1 / 13

Search for OClO signatures from Odin limb radiance measurements using DOAS technique

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. DOAS parameters applied:. O 3 223K Voigt et al NO 2 223K Voigt et al OClO 233K Kromminga et al

gerik
Download Presentation

Search for OClO signatures from Odin limb radiance measurements using DOAS technique

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related