolation data.

    • Main Results:

    • Discovery of annual insolation variations on Mars linked to orbital eccentricity.
    • Identification of 95,000-year and 2,000,000-year periodicities in annual insolation.
    • Detection of additional north-south seasonal insolation variations with 51,000-year and 2,000,000-year periodicities.

    Conclusions:

    • Martian insolation is subject to complex periodic variations.
    • These variations may be preserved in Martian polar layered deposits, providing a climate record.
    • Understanding these cycles is crucial for interpreting Mars' climate history.