A fictive gas-method for accurate computations of low-resolution IR gas transmissivities : application to the 4.3 μm CO2 band

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Abstract
The transmissivities of inhomogeneous or nonisothermal gas columns are computed for a 25 cm-1 resolution ; the method is suitable for teledetection or coupled radiative and convective transfer applications. The basic idea is to consider fictive gases, characterized by a set of lines of the real absorbing gas, which have a common behaviour with respect to temperature. We use a line-by-line approach to obtain the parameters of our model, which are tabulated as functions of the temperature and of a non dimensional line-width parameter. This model leads to a better agreement with a line-by-line calculation than narrow-band-statistical models and requires smaller computer times than the line-by-line approach

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