GEOL107 Lecture Notes - Lecture 14: Milankovitch Cycles, Precession, Axial Tilt
11 Oct 2018
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Document Summary
Changes in earth"s revolution about the sun and changes in earth"s rotational axis. Changes in eccentricity - earth"s revolution about the sun. Changes in eccentricity of earth"s revolution about the sun over time period of about 100,000 years. Earth"s revolution about the sun becomes more/less elliptical. Changes in eccentricity change the amount of solar radiation reaching earth from sun. Changes in obliquity - earth"s rotational axis. Changes in obliquity of earth"s rotation axis with respect to sun - over time periods on order of 40,000 years. Earth"s angle of obliquity varies between 22. 5 and 24. 5 degrees. Changes in obliquity change intensity of solar radiation reaching. Precession of earth"s rotational axis - over time periods on order of 20,000 years - earth"s rotational axis precesses. Changes in precession change intensity of solar radiation reaching earth from sun. Together, these cycles acting over tens to hundreds of thousands of years can produce changes in earth"s climate (think glacial/interglacial time periods)
