tisdag 25 december 2012
Evidence of Zero Greenhouse Gas Effect 1
The above plots of temperature vs pressure in planetary atmospheres indicate that the surface temperature of a planet with an atmosphere is determined by its blackbody temperature, as the temperature of the atmosphere at a pressure of about 0.3 bar attained at a certain altitude and then moderated by a certain lapse rate (less than g/c_p where g is the gravitational acceleration and c_p the specific heat of the atmosphere at constant pressure) to set the surface temperature. The blackbody temperature would then be the minimum temperature of the atmosphere attained at a pressure of about 0.3 bar, and the planet surface temperature would be independent of the composition of the atmosphere, as long as the lapse rate would not be subject to change.
The greenhouse effect, supposedly influencing the temperature of the Earth surface, as an effect depending on the radiative properties of the atmosphere, would thus be zero. In particular, with a given lapse rate the Earth surface temperature would be independent of the amount of CO2 in the atmosphere.
The rationale would be that a gas at a pressure of more than 0.3 bar radiates like a blackbody. Is this true?