(June 8, 2017 at 11:46 am)Alex K Wrote:(June 8, 2017 at 4:53 am)pocaracas Wrote: So much for back of the envelope...
You should integrate along the atmosphere how much of the IR radiation gets absorbed by the atmosphere, taking into consideration the cross section given by the percentage (or per-millage) ) of atmospheric CO2.
Considering that O2 and N2 are mostly transparent to IR, while water vapor and CO2 are not. Actually, H2O is far more absorbent, but that one falls back down as rain, while CO2 mostly stays there.
At 100% CO2 concentration, you should absorb something like 10~15% of all IR, judging by this plot (I'm just eyeballing it here):
You can then assume linearity, where 1% of CO2 in the atmosphere, leads to ~0.1% of IR being absorbed.... and just let it go on a feedback loop.
The hotter the surface gets, the more IR it emits.
I'll let Integrating along the atmosphere still count as back of the envelope. So I need the co2 density profile as a function of the total% and then integrate... hmmm
But what about the IR emission of the co2?
And now with the vorlon twist:
instead of doing math, just pick year on graph and role back CO2 level to that era.
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