Atmos. Chem. Phys. Discuss., 6, 3945-3963, 2006
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
First space-borne measurements of methanol inside aged tropical biomass burning plumes using the ACE-FTS instrument
G. Dufour1, C. D. Boone2, C. P. Rinsland3, and P. F. Bernath2
1Laboratoire de Météorologie Dynamique/Institut Pierre Simon Laplace, Palaiseau, France
2Department of Chemistry, University of Waterloo, Ontario, Canada
3NASA Langley Research Center, Hampton, VA, USA

Abstract. First measurements from space of upper tropospheric and lower stratospheric methanol profiles within aged fire plumes are reported. Elevated levels of methanol at 0–45° S from 30 September to 3 November 2004 have been measured by the high resolution infrared spectrometer ACE-FTS onboard the SCISAT satellite. Methanol volume mixing ratios higher than 4000 pptv are detected and are strongly correlated with other fire products such as CO, C2H6, and HCN. A sensitivity study of the methanol retrieval, accounting for random and systematic contributions, shows that the retrieved methanol profile is reliable from 8.5 to 16.5 km, with an accuracy of about 20% for measurements inside polluted air masses. The upper tropospheric enhancement ratio of methanol with respect to CO is estimated from the correlation plot between methanol and CO for aged tropical biomass burning plumes. This ratio is in good agreement with the ratio measured in the free troposphere (up to 12 km) by recent aircraft studies and does not suggest any secondary production of methanol by oxidation in aged biomass burning plumes.

Citation: Dufour, G., Boone, C. D., Rinsland, C. P., and Bernath, P. F.: First space-borne measurements of methanol inside aged tropical biomass burning plumes using the ACE-FTS instrument, Atmos. Chem. Phys. Discuss., 6, 3945-3963, doi:10.5194/acpd-6-3945-2006, 2006.
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