class38a - Monday, Dec. 1 Syllabus, class notes, and...

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Monday, Dec. 1 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 18 The help session this week will be Wednesday at 5:00 in GRG 424.
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The greenhouse effect By blocking some of the outgoing infrared radiation and returning it to the Earth, molecules in the Earth’s atmosphere force the temperature of the surface of the Earth to rise until the outgoing flow of energy matches the incoming flow. This is the greenhouse effect. Because of the greenhouse effect, the surface of the Earth is warm enough for us to live here. Only about on half of the radiation emitted by the surface of the Earth escapes to carry heat away from the Earth. As a result, the average temperature of the surface of the Earth is warm enough for life.
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A Simpler Explanation When you put a blanket over you in bed, the blanket slows down the escape of the heat your body is generating so you are warmer. The Earth’s atmosphere acts much like a blanket, slowing down the escape of the heat we receive from the Sun.
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class38a - Monday, Dec. 1 Syllabus, class notes, and...

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