Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer

Abstract : Measurements of mixing ratio profiles of stratospheric bromine monoxide (BrO) were made using observations of BrO otational line emission at 650.179 GHz by a balloon-borne SIS (superconductor-insulator-superconductor) submillimeterwave heterodyne receiver. 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.
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Robert A. Stachnik, Luis Millán, Robert Jarnot, R. Monroe, C. Mclinden, et al.. Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer. Atmospheric Chemistry and Physics, European Geosciences Union, 2013, 13 (6), pp.3307-3319. ⟨10.5194/acp-13-3307-2013⟩. ⟨hal-00749250⟩

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