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The ACE-FTS (Atmospheric Chemistry Experiment – Fourier TransformSpectrometer) solar occultation instrument that was launched onboard theCanadian SCISAT-1 satellite in August 2003 is measuring vertical profilesfrom the upper troposphere to the lower mesosphere for a large number ofatmospheric constituents. Methane is one of the key species. The versionv2.2 data of the ACE-FTS CH<sub>4</sub> data have been compared to correlativesatellite, balloon-borne and ground-based Fourier transform infrared remotesensing data to assess their quality. The comparison results indicate thatthe accuracy of the data is within 10% in the upper troposphere – lowerstratosphere, and within 25% in the middle and higher stratosphere up tothe lower mesosphere (<60 km). The observed differences are generallyconsistent with reported systematic uncertainties. ACE-FTS is also shown toreproduce the variability of methane in the stratosphere and lowermesosphere

Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere