Key points are not available for this paper at this time.
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.
Noxon et al. (Mon,) studied this question.