GEOG 1112 Lecture Notes - Lecture 5: Mie Scattering, Specular Reflection, Diffuse Reflection
7 May 2017
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Lecture 5 | radiation earth sun (part 2) global energy balance. If an object radiates more energy than it absorbs, it cools. If it absorbs more than it radiates, it warms: review - kirchhoff"s law. Black body & selective absorbers: black body: a hypothetical body that is a perfect absorber and emitter of radiation (sun, selective absorber: any object that absorbs some types of radiation but not others. (atmosphere, clouds, glass, snow) Infrared is absorbed well by the greenhouse gases --?? absorb infrared radiation well. Greenhouse effect: water vapor, carbon dioxide, methane, no greenhouse: 18oc, greenhouse: 15oc. It is a natural phenomena: not to be confused with global warming, without it, the earth"s average temperature would be -18oc (0of) instead of 15oc (59of) Venus & runaway greenhouse effect: surface temperature: (480 oc or 900 of, 97% of atmosphere is co2, compared to 0. 040% on earth.
