Atmospheric processes affecting methane on Mars

It is currently uncertain as to whether methane exists on Mars. Data from the Curiosity Rover suggests a background concentration of few tenths parts per billion whereas data Trace Gas Orbiter suggest an upper limit twenty trillion. If Mars then we do not understand fully physical and chemical processes affecting its lifetime. Atmospheric models over-estimate in lifetime by factor around six hundred compared with earlier observations. In present work assume value estimate uncertainty atmospheric chemistry mixing our column model 1D TERRA. Results that these can only explain ~sixteen lowering This implies if additional, unknown are required observed