The CO2 absorption continuum by high pressure CRDS in the 1.74 µm window : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1016/j.jqsrt.2017.02.019

Ключевые слова: Carbon dioxide, CO2, Continuum, Transparency windows, Venus

Аннотация: The very weak absorption continuum of CO2 is studied by Cavity Ring Down Spectroscopy in three 20 cm−1 wide spectral intervals near the centre of the 1.74 µm window (5693–5795 cm−1). For each spectral interval, a set of room temperature spectra is recorded at pressures between 0 and 10 bar thanks to a high pressure CRDS spectrometeПоказать полностьюr. The absorption continuum is retrieved after subtraction of the contributions due to Rayleigh scattering and to local lines of CO2 and water (present as an impurity in the sample) from the measured extinction. Due to some deficiencies of the CO2 HITRAN2012 line list, a composite line list had to be built on the basis of the Ames calculated line list with line positions adjusted according to the Carbon Dioxide Spectroscopic Databank and self-broadening and pressure shift coefficients calculated with the Complex Robert Bonamy method. The local line contribution of the CO2 monomer is calculated using this list and a Voigt profile truncated at ±25 cm−1 from the line centre. Line mixing effects were taken into account through the use of the impact and Energy Corrected Sudden approximations. The density dependence of the retrieved continuum absorption was found to be purely quadratic in the low frequency interval below 5710 cm−1 but a small significant linear contribution was required to reproduce the observations above this value. This linear increase is tentatively attributed to the foreign-continuum of water vapor present in CO2 sample with a relative concentration of some tens ppm. The retrieved binary coefficient is observed to vary smoothly with the wavenumber with a minimum value of 6×10−10 cm−1 amagat−2. By gathering the present data with the results reported in Kassi et al. J Quant Spectrosc Radiat Transf 2015;167:97, a recommended set of binary coefficients is provided for the 5700–5950 cm−1 region. © 2017 Elsevier Ltd

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Издание

Журнал: Journal of Quantitative Spectroscopy and Radiative Transfer

Выпуск журнала: Vol. 203

Номера страниц: 530-537

ISSN журнала: 00224073

Издатель: Elsevier Ltd

Персоны

  • Mondelain D. (Univ. Grenoble Alpes, LIPhy, Grenoble, France, CNRS, LIPhy, Grenoble, France)
  • Campargue A. (Univ. Grenoble Alpes, LIPhy, Grenoble, France, CNRS, LIPhy, Grenoble, France)
  • Čermák P. (Univ. Grenoble Alpes, LIPhy, Grenoble, France, CNRS, LIPhy, Grenoble, France, Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina F2, Bratislava, Slovakia)
  • Gamache R.R. (Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts, Lowell, MA, United States)
  • Kassi S. (Univ. Grenoble Alpes, LIPhy, Grenoble, France, CNRS, LIPhy, Grenoble, France)
  • Tashkun S.A. (Laboratory of Theoretical Spectroscopy, V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, 1, Academician Zuev Square, Tomsk, Russian Federation, Laboratory of Climate and Environmental Physics, Ural Federal University, Mira street, 19, Yekaterinburg, Russian Federation)
  • Tran H. (Laboratoire de Météorologie Dynamique, IPSL, CNRS UMR 8539, Sorbonne Universités, UPMC Univ. Paris 06, Paris, France)

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