Diurnal variation of stratospheric chlorine monoxide - A critical test of chlorine chemistry in the ozone layer

摘要: This article reports measurements of the column density stratospheric chlorine monoxide and presents a complete diurnal record its variation (with 2-hour resolution) obtained from ground-based observations millimeter-wave spectral line at 278 gigahertz. Observations were carried out during October December 1982 Mauna Kea, Hawaii. The results reported here indicate that mixing ratio above 30 kilometers daytime are ∼ 20 percent lower than model predictions based on 2.1 parts per billion total chlorine. observed day-to-night is, however, in good agreement with recent predictions, confirms existence nighttime reservoir for chlorine, verifies predicted general rate storage retrieval. From this evidence, it appears chemistry is close to being understood current models. Models measured reaction rates predict reduction ozone content range 3 5 final steady state an otherwise unperturbed atmosphere, although percentage decrease upper stratosphere much higher.