The increases in precipitation seen at higher latitudes are a result of increasing amounts
of water vapour in the atmosphere.
The
level of water vapour in the atmosphere is determined mainly by temperature, and any excess is rapidly lost.
The key to this narrower but much higher estimate can be found in the real world observations around the
role of water vapour in cloud formation.
The model considers all relevant feedback processes caused by
changes of water vapour, lapse - rate, surface albedo or convection and evaporation.
Adding some greenhouse gases (CO2) to a near infinite supply of greenhouse gases in the
form of water vapour available to the atmosphere has negligible effect.
The two sites referred to above start out from a clearly false premise: that scientists studying global warming have ignored the
impact of water vapour.
How CO2 affects the climate is by heating the surface air which alters the planetary albedo by melting ice sheets and increasing cloud cover by encouraging
evaporation of water vapour.
Moreover, I think that it does generate different levels
of water vapour for different types of vegetation.
[The paper was] the first to assess the
magnitude of the water vapour feedback, and was frequently cited for a good 20 years after it was published.
For instance, the concentration
of water vapour decreases rapidly above the boundary layer, and is higher in the tropics than at the poles.
My take - I think it is unreasonable to think that mainstream climate theory is ignoring the
role of water vapour in the atmosphere.
As I understand all models they all predict a water vapour based forcing caused by increased temperatures leading to increased
levels of water vapour and hence an increased greenhouse effect.
Thus it is a measure of specific humidity (the total amount
of water vapour in the parcel).
Once airborne, the salt particles would act as «cloud condensation nuclei», meaning they would facilitate the
condensation of water vapour into liquid.
The role of convection and the subsequent condensation out
of water vapour into clouds and then rainfall is currently incapable of quantification as a means of slowing or offsetting any atmospheric greenhouse effect but it certainly does those things.
The subtropical regions (e.g. the Mediterranean, North Africa and Central America) experience a drying owing to increased
transport of water vapour out of this area and an expansion of the subtropical high - pressure regions towards the poles [4].
Instead of heating a fossil fuel, his technique, called solid state ammonia synthesis, works by drawing hydrogen
out of water vapour through a charged membrane, and then reacting it with nitrogen.