Articles | Volume 22, issue 7
Atmos. Chem. Phys., 22, 4779–4799, 2022
https://doi.org/10.5194/acp-22-4779-2022
Atmos. Chem. Phys., 22, 4779–4799, 2022
https://doi.org/10.5194/acp-22-4779-2022
Research article
12 Apr 2022
Research article | 12 Apr 2022

Upper stratospheric ClO and HOCl trends (2005–2020): Aura Microwave Limb Sounder and model results

Lucien Froidevaux et al.

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Latest update: 08 Aug 2022
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Short summary
We analyze satellite-derived distributions of chlorine monoxide (ClO) and hypochlorous acid (HOCl) in the upper atmosphere. For 2005–2020, from 50°S to 50°N and over ~30 to 45 km, ClO and HOCl decreased by −0.7 % and −0.4 % per year, respectively. A detailed model of chemistry and dynamics agrees with the results. These decreases confirm the effectiveness of the 1987 Montreal Protocol, which limited emissions of chlorine- and bromine-containing source gases, in order to protect the ozone layer.
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