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Unexplained enhancements of CH3Br in the Arctic and sub-Arctic lower troposphere during TOPSE spring 2000

  • Author(s): Wingenter, OW
  • Sive, BC
  • Blake, DR
  • Rowland, FS
  • Ridley, BA
  • et al.

Elevated concentrations of methyl bromide (CH Br) were observed in the Arctic atmospheric boundary layer (BL) during periods of widespread BL ozone (O ) depletion episodes (ODEs: O mixing ratios < 20 × 10 or parts per billion by volume, ppbv) particularly during major ODEs (MODES: O < 4 ppbv). No other organic gases measured during TOPSE (Tropospheric Ozone Production about the Spring Equinox) exhibited anti-correlations with O during these ODEs. Methyl bromide has both natural and anthropogenic sources and contributes ∼ half of the bromine (Br) to the stratosphere, where it can catalytically destroy O . Several known CH Br sources are evaluated, but the current knowledge cannot explain the observed enhancements. If the mechanism is direct gasphase photochemical production, a significant portion of the unknown CH Br source may be found. 3 3 3 3 3 3 3 3 -9

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