Lab 7( The real one)

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Georgia State University *

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1112

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Geography

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Apr 3, 2024

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docx

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Lab 7 Perihelion represent the earth is closest to the sun and aphelion represent that when the earth is furthest from the sun. Q9: In the present day, at what time of year do perihelion and aphelion occur? Perihelion occurs during January 3rd, and Aphelion occurs during July 4th. Q10: What is the approximate length of the tilt cycle (i.e. how many years elapse between periods of minimum tilt or how many years elapse between periods of maximum tilt)? The approximate length of tilt cycle 40,000yrs. Q11: Precession relates to a feature of the Earth’s tilt. What do you notice is happening to the Earth’s tilt when <Precession> is highlighted that could explain what this term means? Earth tilt when precession is happening the change of the rotation of the earth axis. Q12: What is the approximate length of the precession cycle (i.e. how many years occurbetween periods of minimum precession or how many years elapse between periods of maximum precession?) The approximate length of the precession is 26,000 years. Q13: Why did the high latitudes of the Northern Hemisphere receive such a small amount of insolation during the summers approximately 116,000 years ago? 116,000 years ago, summer isolation dropped from 486.5 to 397.6wm. Q14: How did Earth’s eccentricity change from 126,000 years ago to 116,000 years ago? Earths eccentricity increased.
Q15: How did Earth’s obliquity change from 126,000 years ago to 116,000 years ago? Earths eccentricity decreased. Q16: When did aphelion occur? Maybe slow down Earth’s orbit to read the words on the simulator. Aphelion occurs January 3 during summer season. Q17: When did perihelion occur? You will probably need to slow down Earth’s orbit to read the words on the simulator. Perihelion occurs July 4 during the winter season. Q18: Considering changes in eccentricity, obliquity, and precession, why did the high latitudes of the Northern Hemisphere receive such a small amount of insolation during the summers approximately 116,000 years ago? High Eccentricity and low obliquity. Q19: What is the relationship between temperature and CO concentrations during 2 glacial-interglacial cycles? Lower CO2 concentration during the glacial cycles. During the interglacial cycles CO2 concentration is higher. Q20: What is the difference in CO concentrations in parts per million (ppm) between 2 maximums in interglacial periods (i.e. peaks in the graph) and maximums in glacial periods (i.e. valleys in the graph)? About 100 ppm Q21: Why do atmospheric CO concentrations increase and decrease so much during
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