Modeling of inelastically scattered radiation: Rotational Raman scattering in the spherical Earth's atmosphere. (July 2021)

• Record Type: Journal Article
• Authors: Rozanov, Alexei V.; Rozanov, Vladimir V.; Burrows, John P.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 268(2021)
• Publication Date: 2021-07
• Subjects: Rotational Raman scattering -- Spherical atmosphere -- Radiative transfer -- SCIATRAN radiative transfer model; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2021.107611
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Rotational Raman scattering in a spherical atmosphere is accounted for. The solution method is based on the forward-adjoint perturbation theory. Filling-in of solar Fraunhofer lines is strongly dependent on the spectral resolution. Sensitivity to atmospheric and surface parameters is illustrated. Relevance for the limb-scatter retrievals is discussed. Abstract: This study presents an approximative approach to solve the radiative transfer equation accounting for the rotational Raman scattering in a spherical atmosphere. The solution is obtained employing the method of characteristics in combination with the discrete-ordinates technique and the forward-adjoint perturbation theory. For a non-limb observational geometry, impact of the atmospheric sphericity on the filling-in of solar Fraunhofer lines is discussed. For a limb viewing geometry, the dependence of the filling-in on the surface elevation, surface albedo, and cloudiness below the instrument line of sight as well as the effect of the multiple scattering in the spatial domain is analyzed. A comparison of modeled and measured Ring spectra for a limb-viewing geometry is shown. The considered solution technique is implemented in the radiative transfer model SCIATRAN and is ready to use for atmospheric applications.