We notice on the graph that the greenhouse effect, which I will refer to from now on as “warmhouse”, happens solely in the atmospheric layer extending from the surface (zero meter) up to an altitude of 1700 m; the effect goes into reverse beyond the 1700 m mark, from where the sensible heat flux also decreases with altitude.
Therefore, the warmhouse effect adheres to the trajectory of the sensible heat flux in the terrestrial atmosphere with respect to the density of energy. Or, in other words, when the density of the energy diminishes and the sensible heat flux increases, the amount of thermal energy also increases and the warmhouse effect takes place. As the sensible heat flux reverses and the amount of energy transferred decreases, the warmhouse effect terminates.
Given the circumstances detailed in the previous paragraphs, the hypothesis of an increase of the greenhouse effect due to an increase of the concentration of atmospheric carbon dioxide, without considering the incident solar energy on the surface, is erroneous.
The water vapor, with a heat capacity of 2060 J/Kg K, which is greater than the heat capacity of the air, modifies this circumstance by causing the energy density in the atmosphere to fall thus permitting the energy to be retained by the atmosphere for longer periods, and also allowing the energy to remain within quasi-stable density parameters at altitudes even higher than 3000 meters.
Carbon dioxide does not have this thermal capacity because it emits the absorbed thermal energy instantaneously (in microseconds).
Conclusion: The warmhouse effect, or “greenhouse” effect, is not caused by the gases composing the atmosphere, but by the inversion of the decline of sensible heat flux with respect to the decline of the thermal energy density in the atmosphere. As the sensible heat flux increases as the energy density diminishes, the warmhouse effect happens. Conversely, as the sensible heat flux decreases simultaneously with a decrease of the energy density, the warmhouse effect terminates. Therefore, any increase of the sensible heat flux in the atmosphere follows from an increase in the incident solar energy on the Earth's surface; consequently, any increase of the incident solar radiation on the Earth’s surface implies an increase of the energy density of any mass of air. Otherwise, the warmhouse effect, or “greenhouse” effect, would be impossible since energy is neither created nor destroyed, but only transformed.
1. Engel, Thomas and Reid, Philip. Thermodynamics, Statistical, Thermodynamics & Kinetics. 2006. Pearson Education, Inc.
2. Modest, Michael F. Radiative Heat Transfer-Second Edition. 2003. Elsevier Science, USA and Academic Press, UK.
4. Pitts, Donald and Sissom, Leighton. Heat Transfer. 1998. McGraw-Hill.
5. Wilson, Jerry D. College Physics-2nd Edition. Prentice Hall Inc. 1994.
6. Nahle, Nasif S. Heat Stored by Greenhouse Gases. Biology Cabinet. 27 April 2007.