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Atmospheric and Oceanic Optics

2019 year, number 3

Contribution of the errors in line parameters to retrieval of the water vapor continuum absorption within 0.94 and 1.13 Ојm bands

A.A. Simonova, I.V. Ptashnik
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: континуальное поглощение, водяной пар, параметры спектральных линий, полосы поглощения, ближний ИК-диапазон частот, continuum absorption, water vapor, spectral line parameters, absorption bands, near-IR spectral range


The retrieved continuum absorption spectra in pure water vapor within near-IR bands 0.94 and 1.13 mm (10600 and 8800 cm-1) are investigated. The continuum was determined as a difference between the water vapor absorption spectra measured using a Fourier transform spectrometer and absorption spectra of the water monomers calculated using the HITRAN2016 database. The work is aimed at estimation of the maximum error in retrieval of the continuum absorption coefficient, which is caused by uncertainty in spectral line parameters in HITRAN2016. It is shown that the calculated errors exceed other types of errors within the absorption bands under studied.