The Climate Machine:
The Greenhouse Effect
Evidence for the greenhouse effect can be seen in:
the longwave spectral opacity
of the atmosphere and
the difference between the observed surface temperature of
the Earth and the effective radiating temperature as produced by a simple
Due to the greenhouse effect, the surface
temperature (Ts) is greater than the effective radiating temperature (Te)
by an amount given by,
Ts = Te
(2 / (2-e) )1/4
where the emissivity of the atmosphere is given by e. The
calculation is explained here.
For optically thick atmospheres (several optical depths)
the calculation can be extended further.