This paper describes a method for obtaining the abundance and altitude of stratospheric NO 2 by using ground‐based spectroscopy at twilight. The method is then used to study the behavior of NO 2 over Colorado at 40°N; a companion paper discussed observations elsewhere. Large changes in both the abundance of NO 2 and in its diurnal variation are commonly seen at mid‐latitude and appear to reflect the role of quasi‐horizontal transport in the stratosphere on a global scale.
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Noxon et al. (1979) studied this question.
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