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Atmospheric and Oceanic Optics

2013 year, number 4

Accounting for the humidity of expired air when retrieving gaseous biomarkers

O.Yu. Nikiforova, Yu.N. Ponomarev, A.I. Karapuzikov
Keywords: expired air, gas analysis, gaseous biomarker, water vapor


In this work we use numerical simulation to estimate possible errors of the differential-absorption retrieval of concentrations of such gaseous biomarkers as СН4, СО, NH3, N2O, С2Н6, and H2S from the three-component gas mixture absorption spectra in the 2–4 mm spectral region. The gas mixture is supposed to simulate an expired air. The absorption spectra were calculated with a resolution of 2 cm–1 using the HITRAN database. The impact of subtraction of the water vapor absorption from the simulated spectra on the error in retrieved concentrations of the gases-biomarkers was studied. The water vapor concentration in the mixture was determined from absorption at 3800 cm–1.