The statement made in that message implies that the temperature
change at earth surface is the one temperature change that is most firmly related to radiative forcing.
The reduction is controlled by the change in CO2 concentration, while the increase is controlled by the temperature
change at earth surface.
One could say too much extra
heat at the earth surface will greatly excite the hurricane safety valve (maybe too much, too often) but not enough heat will be jettisoned to the troposhere and will remain to melt glaciers, warm air currents, disrupt preciptation patterns and, in general, muck up the system
This in turn also leads to lateral growth of the Walker Cell — and therefore pole - ward migration (on both hemispheres) of the subtropical subsidence zone, where air under downward force is
compressed at the Earth surface and semi-perminent high pressure systems lead to strucutural drought and desertification.
Field intensity
distribution at the Earth surface predicted by spherical harmonic field models averaged over 400 years (a) model gufm1, 3 kyrs (b) model CALS3k.4, 7 kyrs (c), outdated model CALS7K.2 and 10 kyrs (d) model CALS10k.1 b.
The fundamental equation (1) is only valid for a solid or some liquids so the temperatures and fluxes considered are necessarily
evaluated at the Earth surface.
#Commentary by Georg Hoffmann say: >> > He continues:» It is due to water vapour, and water vapour alone, that the mean
temperature at the Earth surface is +15 °C and not -18 °C».
If co2 traps or reflects heat from the earths surface then it must also reflect or trap heat radiated from the sun in equal amounts, thereby resulting in a zero overall effect on temperature
at the earths surface, not taking into account water vapour and other demonic gasses.
'' It is due to water vapour, and water vapour alone, that the mean temperature
at the Earth surface is +15 °C and not -18 °C».
The second assumption is that most of the radiation comes either from the top of the troposphere or from the earth surface and low altitudes with a temperature following closely the temperature
at earth surface.