BB,"Your post is totally devoid of any logic that I can find. I...

BB,

"Your post is totally devoid of any logic that I can find. I really don't think the lack of water vapour explains why you might get a 50 degree day in a desert. Doesn't your argument suggest that there would be less heat trapped due to zero water vapour, so it should be cooler than otherwise"?

I really don't know what to say for someone that comments on this issue so much??? During the day short wave radiation enters the Earth heating it up. The green-house gases do not absorb this short wave radiation. At night the heated surface of the Earth emits long wave radiation which the green-house gases can capture. In a desert environment this emitted long wave radiation is not trapped as there is hardly any water vapour in the atmosphere hence the rapid cooling at night.

And this BB is not an argument but fact as was my previous post on the matter.