Abstract

A theoretical study was performed to explore the possibility of shortening the 2–3-h time requirement for a Dobson Umkehr observation by incorporating more wavelength pairs into the measurement procedure. In essence, the measurement becomes one of using wavelength in place of solar zenith angle as the independent variable. Practical and physical limitations restrict the variable-wavelength method to solar zenith angles 75° < θ0 < 90°. Solution residual variance and correlation criteria are used to judge the statistical information content of each method in order to establish a degree of equivalence between the two. As a check on the validity of the theoretical approach, a limited eigenvalue analysis is performed on the synthesized Umkehr observations, and this is compared with eigenanalyses on real Umkehr data reported by other investigators. The over-all results of the present investigation indicate that the variable-wavelength method possesses the potential for deducing vertical ozone profiles at least equivalent to, if not slightly better than, profiles deduced by the standard Umkehr method.

© 1979 Optical Society of America

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