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Lecture 17 Milankovitch cycles

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Lecture 17 Milankovitch cycles

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    1. Lecture 17—Milankovitch cycles Abiol 574

    5. Q: What makes eccentricity vary? A: The gravitational pull of the other planets

    6. Eccentricity Variations Current value: 0.017 Range: 0-0.06 Period(s): ~100,000 yrs ~400,000 yrs

    9. Q: What makes the obliquity and precession vary? A: First, consider a better known example…

    12. Obliquity Variations Current value: 23.5o Range: 22o-24.5o Period: 41,000 yrs

    13. Precession Variations Range: 0-360o Current value: Perihelion occurs on Jan. 3 ? North pole is pointed almost directly away from the Sun at perihelion Periods*: ~19,000 yrs ~23,000 yrs

    20. NH Insolation vs. Time

    21. O isotopes—the last 900 m.y.

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