The comments to a previous post concern the central question of CO2 alarmism if the measured radiation spectra underlying the Kiehl-Trenberth's energy budget describe reality or fiction.
The is a question of measurement technique since the spectra are constructed by reading a certain instrument. Let us consider the principle of such an instrument in the form of an ideal blackbody B in radiative contact with an object O. The rate of radiative energy transfer E between the bodies is given by Stefan-Boltzmann's law
- E = alpha x gamma x T_B^4 - epsilon x gamma T_O^4
- E = epsilon x (T_B^4 - T_O^4).
We understand the the atmospheric radiation spectra are constructed assuming emissivity = 1 from temperature readings, and as such represent fiction rather than reality, because the emissivity can be much smaller than 1, as seems to be the case with atmospheric CO2.