Obtaining the cumulative k-distribution of a gas mixture from those of its components

Abstract

The convolution theorem fot obtaining the cumulative k-distribution of a gas mixture requires assumptions than the multiplicative property of band transmission; thus new experimental investigations of its effectiveness are undertaken. The convolution is found to be a useful speed optimization of k-distribution at high pressures. For low pressures a variety of mixing methods are compared, all relying in the fact that stratospheric lines are too narrow to overlap. The optimal altitude for changing over from the convolution to one othe methods is strongly correlated with the logarithm of the ratio of linwidth to line spacing. Some spectrally-integrated outputs of the resulting split-level method are compared with another method requiring much less computation.