\"1.Set the AMS CCEM to \"100%\" Sun\'s Energy, \"0%\" Albedo, \"Current (1x)\"

Question

"1.Set the AMS CCEM to "100%" Sun's Energy, "0%" Albedo, "Current (1x)" Atmospheric CO2, "1" Initial Energy, "200" Cycles, and "Introductory" Mode. Run the model. It shows that from the model's 51st cycle onward, the mean energy content in the planet's climate system was ________ energy units. [ ]0.5 [ ]2.3 [ ]5.3 [ ]10.7 2.Now change only the model's Sun's Energy setting from "100%" to "50%." This is analogous to halving the incident solar radiation. After running the model at this lower rate of solar irradiance, it is seen that the mean energy content in the planet's climate system changed to ________ energy units. [ ]0.5 [ ]2.3 [ ]5. 3 [ ]10.7 3.Comparing the two runs of the model shows that decreasing the amount of solar energy entering the planet's climate system would produce negative radiative forcing and attendant cooling. Change in the rate at which the Sun delivers energy to the planet is an example of a(n) ________ climate change. [ ]natural [ ]anthropogenic 4.Now compare the two runs of the model in terms of its response if the rate at which the Sun delivers energy to the planet had been the opposite, that is, it increased from "50%" to "100%." The comparison shows that the increased incident solar radiation would result in an increase in the amount of energy units residing in the climate system and an associated global warming. This would be an example of ________ radiative forcing of the planet's climate system. [ ]positive [ ]negative

Explanation / Answer

1. The mean energy content in the planet's climate system was 5.3 units as evident in the graph showing the corresponding values for 51st cycle onwards. The energy fluctuated around a value of 5.3 units from 51st to 200th cycle.

2. Changing the model's Sun's energy setting to 50%, we find that the mean energy content changed to 2.3 units.

3. Change in the rate at which the Sun delivers energy to the planet is an example of natural climate cycle. This change happens every 33 years due to the influence of sunspots and solar cycles.

4. An increase in incident solar radiation would result in an increase in the amount of energy and global warming. This would be an example of positive radiative forcing of the planet's climate system. The warming due to the increased radiation would result in more heat absorption by the ground and less of it leaving out to space. This would create a positive feedback cycle and hence a positive value of radiative forcing.

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