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Photochemical production of O3 in biomass burning plumes in the boundary layer over northern Australia

  • Author(s): Takegawa, N
  • Kondo, Y
  • Ko, M
  • Koike, M
  • Kita, K
  • Blake, DR
  • Hu, W
  • Scott, C
  • Kawakami, S
  • Miyazaki, Y
  • Russell-Smith, J
  • Ogawa, T
  • et al.
Abstract

In situ aircraft measurements of ozone (O3) and its precursors were made over northern Australia in August-September 1999 during the Biomass Burning and Lightning Experiment Phase B (BIBLE-B). A clear positive correlation of O3 with carbon monoxide (CO) was found in biomass burning plumes in the boundary layer (<3 km). The ΔO3/ΔCO ratio (linear regression slope of O3-CO correlation) is found to be 0.12 ppbv/ppbv, which is comparable to the ratio of 0.15 ppbv/ppbv observed at 0-4 km over the Amazon and Africa in previous studies. The net flux of O3 exported from northern Australia during BIBLE-B is estimated to be 0.3 Gmol O3/day. In the biomass burning region, large enhancements of O3 were coincident with the locations of biomass burning hot spots, suggesting that major O3 production occurred near fires (horizontal scale <50 km).

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