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(IR) Energy that is emitted in the form of
electromagnetic waves at a wavelength greater than about 750 up to approximately
30,000 nanometers. Although the earth absorbs almost all the IR, UV, and visible
radiation the hits it, the surface of the earth emits only the longest
wavelength radiation of these three, IR, in any significant amounts. It is this
re-emission of IR towards space--and its subsequent absorbance, re-emission and
scattering--that contributes to the process that heats the atmosphere. This
re-emission and subsequent heating is a part of the greenhouse effect.
[Solid
State Communications; v88; 939; 1993] [Journal of Geophysical Research; v97;
11,513, 1992.]
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