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Ozone production due to emissions from vegetation burning
Authors:Günter Helas  Jürgen Lobert  Dieter Scharffe  Luise Schäfer  Johann Goldammer  Jean Baudet  Brou Ahoua  Ayité-Lô Ajavon  Jean-Pierre Lacaux  Robert Delmas  Meinrat O. Andreae
Affiliation:(1) Biogeochemistry, Department, Max Planck Institute for Chemistry, PO Box 3060, D-55020 Mainz, Germany;(2) Present address: NOAA CMDL, Boulder, CO, USA;(3) Institute Physique de l'Atmosphère, Université Abidjan, Côte d'Ivoire;(4) INSET/Genie Chimique, Yamoussoukro, Côte d'Ivoire;(5) Centre de Recherche Atmosphérique de CNRS, Campistrous, F-65300 Lannemezan, France;(6) Laboratoire d'Aérologie, Université Paul Sabatier, F-31062 Toulouse, France
Abstract:Ozone has been observed in elevated concentrations by satellites over areas previously believed to be lsquobackgroundrsquo. There is meteorological evidence, that these ozone lsquoplumesrsquo found over the Atlantic Ocean originate from vegetation fires on the African continent.In a previous study (DECAFE-88), we have investigated ozone and assumed precursor compounds over African tropical forest regions. Our measurements revealed large photosmog layers at altitudes from 1.5 to 4 km. Both chemical and meteorological evidence point to savanna fires up to several thousand km upwind as sources.Here we describe ozone mixing ratios observed over western Africa and compare ozone production ratios from different field measurement campaigns related to vegetation burning. We find that air masses containing photosmog lsquoingredientsrsquo require several days to develop their oxidation potential, similar to what is known from air polluted by emissions from fossil fuel burning. Finally, we estimate the global ozone production due to vegetation fires and conclude that this source is comparable in strength to the stratospheric input.
Keywords:ozone production  pyrogenic pollutants  West Africa
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