Lab 7( The real one)
docx
keyboard_arrow_up
School
Georgia State University *
*We aren’t endorsed by this school
Course
1112
Subject
Geography
Date
Apr 3, 2024
Type
docx
Pages
4
Uploaded by UltraTroutMaster1168
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
2
glacial-interglacial cycles?
Because CO2 is more soluble in glacial cycle compared to
interglacial cycles.
Q22: Compared to the present-day global average temperature, how much lower was the global average temperature 21,000 years ago?
5.4degrees Celsius
Q23: How much did CO concentrations increase from 21,000 years ago to 1500 A.D?
2
95ppm
Q24: Why have CO
concentrations increased by at least another 100 ppm from 1500 2
A.D. to the present?
CO2 concentration increased because of fossil fuel burning.
Q25: Why was the sea level so low? If the water wasn’t being stored in the oceans, where was it being stored?
Trapped in ice.
Q26: The lower sea level also contributed to a higher albedo for Earth during the LGM
(0.32) compared to today (0.30). How exactly does a decrease in sea level cause in an
increase in albedo? Hint: Look at Florida and turn off and on the Last Glacial Maximum
layer. It also wouldn’t hurt if you referred back to the LGM Albedo worksheet in
the
temperature model
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
you examined in Lab 5 (Global Surface Temperature).
Less water higher albedo.
Q27: Why do glacial periods occur?
A large tilt in Earth's axis coupled with the Earth being farthest from the Sun
during the Northern Hemisphere summer
Q28: What happens when Earth transitions from a glacial period to an interglacial
period?
Sea ice melts → sea level increases → oceans absorb more CO2 → ocean
temperatures increase → further melting of sea ice
Q29:
How does an interglacial period differ from a glacial period?
An interglacial period has higher temperatures, higher CO2 concentrations, higher
sea level, and less ice cover than a glacial period