Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Bry

C. A. Mclinden 1 C. S. Haley 2 N. D. Lloyd 3 F. Hendrick 4 A. Rozanov 5 B.-M. Sinnhuber 5 Florence Goutail 6 D. A. Degenstein 3 E. J. Llewellyn 3 C. E. Sioris 1 M. van Roozendael 4 Jean-Pierre Pommereau 6 W. Lotz 5 J. P. Burrows 5
1 Air Quality Research Division [Toronto]
2 CRESS - Centre for Research in Earth and Space Science [Toronto]
3 ISAS - Institute of Space and Atmospheric Studies [Saskatoon]
4 BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique
5 IUP - Institute of Environmental Physics [Bremen]
6 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : A 7+ year (2001–2008) data set of stratospheric BrO profiles measured by the Optical Spectrograph and Infra-Red Imager System (OSIRIS) instrument, a UV-visible spectrometer measuring limb-scattered sunlight from the Odin satellite, is presented. Zonal mean radiance spectra are computed for each day and inverted to yield effective daily zonal mean BrO profiles from 16 to 36 km. A detailed description of the retrieval methodology and error analysis is presented. Single-profile precision and effective resolution are found to be about 30% and 3–5 km, respectively, throughout much of the retrieval range. Individual profile and monthly mean comparisons with ground-based, balloon, and satellite instruments are found to agree to about 30%. A BrO climatology is presented, and its morphology and correlation with NO2 is consistent with our current understanding of bromine chemistry. Monthly mean Bry maps are derived. Two methods of calculating total Bry in the stratosphere are used and suggest (21.0 ± 5.0) pptv with a contribution from very short lived substances of (5.0 ± 5.0) pptv, consistent with other recent estimates.
keyword : Bromine Limb scattering
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C. A. Mclinden, C. S. Haley, N. D. Lloyd, F. Hendrick, A. Rozanov, et al.. Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Bry. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2010, 115 (D15), pp.D15308. ⟨10.1029/2009JD012488⟩. ⟨hal-00509346⟩

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