I think Arrenhuis still stands on this point.
Enhanced greenhouse effect reducing outgoing long wave radiation (OLR).
So at night when the sun's direct SW energy input has gone an enhanced
GH effect should reduce cooling by 'trapping' OLR.
And In winter when days are shorter, increased 'trapping' of OLR should
slows the radiative cooling at night, thus relatively raising
temperature.
However you say:
"that this is due to CO2 and H20 saturating the same portions of the
infra-red spectrum and diminishing each other's effect? "
Surely the crucial issue here is not the diminishing effect per se, but
the vertical distribution of spectral saturation in the atmospheric
column. Because the overall temperature/altitude profile is developed
in a relativistic manner, one layer relative to it's adjacent layers.
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