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question archive Assume the simple 1-layer greenhouse model of the atmosphere outlined in class

Assume the simple 1-layer greenhouse model of the atmosphere outlined in class

Subject:BiologyPrice: Bought3

Assume the simple 1-layer greenhouse model of the atmosphere outlined in class. Today, the average

albedo of the earth is ~ 30%; the fraction of terrestrial radiation absorbed by the greenhouse layer is

~77% and the average surface temperature of the earth is ~ 288 K. Consider the following past

scenario, ~ 3.8 billion years ago. At that time, the energy output of the sun (i.e., the solar constant) was

weaker than today by 30%, but higher CO2 levels likely provided a stronger greenhouse. Assume the

greenhouse layer captured 95% of terrestrial radiation, and assume the albedo is the same as today.

Incorporating these changes, predict quantitatively if liquid water would have been present on earth

(calculate the average surface temperature to predict this).

 

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