Abstract
This paper describes a method for obtaining the abundance and altitude of stratospheric NO2 by using ground‐based spectroscopy at twilight. The method is then used to study the behavior of NO2 over Colorado at 40°N; a companion paper discussed observations elsewhere. Large changes in both the abundance of NO2 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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