Measurements and calculations of H2O broadened by CO2 collisional parameters for planetary atmospheres
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Authors
Ducreux, E.
Vispoel, B.
Grouiez, B.
Gamache, R.R.
Lepère, M.
Robert, S.
Régalia, L.
Discipline
Physical sciences
Subject
High resolution infrared spectroscopy
Complex Robert-Bonamy-Ma calculations
Line shape parameters
Water vapor
Carbon dioxide
Planetary atmospheres
Audience
Scientific
Date
2025Metadata
Show full item recordDescription
Collisional parameters of H2O with CO2 are currently missing from international spectroscopic databases, although they are essential for accurate modeling of water vapor in CO2-rich planetary atmospheres. In this study, high-resolution infrared spectra of H2O broadened by CO2 were recorded using a Fourier Transform Spectrometer in the 1.18 and 2.34 µm spectral regions. CO2-collisional parameters for selected H2O transitions were derived through a multispectrum fitting procedure employing both Voigt and quadratic speed-dependent Voigt profiles. Furthermore, calculations based on the semi-classical Complex Robert-Bonamy-Ma formalism were performed to estimate CO2-broadened half-widths, line shifts, and their temperature dependencies across various atmospheric transparency windows. It results in a strong agreement between theoretical predictions and experimental data. Finally, the shared calculated linelist, obtained for a wide range of transitions, can be directly applied to radiative transfer modeling of atmospheres primarily composed of carbon dioxide.
Citation
Ducreux, E.; Vispoel, B.; Grouiez, B.; Gamache, R.R.; Lepère, M.; Robert, S.; Régalia, L. (2025). Measurements and calculations of H2O broadened by CO2 collisional parameters for planetary atmospheres. , Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 345, A109576, DOI: 10.1016/j.jqsrt.2025.109576.Identifiers
url:
Type
Article
Peer-Review
Yes
Language
eng