Trends in stratospheric HCl from the ACE satellite mission

The Montreal Protocol has banned the production of long-lived chlorine-containing gases such as chlorofluorocarbons (CFCs) that deplete stratospheric ozone. These halogenated compounds ultimately form HCI in the upper atmosphere; the effectiveness of the Montreal Protocol can therefore be monitored by measuring stratospheric HCI. The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) measures infrared solar occultation spectra of the Earth's atmosphere from which altitude profiles of HCI volume mixing ratios (VMRs) are determined. The upper stratospheric HCI VMR time series has a linear trend of -4.8 +/- 0.2%/decade for 2004-2017, highlighting the continuing success of the Montreal Protocol. (C) 2018 Elsevier Ltd. All rights reserved.