Modelling of the spectral absorption coefficient in a pure CO2 atmosphere in the region of 17 mu m

NN Filippov, MV Tonkov, VP Ogibalov

Research outputpeer-review

Abstract

The absorption coefficients of the pure CO2 gas in the region of 17 mum were examined. A special attention was paid to the line mixing effect that influenced the spectral shape in the Q-branch regions of the absorption bands. Two methods in shape description were analyzed. The first method uses the Rosenkranz line shapes with the line mixing parameters, which are found from an empirical rotational relaxation matrix; this matrix is constructed using the shape analyses of the band of a different spectral region (Edwards and Strow, 1991). The second method is based on the strong collision model with adjusted branch coupling (Tonkov et al., 1996), and it is necessary to use only one empirical parameter for all the bands to describe the line mixing effect on line shapes. This method was generalized to the bands of a PiDelta type. The merits and the demerits of these two methods are discussed, and the results of the correspondent calculations are compared to experimental shapes. It is inferred that the strong collision model for the absorption coefficient calculations can be applied in solving the non-LTE radiative transfer problem in CO2 bands in the atmosphere of Mars.

Original languageEnglish
Title of host publicationIRS 2000: CURRENT PROBLEMS IN ATMOSPHERIC RADIATION
EditorsWL Smith, YM Timofeyev
PublisherA. Deepak Publishing
Pages627-630
Number of pages4
ISBN (Print)0-937194-43-3
Publication statusPublished - 2001
EventInternational Radiation Symposium - ST PETERSBURG
Duration: 24 Jul 200029 Jul 2000

Publication series

NameSTUDIES IN GEOPHYSICAL OPTICS AND REMOTE SENSING
PublisherA DEEPAK PUBLISHING

Conference

ConferenceInternational Radiation Symposium
CityST PETERSBURG
Period24/07/0029/07/00

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