Anderson, J. G., H. J. Grassl, R. E. Shetter, and J. J. Margitan, Stratospheric free chlorine measured by balloon-borne in situ resonance fluorescence, J. Geophys. Res. 85, 2869–87, 1980. [doi:10.1029/JC085iC05p02869]

Eight balloon-borne in situ measurements of ClO in the stratosphere are presented. Six of the observations, which were carried out close to local noon, are compared with recent model calculations at the appropriate latitude (32°N), altitude (25–45 km), and solar zenith angle interval (10° < χ < 55°). The ClO mixing ratio by volume observed on four flights between the autumnal equinox and...