SIMPLE MODELING OF THE TEMPERATURE-DEPENDENCE OF THE FIRST-ORDER LINE-MIXING COEFFICIENTS Y-L(T)

A simple approach is proposed in order to model the temperature depend ence of the first-order line-mixing coefficients Y-l(T). It respects a sum rule whose breakdown leads to large errors in atmospheric spectra computations. Furthermore, only two parameters, which can be represen ted with no more than three significant figures, are required (for air -broadening) for each line. Contrary to previous ones, our model is th us particularly suitable for storage of line-mixing parameters in data bases. Tests in the case of two CO2 Q branches near 14 mu m and of O-2 absorption in the centimeter wave region under various pressure and t emperature conditions show the accuracy of our approach. Copyright (C) 1997 Elsevier Science Ltd.