On the origin of the water vapor continuum absorption within rotational and fundamental vibrational bands

Serov, E. A.; Odintsova, T.A.; Tretyakov, M.Yu.; Semenov, V. E.

doi:10.1016/j.jqsrt.2017.02.011

Cited by 40 publications

(19 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[4]). Note that a complete and accurate line list of the water monomer, including line profile parameters, is also a prerequisite for a reliable determination of the atmospheric continuum absorption, which is one of the oldest and the long-standing problem in molecular spectroscopy (e.g., review papers [5][6][7] and references therein).…”

Section: Introductionmentioning

confidence: 99%

The far-infrared spectrum of 18O enriched water vapour (40–700 cm−1)

Михайленко

Béguier

Odintsova

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

View full text Add to dashboard Cite

The rotational spectrum of water vapour highly enriched in 18 O has been studied by high resolution (≈ 0.001 cm -1 ) Fourier transform spectroscopy at the AILES beam line of the SOLEIL synchrotron. The room temperature absorption spectrum has been recorded between 40 and 700 cm -1 . The 18 O enrichment of the sample was about 97% while the gas pressure and the absorption pathlength were set to 0.97 mbar and 151.75 m, respectively. The spectrum contains more than 4800 rotational transitions from seven water isotopologues (H2 18 O, H2 16 O, H2 17 O, HD 18 O, HD 16 O, HD 17 O, D2 18 O). The assignments were performed using known experimental energy levels as well as calculated line lists based on the results of Schwenke and Partridge. The amount and accuracy of the reported line positions represent an important extension compared to previous works. Overall, lines of about 2570 transitions are observed for the first time and 35, 41, 50, and 16 new energy levels are determined for H2 18 O, H2 17 O, HD 18 O, and HD 17 O, respectively. The set of derived energy levels shows a number of important differences from those recommended by an IUPAC-task group. Compared to the HITRAN2016 database, numerous deviations of line positions (up to 0.15 cm -1 ) are found for the H2 17 O, H2 18 O, HD 17 O, and HD 18 O species. Incomplete and wrong HITRAN's assignments of more than 90 transitions for H2 18 O, H2 17 O and HD 18 O are identified. Overall, the measured line positions will allow to significantly refine and complete the sets of empirical energy levels of H2 18 O, H2 17 O, HD 18 O and HD 17 O in the ground vibrational state.

show abstract

Section: Introductionmentioning

confidence: 99%

The far-infrared spectrum of 18O enriched water vapour (40–700 cm−1)

Михайленко

Béguier

Odintsova

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…More than one century after its discovery (cf [513,514] and the review in [357]), the strength and physical origin of the absorption continua of water vapor remain an open question. In particular, the question of the respective contributions of the monomer line wings, of the stable and metastable dimers and of collision-induced absorption is not yet settled, as discussed in appendix V.A of [1] and in [391,427,[515][516][517][518][519][520][521]. On this issue, note that water dimers have been recently found to contribute to the continuum in the 14-35 cm -1 wave number region [522].…”

Section: The Water-vapor Continuamentioning

confidence: 99%

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Hartmann

Tran

Armante

et al. 2018

Journal of Quantitative Spectroscopy and Radiative Transfer

100

View full text Add to dashboard Cite

“…Concerning the water vapor contribution to nonresonance absorption, despite a general understanding of the physical nature (e.g., Shine et al, 2012;Tretyakov et al, 2014;Serov et al, 2017), there are no sufficiently accurate theoretical models for calculating the spectra of all necessary components (especially in gas mixtures) and their temperature dependences. Therefore, for practical purposes parameters of the observed nonresonant absorption are determined using simple empirical models, which have not been supported by accurate theoretical calculations and are based on experimental data only .…”

Section: Nonresonant Absorptionmentioning

confidence: 99%

Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

et al. 2018

View full text Add to dashboard Cite

Abstract. This paper presents a general approach to quantify absorption model uncertainty due to uncertainty in the underlying spectroscopic parameters. The approach is applied to a widely used microwave absorption model (Rosenkranz, 2017) and radiative transfer calculations in the 20–60 GHz range, which are commonly exploited for atmospheric sounding by microwave radiometer (MWR). The approach, however, is not limited to any frequency range, observing geometry, or particular instrument. In the considered frequency range, relevant uncertainties come from water vapor and oxygen spectroscopic parameters. The uncertainty of the following parameters is found to dominate: (for water vapor) self- and foreign-continuum absorption coefficients, line broadening by dry air, line intensity, the temperature-dependence exponent for foreign-continuum absorption, and the line shift-to-broadening ratio; (for oxygen) line intensity, line broadening by dry air, line mixing, the temperature-dependence exponent for broadening, zero-frequency line broadening in air, and the temperature-dependence coefficient for line mixing. The full uncertainty covariance matrix is then computed for the set of spectroscopic parameters with significant impact. The impact of the spectroscopic parameter uncertainty covariance matrix on simulated downwelling microwave brightness temperatures (TB) in the 20–60 GHz range is calculated for six atmospheric climatology conditions. The uncertainty contribution to simulated TB ranges from 0.30 K (subarctic winter) to 0.92 K (tropical) at 22.2 GHz and from 2.73 K (tropical) to 3.31 K (subarctic winter) at 52.28 GHz. The uncertainty contribution is nearly zero at 55–60 GHz frequencies. Finally, the impact of spectroscopic parameter uncertainty on ground-based MWR retrievals of temperature and humidity profiles is discussed.

show abstract

On the origin of the water vapor continuum absorption within rotational and fundamental vibrational bands

Cited by 40 publications

References 51 publications

The far-infrared spectrum of 18O enriched water vapour (40–700 cm−1)

The far-infrared spectrum of 18O enriched water vapour (40–700 cm−1)

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

Contact Info

Product

Resources

About