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Andy Delcloo and Hugo De Backer

Homogeneity of the long term ozonesonde observation record in the troposphere and the stratosphere for Uccle. Andy Delcloo and Hugo De Backer. Ozonesonde. Ozone profiles Balloon soundings Brewer-Mast sondes 1969-1997 Z-ECC-sondes since April 1997 3 x week: Mo-We-Fri. Trends. Trends.

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Andy Delcloo and Hugo De Backer

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  1. Homogeneity of the long term ozonesonde observation record in the troposphere and the stratosphere for Uccle Andy Delcloo and Hugo De Backer Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

  2. Ozonesonde Ozone profiles Balloon soundings Brewer-Mast sondes 1969-1997 Z-ECC-sondes since April 1997 3 x week: Mo-We-Fri

  3. Trends

  4. Trends

  5. Pump efficiency Box temperature (taking into account) Changes from BM  ECC sondes Changes in pre-flight conditions Altitude error SO2 interference Background current… Standard correction <-> correction for temperature and pressure.  ftp.kmi.be/dist/meteo/hugo/publ/1999/o3prof.pdf Changes in the procedure to get to the best possible time series

  6. Standard <-> adapted correction Standard temperature Fixed pump correction Linear correction to correct for the total measured ozone column compared with the integrated total ozone column • Boxtemperature is measured if available • Pump correction is replaced by pressure dependent correction to correct for total ozone by using measured total ozone column data.

  7. Use of SAGE-II data Is a satellite which uses the principle of onion peeling Use of auto-calibration ! Important if you want to look for discontinuities in time series Time series used from 1985 – 1999 Change from BM  ECC 1997 Which procedure can we apply to check for inconsistencies?

  8. SAGE-II 26 _ 30 KM 26 _ 30 KM Using additional corrections Using WMO standard corrections

  9. What about the quality of tropospheric ozone ? Use of a chemical transport model: CHIMERE ECMWF (50 km) ERA-INTERIM

  10. CHIMERE simulation

  11. Cross-section O3-profile Uccle 5 km GL

  12. Capability of a CTM to catch vertical variability

  13. Capability of a CTM to catch vertical variability (1997 experiment)

  14. Integrated ozone profiles between 736 hPa and 541 hPa Ozone anmaly (%)

  15. Procedure • Run 20 years of CTM output on a regional scale to identify the evolution of the day-to-day variability for free tropospheric ozone. • Different scenarios for emissions • Is the model able to explain differences in lower free tropospheric ozone concentrations between the three European ozone sounding stations • Emissions • Dynamical effects (meteorology)

  16. Conclusions • Anomalies for the higher stratospheric ozone concentrations have succesfully been homogenised through the apllication of supplementary correction factors taking into account • Boxtemperature • Pressure dependent correction • Lower free tropospheric ozone concentrations will be verified with CTM output

  17. Ozone, UV and aerosol group UV Modelling Radiative transfer for UV-index forecast Utsteinen – Antarctica – Princes Elisabeth station

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