Dear community,

I have measurements of pressure (p), temperature (T) and relative humidity (i.e. water vapour content, RH) and I'd like to know if there's a simple way to calculate atmospheric transmissivity from these quantities, and for the transverse (i.e. horizontal, same altitude) direction. I've looked at several atmospheric radiation models such as Modtran but these are all for depth-integrated calculations, and it seems to me that there must be a simple way to do this if we don't need to take into account the varying optical properties of the different atmospheric layers. Are these three measurements (and assumptions for the concentrations of other atmospheric gases such as 400 ppm CO2) sufficient? I'm specifically interested in transmission in the thermal infrared band (7.5-13.5 microns). Thanks for any help that you can provide.

Regards,

David Jessop

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