Andy Delcloo and Hugo De Backer

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Presentation transcript:

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 Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Ozonesonde Ozone profiles Balloon soundings Brewer-Mast sondes 1969-1997 Z-ECC-sondes since April 1997 3 x week: Mo-We-Fri Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 2

Trends Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Trends Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Changes in the procedure to get to the best possible time series 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 Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Standard <-> adapted correction 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. Standard temperature Fixed pump correction Linear correction to correct for the total measured ozone column compared with the integrated total ozone column

Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Which procedure can we apply to check for inconsistencies? 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 Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

SAGE-II 26 _ 30 KM 26 _ 30 KM Using additional corrections Using WMO standard corrections Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

What about the quality of tropospheric ozone ? Use of a chemical transport model: CHIMERE ECMWF (50 km) ERA-INTERIM Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 10

CHIMERE simulation Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 11

Cross-section O3-profile Uccle 5 km GL Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 12

Capability of a CTM to catch vertical variability Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 13

Capability of a CTM to catch vertical variability (1997 experiment) Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Integrated ozone profiles between 736 hPa and 541 hPa Ozone anmaly (%) Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 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) Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

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 Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011

Ozone, UV and aerosol group Utsteinen – Antarctica – Princes Elisabeth station Ozone, UV and aerosol group UV Modelling Radiative transfer for UV-index forecast Sparc/IOC/WMO-IGACO workshop on Past Changes in the Vertical Distribution of Ozone, Geneva, Januari 25-27 2011 18