In concept, this claim is that downward radiation from the atmosphere minus
upward radiation from the atmosphere = half the total planetary absorbed solar radiation.
Not exact matches
When the team looked at the overall balance between the
radiation upward from the surface of the ice sheet and the
radiation both
upward and downward
from the upper levels of the
atmosphere across all infrared wavelengths over the course of a year, they found that in central Antarctica the surface and lower
atmosphere, against expectation, actually lose more energy to space if the air contains greenhouse gases, the researchers report online and in a forthcoming Geophysical Research Letters.
This quantity represents the difference in the intensity of the long - and short - wave infrared
radiation at these two wavelengths that travels
upward from the
atmosphere to the satellite, and it is traditionally used to differentiate between water and ice clouds.
He uses Kirchhoff's law and the two energy balances (ground to lower
atmosphere, upper
atmosphere to space) to derive the result: The long wave
upward radiation from the surface is limited to 1.5 times the short wave downward
radiation from the Sun.
The internal kinetic energy is taken as the
upward long wave energy flux at the top of the
atmosphere, and the potential energy is the
upward radiation flux
from the surface.
The pioneer was W.H. Dines, who gave the first explicit model including infrared
radiation upward and downward
from the
atmosphere itself, and energy moved up
from the Earth's surface into the
atmosphere in the form of heat carried by moisture, Dines (1917); Hunt et al. (1986) gives a review.
Without the heat flow
from the surface there would be no back
radiation since it is the
upward radiation, convection and heat conduction that are responsible for the heating of the
atmosphere which, in turn, results in the emission of
radiation by
atmosphere.
On top of the ocean heating, we can look at the outgoing
radiation from the
atmosphere, by satellite, to see that frequencies associated with water vapor and CO2 have reduced
upward emissions.
The surface provides «surface forward
radiation» or «surface
upward radiation» or «surface away -
from - the - surface long - wavelength EM
radiation» to the
atmosphere (350 W / m).
You agree that SOME of the downward pointing
radiation comes
from the low reaches of the
atmosphere but I am saying ALL of the downward
radiation measurable at the surface is
from the low reaches (just 10's of meters) EXCEPT (minus) that which can and does go
upward to space and that is called the «window» frequencies
upward IR
radiation.
That is why I took the time to think of a definitive experiment of a Fresnel lens (here) to prove it, one way or the other, whether 324 ± Wm - 2 of downwelling
radiation is actually and always flowing
from the
atmosphere down on the surface, or, is there merely a much smaller portion of
radiation always flowing
upward that you could focus and heat something with a lens looking downward.
Looking specifically at the exchange between surface and
atmosphere, the
radiation rates are 350 W / m ^ 2 up
from surface to
atmosphere and 324 W / m ^ 2 down
from atmosphere to surface, for a net 26 W / m ^ 2
upward.
This just says that Solar
radiation absorbed at the surface + downward atmospheric
radiation = surface
upward radiation + convection
from the surface to the
atmosphere.