Given an initially high concentration of CO2 and H2O, how efficient can I conceivably make a photosynthetic reaction?

I have been told that the high proportion of O₂ and CH₄ in my atmosphere are unsustainable unless constantly refreshed by an active process.

I would like to sustain the following atmospheric composition:

75.11% N₂

22.04% O₂

1.38% CH₄

0.83% Ne

0.21% CO₂

0.18% Xe

0.11% Ar

0.09% Kr

0.04% He

Molecular mass = 28.93

Rspecific = 287.38

Density at sea level = 1.08 kg/m³

Pressure at sea level = 0.81 atm

Scale height = 9717.35 m

My question:

How efficient would my photosynthetic and other carbon sequestration processes need to be to maintain this equilibrium between O₂, CH₄, CO₂ and H₂O? Keep in mind that it doesn't need to be perfect; My planet is highly geologically active and I can provide methane via volcanism (I think).

I'm trying to find examples of photosynthetic bacteria that produce a lot of methane as a byproduct of their metabolism, but nothing comes to mind right away. I'll edit it in if I find anything! I know at least if I can't find a cyanobacterium that does this, I can find a chemotrophic bacterium that does.

posted about 6 years ago

Rúnatál Davino‭

1 reputation 13 0 0 0