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Profiles of CFC-11 (CCl3F) and CFC-12 (CCl2F2) of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) aboard the European satellite Envisat have been retrieved from versions MIPAS/4.61 toMIPAS/4.62 and MIPAS/5.02 to MIPAS/5.06 level-1b data using the scientificlevel-2 processor run by Karlsruhe Institute of Technology (KIT), Instituteof Meteorology and Climate Research (IMK) and Consejo Superior deInvestigaciones Científicas (CSIC), Instituto de Astrofísica deAndalucía (IAA). These profiles have been compared to measurements takenby the balloon-borne cryosampler, Mark IV (MkIV) and MIPAS-Balloon (MIPAS-B),the airborne MIPAS-STRatospheric aircraft (MIPAS-STR), the satellite-borneAtmospheric Chemistry Experiment Fourier transform spectrometer(ACE-FTS) and the High Resolution Dynamic Limb Sounder (HIRDLS), aswell as the ground-based Halocarbon and other Atmospheric Trace Species(HATS) network for the reduced spectral resolution period(RR: January 2005–April 2012) of MIPAS. ACE-FTS, MkIV and HATS also provide measurements during the high spectral resolution period (full resolution, FR: July 2002–March 2004) and were used to validate MIPAS CFC-11 and CFC-12 products during that time, as well as profiles from the Improved Limb Atmospheric Spectrometer, ILAS-II. In general, we find that MIPAS shows slightly higher valuesfor CFC-11 at the lower end of the profiles (below  ∼  15 km) and in acomparison of HATS ground-based data and MIPAS measurements at 3 km belowthe tropopause. Differences range from approximately 10 to 50 pptv( ∼  5–20 %) during the RR period. In general, differences are slightlysmaller for the FR period. An indication of a slight high bias at the lowerend of the profile exists for CFC-12 as well, but this bias is far lesspronounced than for CFC-11 and is not as obvious in the relative differencesbetween MIPAS and any of the comparison instruments. Differences at the lowerend of the profile (below  ∼  15 km) and in the comparison of HATS andMIPAS measurements taken at 3 km below the tropopause mainly stay within10–50 pptv (corresponding to  ∼  2–10 % for CFC-12) for the RR and theFR period. Between  ∼  15 and 30 km, most comparisons agree within10–20 pptv (10–20 %), apart from ILAS-II, which shows largedifferences above  ∼  17 km. Overall, relative differences are usuallysmaller for CFC-12 than for CFC-11. For both species – CFC-11 and CFC-12 – wefind that differences at the lower end of the profile tend to be larger athigher latitudes than in tropical and subtropical regions. In addition, MIPASprofiles have a maximum in their mixing ratio around the tropopause, which ismost obvious in tropical mean profiles. Comparisons of the standarddeviation in a quiescent atmosphere (polar summer) show that only the CFC-12FR error budget can fully explain the observed variability, while for theother products (CFC-11 FR and RR and CFC-12 RR) only two-thirds to three-quarters can be explained. Investigations regarding the temporal stabilityshow very small negative drifts in MIPAS CFC-11 measurements. These instrument drifts vary between  ∼  1 and 3 % decade−1. For CFC-12, the driftsare also negative and close to zero up to  ∼  30 km. Above that altitude, larger drifts of up to  ∼  50 % decade−1 appear which are negative up to ∼  35 km and positive, but of a similar magnitude, above

MIPAS IMK/IAA CFC-11 (CCl3F) and CFC-12 (CCl2F2) measurements: accuracy, precision and long-term stability

MIPAS IMK/IAA CFC-11 (CCl₃F) and CFC-12 (CCl₂F₂) measurements: accuracy, precision and long-term stability