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Coralie DE CLERCQ, Pierre GERARD, José GRANVILLE, and Jean-Christopher LAMBERT

SCIAMACHY Pointing Meeting, Bremen, 30 November 2006. Ground-based validation of SCIAMACHY OL 3.0 Ozone Profile Data and Estimation of Altitude Shift by Cross-correlation Method. Coralie DE CLERCQ, Pierre GERARD, José GRANVILLE, and Jean-Christopher LAMBERT

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Coralie DE CLERCQ, Pierre GERARD, José GRANVILLE, and Jean-Christopher LAMBERT

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  1. SCIAMACHY Pointing Meeting, Bremen, 30 November 2006 Ground-based validation of SCIAMACHY OL 3.0 Ozone Profile Data and Estimation of Altitude Shift by Cross-correlation Method Coralie DE CLERCQ, Pierre GERARD, José GRANVILLE, and Jean-Christopher LAMBERT Belgian Institute for Space Aeronomy (IASB-BIRA), Brussels

  2. OVERVIEW SCIAMACHY OL 3.0 LIMB OZONE PROFILES • DATA DESCRIPTION • METHODOLOGY • INDIVIDUAL OZONE PROFILE COMPARISONS • ALTITUDE SHIFT • TIME SERIES • VERTICAL STRUCTURES • CONCLUSION

  3. SCIAMACHY OL 3.0 LIMB OZONE PROFILES Limited data set retrieved at DLR NETWORKS OF GROUND-BASED INSTRUMENTS SCIAMACHY collocations with correlative data at : 12 ozonesonde stations 6 lidars DATA DESCRIPTION

  4. METHODOLOGY (I) Individual ozone profile comparisons Altitude Shift • Method of cross-correlation Time series • Identify time periods where statistical analysis is relevant Vertical structure • For homogeneous time periods

  5. Altitude pointing shift Majority : decreased altitude shift A few : shifted downward Paramaribo : shifted upward Ozone maximum SCIAMACHY reports lower ozone values. INDIVIDUAL OZONE PROFILE COMPARISONS

  6. De Clercq et al., ESA SP-572, 2005. ALTITUDE SHIFT (1) SCIAMACHY previous versions of limb O3P :

  7. ALTITUDE SHIFT (2) SCIAMACHY OL 3.0 Limb O3P : • Zonal Structure

  8. ALTITUDE SHIFT (3) SCIAMACHY 3.0 Limb O3P : • Meridian Structure • Mean altitude shift strongly reduced <1km (1.5to 3km for previous versions) • Zonal and meridian structures persist. • Profiles are suitable for preliminary validation.

  9. TIME SERIES

  10. VERTICAL STRUCTURES Good agreement within 10% level except : • Under-estimation of ozone maximum • Larger negative differences at Paramaribo (Remaining altitude shift problems?) • Underestimation around 40km in comparisons with lidar data

  11. CONCLUSION Ground-based analysis of SCIAMACHY limb ozone profile OL 3.0 • Collocations found with 12 O3S and 6 lidars Known altitude pointing problem : • Mean altitude shift < 1km (1.5 and 3km previously) • Zonal and meridian dependences of pointing error exist. • Profile are suitable for a preliminary validation Time series and vertical structures : • Mean relative difference often fits within the ±10% level, except: • Underestimation of ozone at its maximum • Larger negative differences with a maximum at Paramaribo (Remaining altitude shift problems?)

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