Abstract: Using the RFM model, the limb radiance errors of the four main atmospheric components (CO₂ , O₃ ,
H₂O and N₂O) in the radiative transfer observed by atmospheric infrared ultra-high spectral detector due to the
uncertainty of the position, intensity and width of the absorption lines were simulated. Based on the statistics
of molecular absorption line uncertainty code in HITRAN2016 database, the value whose uncertainty code is not
less than 3 was used in radiation transmission calculation. It is found that the uncertainty of the absorption lines
of different molecules has different effects on the limb radiances at different tangent heights, and the uncertainty
factors play different role separately or mutually. Meanwhile, the radiance absolute and relative errors caused by the
three uncertain factors of the atmospheric molecules were also simulated and calculated in four infrared bands of
the detector, which provides data basis for spectral channel selection and atmospheric parameter inversion.

Key words: radiative transfer, HITRAN2016, atmospheric infrared ultra-high spectral detector, limb radiance;
uncertainty