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First measurements from space of upper tropospheric and lower stratosphericmethanol profiles within aged fire plumes are reported. Elevated levels ofmethanol at 0–45° S from 30 September to 3 November 2004 have beenmeasured by the high resolution infrared spectrometer ACE-FTS onboard theSCISAT satellite. Methanol volume mixing ratios higher than 4000 pptv aredetected and are strongly correlated with other fire products such as CO,C<sub>2</sub>H<sub>6</sub>, and HCN. A sensitivity study of the methanol retrieval,accounting for random and systematic contributions, shows that the retrievedmethanol profile for a single occultation exceeds 100% error above 16.5 km, with an accuracy of about20% for measurements inside polluted air masses. The upper troposphericenhancement ratio of methanol with respect to CO is estimated from thecorrelation plot between methanol and CO for aged tropical biomass burningplumes. This ratio is in good agreement with the ratio measured in the freetroposphere (up to 12 km) by recent aircraft studies and does not suggestany secondary production of methanol by oxidation in aged biomass burningplumes

First space-borne measurements of methanol inside aged southern tropical to mid-latitude biomass burning plumes using the ACE-FTS instrument