Obtaining the cumulative kdistribution of a gas mixture from those of its components.
Abstract
The convolution theorem for obtaining the cumulative kdistribution of a gas mixture requires stronger 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 kdistribution calculations at high pressures. For low pressures a variety of mixing methods are compared, all relying on the fact that stratospheric lines are too narrow to overlap. The optimal altitude for changing over from the convolution to one of these other methods is strongly correlated with the logarithm of the ratio of linewidth to line spacing. Some spectrallyintegrated outputs of the resulting splitlevel method are compared with another method requiring much less computation.
 Publication:

Journal of Quantitative Spectroscopy and Radiative Transfer
 Pub Date:
 January 1993
 DOI:
 10.1016/00224073(93)90015A
 Bibcode:
 1993JQSRT..49...15G
 Keywords:

 Gas Mixtures;
 Radiative Transfer;
 Spectral Correlation;
 Stratosphere Radiation;
 Absorptivity;
 Atmospheric Attenuation;
 Convolution Integrals;
 Geophysics