Article Index

Validation Data

Correlative measurements used as reference for satellite validation are collected by ozonesondes operated in the framework of the Southern Hemisphere ADditional OZonesondes network (SHADOZ). Currently eleven SHADOZ stations provide reference data over the 20o S - 20o N belt over which the TROPOMI CCD data products are available.

SHADOZ network overlaid on TROPOMI 5-year median tropospheric ozone

Location of the eleven ozonesonde stations (red markers) contributing correlative measurements to the validation of Sentinel-5p. The background map shows the 5-year median tropospheric O3 column field (DU) as measured by TROPOMI between May 2018 and April 2023.


Correlative data are obtained via the following channels :

  • the SHADOZ data archive (Version 6, R.M. Stauffer, A.M. Thompson and D.E. Kollonige),
  • the rapid delivery data from the NOAA (B.J. Johnson) and KNMI (A. Piters) data archives,
  • the NDACC Data Host Facility, mirrored at EVDC and in BIRA-IASB's CORR-2 database for validation purposes.


  • Hubert, D. et al., TROPOMI tropospheric ozone column data: geophysical assessment and comparison to ozonesondes, GOME-2B and OMI, Atmos. Meas. Tech., 14, 7405–7433, doi:10.5194/amt-14-7405-2021, 2021.
  • Sterling, C. W. et al., Homogenizing and estimating the uncertainty in NOAA’s long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde, Atmos. Meas. Tech., 11, 3661–3687, doi:10.5194/amt-11-3661-2018, 2018.
  • Tarasick, D. W., et al., Improving ECC ozonesonde data quality: Assessment of current methods and outstanding issues, Earth Space Sci., 8, e2019EA000914. doi:10.1029/2019EA000914, 2021.
  • Thompson, A. M. et al., First reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) ozone profiles (1998–2016): 2. Comparisons with satellites and ground‐based instruments. J. Geophys. Res. Atmos., 122, 13,000-13,025, doi:10.1002/2017JD027406, 2017.
  • Thompson, A. M. et al., Ozonesonde Quality Assurance: The JOSIE–SHADOZ (2017) Experience, Bull. Am. Meteorol. Soc., 100, 155-171, doi:10.1175/BAMS-D-17-0311.1, 2019.
  • Witte, J. C. et al., First Reprocessing of Southern Hemisphere ADditional OZonesondes Profile Records: 3. Uncertainty in Ozone Profile and Total Column, J. Geophys. Res. Atmos., 123, 3243-3268, doi:10.1002/2017JD027791, 2018.