Stratospheric BrO profiles measured at different latitudes and seasons: Atmospheric observations

Details Stratospheric BrO profiles measured at different latitudes and seasons: Atmospheric observations Stratospheric BrO profiles measured at different latitudes and seasons: Atmospheric observations

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3843h&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 20, p. 3843-3846

Physics

40

Atmospheric Composition And Structure

Scientific paper

Stratospheric BrO profiles were measured at different latitudes and in different seasons in 1996/97 during three flights of the LPMA/DOAS balloon gondola (LPMA/Laboratoire Physique Moléculaire et Application and DOAS/Differential Optical Absorption Spectrometry). Using direct sunlight DOAS spectrometry the following BrO mixing ratios were measured; (1) 9 to 14 ppt in the height range from 20 to 30 km (at solar zenith angles, SZA<88°) during ascent, (2) about (14+/-2) ppt for altitudes above the balloon float altitude at 30.6 km, 30.0 km, and 39.8 km, and (3) 5 to 10 ppt in the 20-30 km region during sunset. The lower BrO concentrations during sunset than those observed prior at daytime indicate a conversion of BrO into nighttime reservoir species (BrONO2, HOBr, and BrCl). The overall agreement of our UV spectroscopic BrO profiles with recent measurements using the chemical conversion/resonance fluorescence technique is good. Our BrO profiles are also in reasonable agreement with the present stratospheric Bry burden and chemistry. Conversily collocated ground-based and satellite column measurements, however, show significantly more total atmospheric BrO (50-100%) than the integrated stratospheric BrO balloon profiles can account for. This indicates a global tropospheric BrO background, estimated at 1-2 ppt.

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