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Author Question: How does the Milankovitch theory explain intermediate-term climatic events like the Pleistocene ... (Read 71 times)

anjilletteb

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on: Jul 15, 2018

How does the Milankovitch theory explain intermediate-term climatic events like the Pleistocene
  glaciation? According to Milankovitch, variations in what three parameters of Earth's orbit were
  responsible for the onset of Pleistocene glaciation? What will be an ideal response?



Question 2

Explain the origin of varves and their significance in the chronologies of glacial lake deposits. What will be an ideal response?


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coyin

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Reply #1 on: Jul 15, 2018
Answer to Question 1

According to the Milankovitch theory, there is a 100,000-year cycle of eccentricity (departure from a
perfect circle) of Earth's orbit in three areas: the precession of equinoxes, changes in axial tilt, and
orbital eccentricity. This affects the amount of solar radiation coming in at different latitudes,
sometimes resulting in cooling.



Answer to Question 2

Varves are laminated silts and clays that are deposited in glacial lakes and marine waters beneath
regions of fluctuating sea ice cover. The darker layers are deposited at the end of the summer season
when the summer's life dies and becomes incorporated in the accumulating sediment. The lighter- and
finer-grained layers are deposited during the winter when the water is still, lacking abundant life, and
receiving little sediment. Thus, each light and dark pair represents one year's accumulation.



anjilletteb

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Reply #2 on: Jul 15, 2018
Thank you


coyin

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Reply #3 on: Jul 15, 2018
No problemo


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