The Planet Mean Surface Temperature Equation: Tmean = [ Φ (1-a) S (β*N*cp)¹∕ ⁴ /4σ ]¹∕ ⁴

Plus the introduction to the Reversed Milankovitch Cycle. Click above on the box for more

Earth's atmosphere has only traces of carbon dioxide CO2 gas content

CO2 content in Earth's atmosphere is measured to be some 400 ppm.

400 parts per million is one part per 1.000.000 /400 = 2.500

So we have one molecule of CO2 for every 2.500 molecules of air.

Or to make it even more clear: 1 /2.500 = 0,0004 or 0,04 %

Now let's compare the 0,04% CO2 content in Earth's atmosphere with the water vapor content of about 1% on average.

0,04% CO2 /1% H2O = 0,04

or one molecule of CO2 for every 25 molecules of H2O in Earth's atmosphere.

One may say there are still too many CO2 molecules.

But Earth's atmosphere is very thin, it is an almost transparent atmosphere in both ways - in and out.

It is not only the CO2% content in the Earth's atmosphere general content that matters, but we have also to consider how many CO2 molecules are in Earth's atmosphere in total.

If Earth's atmosphere were consisted from the actually existing CO2 molecules only, the atmospheric pressure on the Earth's surface would have been 0,0004 bar.

 

 

From Wikipedia:

For Planet Mars

Atmosphere[10][15]

Surface pressure 0.636 (0.4–0.87) kPa 0.00628 atm

 

Composition by volume

 

95.97% carbon dioxide

 

1.93% argon

1.89% nitrogen

0.146% oxygen

0.0557% carbon monoxide

0.0210% water vapor

0.0100% nitrogen oxide

0.00025% neon

0.00008% hydrogen deuterium oxide

0.00003% krypton

0.00001% xenon

Mars' and Earth's carbon dioxide CO2 gas planet atmosphere partial pressure comparison

Mars' and Earth's carbon dioxide CO2 gas planet atmosphere partial pressure comparison

 

The partial carbon dioxide pressure in Earth's atmosphere is 0,0004 bar.

The atmosphere pressure on Mars is 0,636 kPa or 0,00636 bar.

The partial carbon dioxide pressure in Mars' atmosphere is

0,00636 bar * 95,97% CO2/100% = 0,00610 bar

 

Let's compare: Mars CO2 /Earth CO2 = 0,00610 bar /0,0004 bar = 15,26

Conclusion:

Mars has 15,26 times higher CO2 partial pressure content.

What it means? It means that per planet surface square meter Mars has

15,26 times more than Earth carbon dioxide molecules.

 

From Wikipedia for planet Mars:

Atmosphere[10][15]

Surface pressure 0.636 (0.4–0.87) kPa 0.00628 atm

Composition by volume

95.97% carbon dioxide

1.93% argon

1.89% nitrogen

0.146% oxygen

0.0557% carbon monoxide

0.0210% water vapor

0.0100% nitrogen oxide

0.00025% neon

0.00008% hydrogen deuterium oxide

0.00003% krypton

0.00001% xenon

The Earth seen from Apollo 17

Mars true color