1. Over the glacial-interglacial cycles of the past 800,000 years, temperature i
ID: 291262 • Letter: 1
Question
1.
Over the glacial-interglacial cycles of the past 800,000 years, temperature increases occurred before CO2 changes. 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.
Which feedback did NOT amplify the orbital forcing that starts glacials?
Weathering feedback
Ice-Albedo feedback
Water vapor feedback
Carbon solubility feedback
3.
In which of these cases could we stimulate phytoplankton growth by adding a nutrient which is limited?
C:N:P = 106:16:1
C:N:P = 53:8:0.5
C:N:P = 212:20:2
C:N:P = 212:32:2
3.
Low-level clouds tend to ______ Earth by ______.
Cool / reflecting sunlight
Cool / trapping heat
Warm / reflecting sunlight
Warm / trapping heat
5.
High-level clouds tend to ______ Earth by ______.
Cool / reflecting sunlight
Cool / trapping heat
Warm / reflecting sunlight
Warm / trapping heat
Reflective clouds lead to more climate cooling when _____________. The figure accompanying this question shows the % of sunlight reflected by different parts of the Earth system.
they form over oceans because oceans have a much lower albedo than clouds
they form over oceans because oceans have a much higher albedo than clouds
they form over tropical land because tropical land has a higher albedo than clouds
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
100 90 80 SNOW fresh CUMULUS STRATUS 70 60 SNOW old ALTOSTRATUS CIRRUS 50 STRATUS SAND ICE 30 SOIL DESERT SAND dry wet CROPS 20 SAVANNA twvATERISOLI FOREST TER Iwou|FOREST 1MEADow 10 ? WATER wet. TFORESTExplanation / Answer
1A
CO2 is not the main driver/forcing for glacial-interglacial changes
2. B Weathering feedback
3. C C:N:P = 212:20:2
4. C Warm / reflecting sunlight
5 . D Warm / trapping heat
6 . A they form over oceans because oceans have a much lower albedo than clouds
CO2 is not the main driver/forcing for glacial-interglacial changes
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