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. Hydrochlorofluorocarbons (HCFCs) are the first, buttemporary, substitution products for the strong ozone-depletingchlorofluorocarbons (CFCs). HCFC consumption and production are currentlyregulated under the Montreal Protocol on Substances that Deplete the OzoneLayer and their emissions have started to stabilize or even decrease. AsHCFC-22 ( CHClF2 ) is by far the most abundant HCFC in today'satmosphere, it is crucial to continue to monitor the evolution of itsatmospheric concentration. In this study, we describe an improved HCFC-22retrieval strategy from ground-based high-resolution Fourier transforminfrared (FTIR) solar spectra recorded at the high-altitude scientificstation of Jungfraujoch, the Swiss Alps, 3580 m a.m.s.l. (above mean sea level). This newstrategy distinguishes tropospheric and lower-stratospheric partial columns.Comparisons with independent datasets, such as the Advanced Global Atmospheric GasesExperiment (AGAGE) and the Michelson Interferometer for Passive AtmosphericSounding (MIPAS), supported by models, such as the Belgian Assimilation System forChemical ObErvation (BASCOE) and the Whole Atmosphere Community ClimateModel (WACCM), demonstrate the validity of our tropospheric and lower-stratospheric long-term time series. A trend analysis on the datasets usedhere, now spanning 30 years, confirms the last decade's decline inthe HCFC-22 growth rate. This updated retrieval strategy can be adapted forother ozone-depleting substances (ODSs), such as CFC-12. Measuring orretrieving ODS atmospheric concentrations is essential for scrutinizing thefulfilment of the globally ratified Montreal Protocol.

atmospheric chemistry and physics

Improved FTIR retrieval strategy for HCFC-22 (CHClF&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;), comparisons with in situ and satellite datasets with the support of models, and determination of its long-term trend above Jungfraujoch