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I am currently creating a program that calculates the change in observed intensity (nadir) from initial intensity within the atmosphere.

As I am studying particular compounds, a first suggestion for my work is to produce a 'forward model' based on very simplistic radiative transfer.

My problem arises from the fact that to calculate the transmission coefficient for each layer of the atmosphere (taking the atmosphere to be a series of plane parallel layers), I need to know the absorption coefficient. However, through consultation of various texts, I seem to be stuck in a somewhat cyclis process of working out the absorption coefficient and the variables for the line shape.

I am only considering collisional (pressure) broadening as my work will initially be below ~20km. The only variables I do have figures for is the line intensity for a CO line and the self-broadened and air broadened half-widths.

If anyone could help explain what needs to be derived and typical values for things such as the frequency of an ideal monocromatic wave/ whether I use the air-broadened half width or self-broadened etc I would greatly appreciate it.

Thank you

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# Calculating the absorption coefficient from little information

Can you offer guidance or do you also need help?

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