Stratospheric BrO profiles measured at different latitudes and seasons: Instrument description, spectral analysis and profile retrieval

Details Stratospheric BrO profiles measured at different latitudes and seasons: Instrument description, spectral analysis and profile retrieval Stratospheric BrO profiles measured at different latitudes and seasons: Instrument description, spectral analysis and profile retrieval

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3847f&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 20, p. 3847-3850

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Atmospheric Composition And Structure

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Measurements of stratospheric BrO profiles are reported using a novel DOAS instrument (Differential Optical Absorption Spectrometry) operated on the LPMA/DOAS balloon gondola (LPMA/Laboratoire de Physique Moléculaire et Applications) during three flights (León, Nov. 23, 1996, Kiruna, Feb. 14, 1997, and Gap, June 20, 1997). BrO was detected by its vibrational bands (4-0 at 354.7 nm; 5-0 at 348.8 nm) of the A(2π)<-X(2π) transition in direct sunlight spectra from balloon ascent, descent and during solar occultation at maximum (float) altitude. We show that our accuracy is about +/-18% (1σ) during balloon ascent (solar zenith angles, SZA<88°), and about +/-25% for solar occultation measurements. For altitudes above the balloon float our observations indicate average BrO mixing ratios of (14.4+/-2.5)ppt, (15.6+/-2.8)ppt, and (15.3+/-2.8)ppt above 30.6 km, 30.0 km, and 39.8 km, respectively.

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