Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 3 2007 10.5194/acpd-7-7907-2007 http://www.atmos-chem-phys-discuss.net/7/7907/2007/ http://www.atmos-chem-phys-discuss.net/7/7907/2007/acpd-7-7907-2007.html http://www.atmos-chem-phys-discuss.net/7/7907/2007/acpd-7-7907-2007.pdf 7907 7932 2007-06-04 ACE-FTS observation of a young biomass burning plume: first reported measurements of C₂H₄, C₃H₆O, H₂CO and PAN by infrared occultation from space P.-F. Coheur pfcoheur@ulb.ac.be H. Herbin C. Clerbaux D. Hurtmans C. Wespes M. Carleer S. Turquety C. P. Rinsland J. Remedios D. Hauglustaine C. D. Boone P. F. Bernath Spectroscopie de l'atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium Service d'Aéronomie/Institut Pierre-Simon Laplace, CNRS, Université Pierre et Marie Curie-Paris6, France NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681-2199, USA Earth Observation Science, Space Research Centre, Department of Physics & Astronomy University of Leicester, University Road, Leicester, LE1 7RH, UK Laboratoire des Sciences du Climat et de l'Environnement (LSCE)/Institut Pierre-Simon Laplace, CEA-CNRS, F-91191 Gif-sur-Yvette CEDEX, France Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada Department of Chemistry, University of York, Heslington, York YO10 5DD, UK In the course of our study of the upper tropospheric composition with the infrared Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE–FTS), we found an occultation sequence that on 8 October 2005, sampled a remarkable plume near the east coast of Tanzania. Model simulations of the CO distribution in the Southern hemisphere are performed for this period and they demonstrate that the emissions for this event originated from a nearby forest fire, after which the plume was transported from the source region to the upper troposphere. Taking advantage of the very high signal-to-noise ratio of the ACE–FTS spectra over a wide wavenumber range (750–4400 cm^−1), we present in-depth analyses of the chemical composition of this plume in the middle and upper troposphere, focusing on the measurements of weakly absorbing pollutants. For this specific biomass burning event, we report simultaneous observations of an unprecedented number of organic species. Measurements of C₂H₄ (ethene), C₃H₄ (propyne), H₂CO (formaldehyde), C₃H₆O (acetone) and CH₃COO₂NO₂ (peroxyacetylnitrate, abbreviated as PAN) are the first reported detections using infrared occultation spectroscopy from satellites. 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