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Absorption of Solar Radiation by Atmospheric Carbon Dioxide

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Abstract

The absorption spectra of the 4.3-μ band was measured at altitudes from 10 to 30 km along slant paths in the atmosphere using the sun as a radiation source. These spectra were obtained by the use of a balloon-borne grating spectrometer having a resolution of 0.5 cm−1. This resolution is high enough to require a line-by-line calculation to interpret the spectra. By making two assumptions it has been possible to calculate spectra (using a small computer) that agree quite well with the observed spectra. The primary approximations used were the assumption of like rotational structure for all isotopes and excited states, and the assumption of constant displacement between the various states of 12C and 13C. At the higher altitudes the Lorentz broadening theory resulted in a satisfactory agreement between the calculations and the experimental results, but at the lower altitudes use of the empirical modification proposed by Benedict was necessary to obtain agreement in the region of the high-frequency end of the band. The calculations cover the frequencies from 2235 to 2415 cm−1.

© 1965 Optical Society of America

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