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9th WMO/UNEP ORM Meeting, Geneva, 14-16.5.2014 National and Regional Reports – Region 6: Europe. Belgian contribution to ozone research and monitoring. Jean-Christopher Lambert Belgian Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium. Observations (1) – Ground-based.

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Belgian contribution to ozone research and monitoring

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belgian contribution to ozone research and monitoring

9th WMO/UNEP ORM Meeting, Geneva, 14-16.5.2014

National and Regional Reports – Region 6: Europe

Belgian contribution to ozone research and monitoring

Jean-Christopher Lambert

Belgian Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium

observations 1 ground based
Observations (1) – Ground-based


– Sustained contribution to GAW, NDACC, TCCON

  • Dobson #40 (since 1971)in Uccle, moved in 2009 to Kiev
  • Brewer #16 (since 1983) & Brewer #178 (since 2001) in Uccle
  • Brewer #100 (since 01/2011) at BelgianAntarctic Stat. Princess Elisabeth
  • ECC ozone soundings(since 1997) and Brewer-Mast archive (1969-1997)
  • Network of UV measurements over Belgium
  • FTIR spectrometer at the Jungfraujoch (sinceearly 1980s)

O3, NO2, HNO3, CO, CH4, N2O, HCl, ClONO2, HF, COF2, CCl2F2, CHClF2, CCl4…

  • DOAS UV-VIS spectrometers at the Jungfraujoch

O3, NO2 (since 1990) + BrO, H2O, HCHO, aerosols (since 2010)

  • DOAS UV-VIS spectrometers at Harestua (since 1994)

O3, NO2, BrO, OClO

  • DOAS UV-VIS spectrometers at OHP (since 1998)

O3, NO2, BrO, OClO, HCHO

  • FTIR spectrometer at Reunion Island (since 2002/2009, new CO/CO2 FTIR in 2010)

O3, NO2, HNO3, CO, CO2, CH4, N2O, HCl, ClONO2…

  • DOAS UV-VIS spectrometers at Reunion Island (2004-2005)

O3, NO2, BrO, HCHO

  • DOAS UV-VIS spectrometersin Bujumbura (since 2014)
observations total ozone trend at uccle
Observations: Total ozone trend at Uccle

De Backer et al., 2013

Figure 1: Running annual mean of total ozone (in Dobson Units)

from Dobson and Brewer spectrophotometers in Uccle, Belgium.

ozone trends from ndacc ftirs
Ozone trends from NDACC FTIRs
  • Vigouroux et al. (2008) provide total ozone trends from homogenized FTIR measurements in European stations, over the 1995–2004 period. These trends have been updated for the 1995–2009 period for the present Assessment and are summarized in Table 2-1. Because the time series are too short to employ the multi-regression models, a bootstrap resampling method was used, which allows for non-normally distributed data and gives an independent evaluation of the uncertainty in the trend value (Gardiner et al., 2008). The total column trends are close to zero and not significant at all stations except at Kiruna, where the trend is significantly positive.

Update for the WMO/UNEP Ozone Assessment 2014

observations uv radiation indices
Observations: UV radiation/indices

observations uv radiation indices1
Observations: UV radiation/indices

observations 2 satellites
Observations (2) – Satellites

Satellite measurements

  • Upcoming: TropOMI/S-5p, Sentinels 4 and 5, IASI-NG, others
  • Interest: O3, sources, reservoirs, GHG, aerosols, UV radiation


  • Mission advisory, instrumental development
  • Development of retrieval algorithms
  • Generation of level-2/3/4 data products (incl. DA)
  • Support to operationalisation and operations
  • Geophysical validation and QA monitoring
  • Scientific interpretation
  • International cooperation: CEOS, ESA, GMES/Copernicus, IO3C, NDACC, O3M-SAF etc.


