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Under cloud free conditions, the Michelson Interferometerfor Passive Atmospheric Sounding (MIPAS) provides measurementsof spectrally resolved limb radiances down to the upper troposphere.These are used to infer global distributions of mixing ratios ofatmospheric constituents in the upper troposphere and the stratosphere.From 21 October to 12 November 2003, MIPAS observed enhancedamounts of upper tropospheric C2H6 (up to about 400 pptv)and ozone (up to about 80 ppbv). The absolute values of C2H6,however, may be systematically low by about 30% due to uncertaintiesof the spectroscopic data used. By means of trajectorycalculations, the enhancements observed in the southern hemisphereare, at least partly, attributed to a biomass burning plume, whichcovers wide parts of the Southern hemisphere, from South America,the Atlantic Ocean, Africa, the Indian Ocean to Australia.The chemical composition of the part of the plume-like pollutionbelt associated with South American fires, where rainforest burningis predominant appears different from the part of the plume associatedwith southern African savanna burning. In particular, African savannafires lead to a larger ozone enhancement than equatorial Americanfires. In this analysis, MIPAS observations of high ozone weredisregarded where low CFC-11 (below 245 pptv) was observed, becausethis hints at a stratospheric component in the measured signal.Different type of vegetation burning (flaming versus smoulderingcombustion) has been identified as a candidate explanation for the different plume compositions

atmospheric chemistry and physics

MIPAS measurements of upper tropospheric C&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;H&amp;lt;sub&amp;gt;6&amp;lt;/sub&amp;gt; and O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; during the southern hemispheric biomass burning season in 2003