1. Over the glacial-interglacial cycles of the past 800,000 years, temperature i
ID: 291329 • Letter: 1
Question
1.
Over the glacial-interglacial cycles of the past 800,000 years, temperature increases occurred before CO2changes. This suggests:
CO2 is not the main driver/forcing for glacial-interglacial changes
Temperature responses are due to forcing from orbital cycles
Positive feedbacks are necessary to continue warming and cooling trends
All of the above
None of the above
2.
Low-level clouds tend to ______ Earth by ______.
Cool / reflecting sunlight
Cool / trapping heat
Warm / reflecting sunlight
Warm / trapping heat
3.
More algae growth leads to ____ low clouds, ____ warming and a _____ feedback during ice ages.
less; more; positive
more; less; positive
more; more; positive
more; less; negative
4.
Dansgaard-Oeschger events were rapid ______ events, identified in ice core data by more _______ ?18O values. (note: 'enriched' means higher or less negative, 'depleted' means lower or more negative)
cooling; depleted
warming; depleted
warming; enriched
cooling; enriched
5.
When do scientists expect the next glacial to start, assuming no anthropogenic CO2 emissions?
In the next 10,000 years
In 100,000 years
Never
Any day now
In ~30,000 years
6.
Which of the following time-scales of change in Earth's orbit does not appear to have major implications for climate change during the Pleistocene Epoch?
5600 years
26,000 years
41,000 years
100,000 years
400,000 years
7.
The Holocene climate maximum was
warmer than today due to higher levels of greenhouse gases
warmer than today due to plate tectonics
colder than today due to changes in Earth's orbital configuration
warmer than today during the summer at high latitudes due to changes in Earth's obliquity
ACO2 is not the main driver/forcing for glacial-interglacial changes
BTemperature responses are due to forcing from orbital cycles
CPositive feedbacks are necessary to continue warming and cooling trends
DAll of the above
ENone of the above
Explanation / Answer
ans 1) option D -All of the above
explanation- if temperature increase have occured before CO2 changes then it shows that CO2 is not the major factor for glacial- interglacial changes.
orbital cycles not only affects the average temperature of the earth but also how prominent the seasons are.
posititve feedback shows high climate sensitivity which affects warming and cooling trends.
so all the options are suggested by the statement given in the question.
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