  • Three instruments covering solar spectral irradiance from 17 nm to 100 μm (99% of solar energy)
    • SOLSPEC (SOLar SPECtral Irradiance measurements): 180 nm – 3 000 nm; developed by CNRS (France) in partnership with BIRA-IASB (Belgium) and LSW (Germany)
    • SOVIM (SOlar Variable and Irradiance Monitor): near-UV, visible and thermal (200 nm – 100 μm); developed by PMOD/WRC (Davos, Switzerland) with one instrument’s radiometers provided by IRM-KMI (Belgium)
    • SOL-ACES (SOLar Auto-Calibrating Extreme UV/UV Spectrophotometers): EUV/UV; developed by IPM (Germany)
  • Facility Support Centre: Belgian USOC at BIRA-IASB
support to ozone long term monitoring with european sensors
Support to Ozone Long-Term Monitoring with European Sensors









June 1995


~35 years

E39C-A (SCN-B2d), Stenke et al., ACP, 2009

GOME/SCIAMACHY/GOME-2, Loyola et al., IJRS Montreal Protocol special issue, 2009

column retrievals from metop a b gome 2

O3M-09 Offline Total Sulfur Dioxide OTO/SO2

O3M-08 Offline Bromine Monoxide OTO/BrO

Column retrievals from MetOp-A/B GOME-2
  • Framework: Support to O3M-SAF Continuous Development and Operations, for GOME-2 data product development and validation
  • Activities:
    • Develop state-of-the-art algorithms for trace gas retrievals from GOME-2, and support their integration into the operational processor at DLR-Oberpfaffenhofen
    • Assess consistency with other sensors (GOME, SCIAMACHY, OMI) and between GOME-2A and GOME-2B
    • Perform initial validation and routine monitoring of data products.
  • Data products:

UV-Vis nadir trace gases: O3, NO2, BrO, SO2, HCHO, CHOCHO…

iasi operational and science processing 1
IASI operational and science processing (1)

IASI species

IASI spectrum













H2O + Iso



Radiative transfer





Atmospheric chemistry





Local-to global atmospheric concentrations

iasi operational and science processing 2
IASI operational and science processing (2)

Figure 2: Five years' time series of ozone vmrs from IASI, looked at separately in the stratosphere, the UTLS and the troposphere (Wespes et al., in preparation)

contribution to esa cci ozone
Contribution to ESA CCI-Ozone

13 partners

Nadir profiles


Total ozone

multi mission consistency of ozone profilers esa cci prodex a3c sparc op3trends wmo o3s dqa
Multi-mission consistency of ozone profilersESA CCI / ProDEx A3C/ SPARC OP3trends / WMO O3S-DQA

(contributions to SI2N final meeting, Helsinki, Sept. 2013)


Dekemper et al., Applied Optics 2012

  • ALTIUS – Mission concept
  • UV-Vis-NIR spectral imager on-board a PROBA platform on Sun-synchronous LEO.
  • 3 modes : limbscattering + solar occultation + stellar occultation.
  • 3 independant spectral channelswith AOTF (TeO2 and KDP).
  • Target species : O3, NO2, CH4, H2O, BrO, PSC, aerosols,...
  • ALTIUS – Currentstatus
  • Now in Phase B1 towards PDR.
  • ALTIUS – Breadboarding
  • - Demonstration of spectral performance with NO2 (VIS) and O3 (UV).
  • - Spectral imaging.
  • - Instrument characterisation.
  • - Test case: Remotesensing of NO2emissionsfromincinerator
activities associated with 8orm recommendations
Activities associated with 8ORM recommendations
  • Observation of O3AND related species AND climate related species => O3, reactive gases, ODSs, ODS substitutes, GHGs, aerosols
  • QA of data => homogeneity survey of networks, establishment of validation protocols (for O3, AQ, GHG, GAS…), multi-mission validation of satellite data records (in climate change context)
  • Metadata => efforts to improve satellite and GB metadata, inclusion of information content (e.g. averaging kernels), improvement of generic metadata for atmospheric composition
  • Development of gap filling satellite mission ALTIUS; contribution to Sentinel-5 Precursor, Sentinel-4 and Sentinel-5
  • Reducing measurement uncertainty => BELSPO/ProDEx A3C, ESA QWGs, EUMETSAT O3M-SAF, ESA CCI-Ozone and CCI-GHG
  • Understand differences between data sets => field campaigns, ACSO, multi-dimensional observation operators…
  • Improved ozone cross-sections => ACSO: satellite retrieval studies
  • Increased level of collaboration between observational networks (and with satellite missions) => CEOS and NDACC sponsored campaigns, involvement in NDACC WGs, system engineering for the GMES/Copernicus Atmospheric Service, EU FP7 NORS