Energy Budget with an atmosphere

Energy Budget with an atmosphere - Energy Budget with an...

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Energy Budget with an atmosphere When you have to take into account a "real" atmosphere the analysis becomes more complicated. With no atmosphere we get some radiation reflected at the same wavelength as the input and, some absorbed which heats the surface. The heat in turn leace. The heat in turn leads to re- radiation at a wavelength greater than the input (infra red usually). With an atmosphere we now get some radiation absorbed and re-radiated (often multiple times) both before reaching the surface and after reflection/reradiation. Thus, we have absorption and scatter in the atmosphere and absorption by the surface complicating the simple picture. The earth's atmosphere is transparent in the regions where most of the sun's energy falls. A third is reflected at the same wavelength (albedo), and 2/3 reflected at i.r. wavelengths (2/9 from the surface, 4/9 transported by radiative transfer or convection. (These proportions will depend on the cloud cover too, of course.)
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For the earth all wavelengths less than 300nm are absorbed and reflected. (This is less than 1%
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Energy Budget with an atmosphere - Energy Budget with an...

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