- Evaporation at the ocean surface driven by incoming radiation generates cooling of the warm atmosphere above the surface.
- Warm air rises by bouyancy under expansion and cooling to TOA where it releases heat by condensation for further radiation to outer space.
- Cool air descends from TOA under compression and warming completing a thermodynamic refrigerating cyclic process.
torsdag 17 juni 2010
The Atmosphere as Refrigerator
The previous posts lead us to view the thermodynamic action of the atmosphere to be similar to that of a refrigerator:
In addition, some incoming heat is returned by radiation. If the radiation is blocked, more or less, by greenhouse gases, the refrigerator process must intensify to maintain heat balance. This requires more evaporation and thus more cooling of the atmosphere above the ocean surface.
The atmosphere will thus act like a refrigerator giving additional cooling under increased energy input. More greenhouse gases will thus cause global cooling!
How much cooling? Assume that now 1/4 of incoming heat is returned by radiation and 3/4
by the thermodynamic refrigerator process at a decrease of the lapse rate of 3 K/km from 10 to 7 K/km. Blocking the radiation fully would then require a further reduction of lapse by 1 K/km to 6K/km corresponding to a decrease of surface temperature by 5 K.
If the radiation was blocked by 1% the decrease of global temperature would be 0.05 K. Climate sensitivity could thus be estimated to - 0.05 K. To be compared with IPCC's + 1.5 to + 4.5 K.