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Searching for OClO Signatures in Odin Limb Radiance Measurements with DOAS Technique

In this study from Odin Limb Workshop in Bremen, DOAS technique was utilized to analyze OClO signatures in limb radiance measurements. Results show clear OClO signatures, although ongoing work is required for quantitative results and further optimization of the DOAS algorithm. The study also focuses on validating DOAS ozone retrievals in the UV-Vis region, comparing different forward models, and assessing the discrepancies in ozone profiles. Future outlook emphasizes investigating sensitivity to reference spectrum choice and optimizing fitting range.

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Searching for OClO Signatures in Odin Limb Radiance Measurements with DOAS Technique

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  1. Search for OClO signatures from Odin limb radiance measurements using DOAS technique P.Krecl, J.Stegman, C.S.Haley, C.E.Sioris, D.P.Murtagh, S.Brohede, E.J.Llewellyn and the Odin Team Limb Workshop, Bremen

  2. DOAS parameters applied: O3 223K Voigt et al NO2 223K Voigt et al OClO 233K Kromminga et al BrO 223K Fleishman et al Ring 250K Chance et al Rayleigh Witt et al Reference spectrum: 63 co-added spectra TH>55km Spectral range: 348 – 382 nm, hw1e 0.48 nm Box-car smoothing: 25-pixel width Orbits: 2175 (Sept 16, 2002) and 2226 (Oct 1, 2002) Limb Workshop, Bremen

  3. Limb Workshop, Bremen

  4. Conclusions and outlook • Clear signatures of OClO found • But only qualitative results – ongoing work • Further optimisiation of DOAS algorithm still needed • Broad versus narrow spectral region? Limb Workshop, Bremen

  5. Toward validation of DOAS ozone retrievals in the UV-Vis region B. Karlsson, P.Krecl, J.Gumbel, J.Stegman, I.McDade,C.S.Haley Limb Workshop, Bremen

  6. Approach: • Retrieved ozone profiles (and sza, ssa) plugged in a FM to obtain limb spectra • Two FM compared: differences <5% • Slant column densities in DOAS sense retrieved • Apparent slant column densities compared Limb Workshop, Bremen

  7. Limb Workshop, Bremen

  8. Limb Workshop, Bremen

  9. Limb Workshop, Bremen

  10. Summary • Ozone DOAS retrievals 20-30% lower than the present Flittner product • Higher discrepancy for high ozone • No clear correlation with albedo, sza, • Sensitivity to the short wavelength limit of the fitting range Limb Workshop, Bremen

  11. Limb Workshop, Bremen

  12. Limb Workshop, Bremen

  13. Outlook • Investigate sensitivity to the choice of reference spectrum • Further optimise the fitting range • ….whatever more we learn here! Limb Workshop, Bremen

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