Hi ARTS devs,

I've got another question about the Tretyakov-05 complete absorption 
implementation in ARTS. In the code for TRE05O2AbsModel, the line absorption is 
calculated, and then converted in the final line into a partial cross-section. 
When calculating this cross-section a constant equal to the O2 vmr assumed by 
Tretyakov 2005 (0.20946) multiplied by the main isotope abundance is used, 
rather than just the O2 vmr. Should the isotope abundance really be included 
here? Presumably it depends on whether it is also included at the stage of the 
absorption calculation, or if the total O2 vmr is used there, but I'm not 
familiar enough with the ARTS code to know which is the case? I guess I would 
expect it should work properly for the case where the user defines 
"abs_species_O2" without explicitly setting an isotopologue ratio; the tests 
I've done suggest this is not currently the case.



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