Atmospheric Chemistry and Physics (Mar 2013)

Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer

  • R. A. Stachnik,
  • L. Millán,
  • R. Jarnot,
  • R. Monroe,
  • C. McLinden,
  • S. Kühl,
  • J. Puķīte,
  • M. Shiotani,
  • M. Suzuki,
  • Y. Kasai,
  • F. Goutail,
  • J. P. Pommereau,
  • M. Dorf,
  • K. Pfeilsticker

DOI
https://doi.org/10.5194/acp-13-3307-2013
Journal volume & issue
Vol. 13, no. 6
pp. 3307 – 3319

Abstract

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Measurements of mixing ratio profiles of stratospheric bromine monoxide (BrO) were made using observations of BrO rotational line emission at 650.179 GHz by a balloon-borne SIS (superconductor-insulator-superconductor) submillimeterwave heterodyne limb sounder (SLS). The balloon was launched from Ft. Sumner, New Mexico (34° N) on 22 September 2011. Peak mid-day BrO abundance varied from 16 ± 2 ppt at 34 km to 6 ± 4 ppt at 16 km. Corresponding estimates of total inorganic bromine (Bry), derived from BrO vmr (volume mixing ratio) using a photochemical box model, were 21 ± 3 ppt and 11 ± 5 ppt, respectively. Inferred Bry abundance exceeds that attributable solely to decomposition of long-lived methyl bromide and other halons, and is consistent with a contribution from bromine-containing very short lived substances, BryVSLS, of 4 ppt to 8 ppt. These results for BrO and Bry were compared with, and found to be in good agreement with, those of other recent balloon-borne and satellite instruments.