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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 4
Ann. Geophys., 20, 547–557, 2002
https://doi.org/10.5194/angeo-20-547-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 547–557, 2002
https://doi.org/10.5194/angeo-20-547-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Apr 2002

30 Apr 2002

Ozone generation over the Indian Ocean during the South African biomass-burning period: case study of October 1992.

F. G. Taupin2,1, M. Beekmann3, P. J. Brémaud1, and T. Randriambelo1 F. G. Taupin et al.
  • 1Laboratoire de physique de l’atmosphère, Université de la R´eunion, 97715 Saint-Denis messag cedex 9, France
  • 2Now at LPCE-CNRS, 45071 Orléans cedex 2, France
  • 3Service d’Aéronomie du CNRS, Université Pierre et Marie Curie, Paris, 75252 Paris Cedex 05, France
  • Correspondence to: F. G. Taupin (goffinon@cnrs-orleans.fr)

Abstract. In this study, we present an estimation of photochemical ozone production during free tropospheric transport between the African biomass burning area and Reunion Island (Indian Ocean) by means of trajectory-chemistry model calculations. Indeed, enhanced ozone concentrations (80–100 ppbv) between 5 and 8 km height over Reunion Island are encountered during September–October when African biomass burning is active. The measurements performed during flight 10 of the TRACE-A campaign (October 6, 1992) have been used to initialise the lagrangian trajectory-chemistry model and several chemical forward trajectories, which reach the area of Reunion Island some days later, are calculated. We show that the ozone burden already present in the middle and upper troposphere over Southern Africa, formed from biomass burning emissions, is further enhanced by photochemical production over the Indian Ocean at the rate of 2.5 - 3 ppbv/day. The paper presents sensitivity studies of how these photochemical ozone production rates depend on initial conditions. The rates are also compared to those obtained by other studies over the Atlantic Ocean. The importance of our results for the regional ozone budget over the Indian Ocean is briefly discussed.

Key words. Atmospheric composition and structure (evolution of the atmosphere; troposphere – composition and chemistry); meterorology and atmospheric dynamics (tropical meteorology)

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