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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-1
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jan 2018

Research article | 30 Jan 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

OMI total bromine monoxide (OMBRO) data product: Algorithm, retrieval and measurement comparisons

Raid M. Suleiman1, Kelly Chance1, Xiong Liu1, Gonzalo González Abad1, Thomas P. Kurosu2, Francois Hendrick3, and Nicolas Theys3 Raid M. Suleiman et al.
  • 1Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
  • 2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  • 3Royal Belgian Institute for Space Aeronomy, Brussels, Belgium

Abstract. This paper presents the retrieval algorithm for the operational Ozone Monitoring Instrument (OMI) total bromine monoxide (BrO) data product (OMBRO) developed at the Smithsonian Astrophysical Observatory (SAO), and shows some validation with correlative measurements and retrieval results. The algorithm is based on direct nonlinear least squares fitting of radiances from the spectral range 319.0–347.5nm. Radiances are modeled from the solar irradiance, attenuated by contributions from BrO and interfering gases, and including rotational Raman scattering, additive and multiplicative closure polynomials, correction for Nyquist undersampling, and the average fitting residual spectrum. The retrieval uses albedo- and wavelength-dependent air mass factors (AMFs), which have been pre-computed using a single mostly stratospheric BrO profile. The BrO cross sections are multiplied by the wavelength- dependent AMFs before fitting so that the vertical column densities (VCDs) are retrieved directly. The fitting uncertainties of BrO VCDs typically vary between 4 and 7×1012moleculescm−2 (~10–20% of the measured BrO VCDs). The retrievals agree well with GOME-2 observations at simultaneous nadir overpasses and ground-based zenith-sky measurements at 25 Harestua, Norway, with mean biases less than 0.12±0.76×1013moleculescm−2 (3.2±16.3%). Global distribution and seasonal variation of OMI BrO are generally consistent with previous satellite observations. The retrievals show enhancement of BrO at US Great Salt Lake. It also shows significant BrO enhancement from the eruption of the Eyjafjallajökull volcano, although the BrO retrievals can be affected under high SO2 loading conditions by the sub-optimum choice of SO2 cross sections.

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