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

Abstract : The ACE-FTS (Atmospheric Chemistry Experiment – Fourier Transform Spectrometer) solar occultation instrument that was launched onboard the Canadian SCISAT-1 satellite in August 2003 is measuring vertical profiles from the upper troposphere to the lower mesosphere for a large number of atmospheric constituents. Methane is one of the key species. The version v2.2 data of the ACE-FTS CH4 data have been compared to correlative satellite, balloon-borne and ground-based Fourier transform infrared remote sensing data to assess their quality. The comparison results indicate that the accuracy of the data is within 10% in the upper troposphere – lower stratosphere, and within 25% in the middle and higher stratosphere up to the lower mesosphere (<60 km). The observed differences are generally consistent with reported systematic uncertainties. ACE-FTS is also shown to reproduce the variability of methane in the stratosphere and lower mesosphere.
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M. de Mazière, C. Vigouroux, P. F. Bernath, P. Baron, T. Blumenstock, et al.. Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to lower mesosphere. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2007, 7 (6), pp.17975-18014. ⟨hal-00328249⟩

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