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Accent-troposat 2 final workshop, 30 Sept. - 01 Oct. 2008, FMI Helsinki, Finland

Troposat-2. Atmospheric bromine monoxide retrieval from space and ground-based UV-visible observations Nicolas Theys, F. Hendrick, M. Van Roozendael Belgian Institute for Space Aeronomy (IASB-BIRA) Brussels. Accent-troposat 2 final workshop, 30 Sept. - 01 Oct. 2008, FMI Helsinki, Finland.

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Accent-troposat 2 final workshop, 30 Sept. - 01 Oct. 2008, FMI Helsinki, Finland

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  1. Troposat-2 Atmospheric bromine monoxide retrieval from space and ground-based UV-visible observations Nicolas Theys, F. Hendrick, M. Van Roozendael Belgian Institute for Space Aeronomy (IASB-BIRA) Brussels Accent-troposat 2 final workshop, 30 Sept. - 01 Oct. 2008, FMI Helsinki, Finland

  2. Acknowledgements to: • BIRA-IASB Univ. of Bremen • I. De Smedt - A. Rozanov & colleagues • Q. Errera, S. Chabrillat, F. Daerden • B. Dils • Univ. of Heidelberg NIWA • M. Dorf - P. Johnston • K. Pfeilsticker - K. Kreher • Univ. of Cambridge • - X. Yang

  3. Scientific activites within the AT-2 project (TG1) • 1. Development of techniques to retrieve BrO columns and profiles • from ground-based observations: - Harestua (60°N,11°E) - Observatoire de Haute-Provence (OHP; 44°N, 6°E) - Reunion Island (21°S, 55°E) • Lauder (45°S, 170°E) • 2. Satellite total BrO columns retrieval : scientific products • - GOME • SCIAMACHY • - (+GOME-2) • 3. Retrieval of tropospheric BrO columns: GOME, (+GOME-2). • 4. Modelisation of stratospheric BrO using BASCOE. • 5. Comparison between satellites, ground-based, balloon and modelled • BrO data sets.

  4. Overview • 1.Multi-year comparison of stratospheric BrO retrieved from • SCIAMACHY limb and GB observations • 2.Long-term trend of stratospheric BrO using GB observations • 3.Development of a stratospheric BrO climatology using the BASCOE • model – application to the retrieval of tropospheric BrO VCD from • GOME-2 (preliminary results) • 4.Volcanic BrO observed by GOME-2 during the Kasatochi eruption

  5. Comparison of strato. BrO retrieved from SCIAMACHY limb and GB observations Harestua 60°N • SCIAMACHY limb stratospheric BrO profiles retrieved at the IUP/ Univ. of Bremen (scientific product version 3.2) • 15-27 km BrO partial columns (altitude with high sensitivity to BrO profile for both instruments) • Reasonable agreement: relative difference < 11% standard deviat. in the 13-19% range • A small seasonal dependence in the relative difference between both data sets is observed OHP 44°N Lauder 45°S Hendrick et al., submitted to ACPD

  6. Long-term trend of stratospheric BrO using GB observations • Trend analysis including linear and seasonal components (polyharmonic functions). • Trend values at both stations agree whithin their combined error bars. • Indication that Montreal Protocol restrictions on brominated substances have now reached the stratosphere. Hendrick et al., GRL, 2008

  7. Development of a stratospheric BrO climatology using the BASCOE model • Motivation: retrieval of tropospheric BrO columns from • satellite nadir observations (GOME, SCIAMACHY, GOME-2) • → need to correct for the BrO absorption in the stratosphere • the impact of the atmospheric dynamics and the photochemistry on the stratospheric BrO distribution is accounted for by making use of O3 and stratospheric NO2 columns simultaneously measured by the satellite instrument. • the parameterization is based on the BACOE 3D-CTM which has been fully optimized for bromine chemistry and budget, and validated through comparisons using ground-based, balloon and SCIAMACHY limb observations. Theys et al., ACPD, 2008 12-20 km BrO partial columns 15-30 km BrO partial columns (zonal mean)

  8. Application to the retrieval of tropospheric BrO VCD from GOME-2 preliminary results September 2007(sza<80° & CF<0.4) Total VCD Tropospheric VCD Stratospheric VCD Tropospheric AMFs are calculated using BrO profiles from the pTOMCAT model

  9. Volcanic BrO observed by GOME-2 Kasatochi volcano (Alaska, 52.17°N, 175.51°W) massive eruption of 7th August 2008 - Strong indication of the direct injection of at least 25-35 tons of reactive bromine in the UT/LS! - Transport north-eastward by fast near-tropopause jet-winds paper in preparation - submission soon in GRL Initial condition: 1 kg of BrO in 10-12 km height layer

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