Extended Data Fig. 3: Results from the early Mars atmosphere model, assuming 100 mbar PCO2 at the surface.
From: Synthesis of 13C-depleted organic matter from CO in a reducing early Martian atmosphere
a. Black and yellow lines represent assumed vertical profiles of PCO2 and temperature, respectively. b. Vertical profile of CO2 photolysis rate (reaction R1). c. Calculated isotope effect (1000 ln α1) of the CO2 photolysis. The red and blue lines show the results assuming surface temperatures of 300 and 240 K, respectively. The shaded area represents the uncertainty of the calculation (see Method). d. Calculated actinic UV spectrum at each altitude. e. J(λ) values calculated for each altitude.
