Sentences with phrase «radiation escape altitude»
At about 90 km up, I note that the atmosphere of Venus cools down to very low temperatures in the vicinity of -112 deg C. I suspect this is the CO2 thermal radiation escape altitude there.
https://wattsupwiththat.com/ Not exact matches
At lower altitudes the repeated radiation and absorbtion acts to reduce the escape to one of diffusion.
Because the lapse rate is not zero, changing the altitude near the top of the atmosphere where infrared radiation escapes freely to space allows adjustment of the surface temperature by means of the addition of greenhouse gases.
The term «photosphere» for a star has essentially the same meaning as any of the six terms «Effective -LCB- Emission Radiation Radiating -RCB--LCB- Height Level -RCB-» for the atmosphere of a planet, being the altitude at which the gas above has an optical depth of 2/3, i.e. at which about 50 % of the radiation leaving that altitude vertically upwards escapes to space.
So the thermal energy transported to high altitudes, must be ultimately converted to Electro - magnetic radiation, in order to escape the planet.
The full picture is a bit more complex as some radiation can escape to space from all altitudes of the atmosphere and the surface.
A small localized change in surface temperature can cause a convection burst (thunderstorm) and a large increase in convection height, improving both reflection of incoming solar radiation, and conveying sensible heat to a higher altitude where it can then escape to space via radiative processes with far less interference.
The radiation in the absorption spectrum of GHG's finally escapes into outer space directly from higher altitudes where the gases are cooler and the rate of radiaton is reduced.
This interpretation is essentially the converse of the point (made years earlier by Nils Ekholm) that radiation escaping the atmosphere is controlled by the effective altitude of the radiating layer.
With sufficient warming, the same radiative transfer equations show that upward IR will rise enough for sufficient quantities to escape to space, albeit at a higher altitude than before, warmed sufficiently so that its IR emissivity allows OLR to balance incoming absorbed radiation.