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-- Southern Hemisphere ADditional OZonesondes

An Archive of sub/tropical and remote ozonesonde data
Attention!! Ozonesonde Data Caveat!

  • 7 SHADOZ stations exhibit a 2-6% "drop-off" in total column ozone (TCO) beginning 2014-2016, depending on the station.

  • The ozonesonde community first documented this in Thompson et al. (2017; Figure 4) and Sterling et al. (2018; Figure 14). Click PAPERS link in banner for links to references.

  • Stauffer et al. (2020) documents this drop-off detected at some of the global ozonesonde stations. Analysis and tests by the ozonesonde community are ongoing and will be documented in a future publication.

  • Examples of satellite comparisons with an “Affected” station and “Unaffected” station (Tables below) are illustrated HERE. Comparisons with ground-based column instruments (Dobson, Brewer, SAOZ) are similar.

  • STATUS SUMMARY: V6 SHADOZ data, much improved over v5.2 data [Thompson et al., 2017; Witte et al., 2017; 2018], are recommended for model comparisons, climatology, satellite comparisons. For the “Affected” stations listed in Table (below), data above 40 hPa are not recommended for calculation of trends after the onset of "TCO drop".
    !! See tables below for affected stations (red) and unaffected stations (green)!!

  • Update 27 August 2021: Drop-offs in TCO are not getting any worse at the "affected" stations in recent datasets. Improving stations are marked with * in the "affected" table below. The dropoff appears to be a combination of an instrument artifact and station operating procedures, which the community is investigating. More updates to follow in a subsequent publication.

    SHADOZ map

    SHADOZ Stations Affected by Stratospheric & Total Column O3 (TCO) "Dropoff"
    Current Sites Max TCO Drop (%) "Drop-off" Start date Most Recent Profile
    Ascension Is., U.K.-3.92016-03-282021-11-17
    Costa Rica (currently San Pedro)-5.32015-10-022021-12-17
    Hilo, Hawaii-3.72015-08-262021-12-29
    Nairobi, Kenya*-3.02016-09-072019-12-31
    Pago Pago, Am. Samoa-3.02016-10-192021-12-23
    San Cristobal, Galapagos-4.72014-01-022016-01-07
    Suva, Fiji*-3.02017-05-302021-12-23

    SHADOZ Stations Unaffected by Stratospheric & Total Column O3 "Dropoff"
    Current Sites Most Recent Profile
    Hanoi, Vietnam2021-11-26
    Irene, S. Africa2022-08-10
    Kuala Lumpur, Malaysia2021-12-30
    La Réunion Is, France2020-12-15
    Natal, Brazil2021-12-09
    Paramaribo, Surinam2021-09-28
    Watukosek, Java, Indonesia2013-10-30


    Data Disclaimer:

    The data on this website are subject to revision and reprocessing. Check dates of creation to download the most current version. Contact the station PIs for questions concerning data techniques and quality.

    Access to SHADOZ data is free to the public. Whenever substantial use is made of their data, you accept that an offer of co-authorship will be made through personal contact. In all cases, an acknowledgement must be made to the data co-investigators and SHADOZ when these data are used in publication. Click here for a list of contact information on the SHADOZ station PI's

    SHADOZ reserves the right to limit access to the Data Archive and to alter or change the layout and content of the website.


    CITATION - If you use SHADOZ data please cite the following articles:
    • Witte, J.C., A. M. Thompson, H. G. J. Smit, M. Fujiwara, F. Posny, Gert J. R. Coetzee, ... F. R. da Silva (2017), First reprocessing of Southern Hemisphere ADditional OZonesondes (SHADOZ) profile records (1998-2015): 1. Methodology and evaluation, J. Geophys. Res. Atmos., 122, 6611-6636. https://doi.org/10.1002/2016JD026403.
    • Thompson, A. M., J. C. Witte, C., Sterling, A., Jordan, B. J., Johnson, S. J. Oltmans, ... Thiongo, K. (2017). First reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) ozone profiles (1998-2016): 2. Comparisons with satellites and ground-based instruments. Journal of Geophysical Research: Atmospheres, 122, 13,000-13,025. https://doi.org/10.1002/2017JD027406.
    • Witte, J. C., Thompson, A. M., Smit, H. G. J., Vömel, H., Posny, F., & Stübi, R. (2018). First reprocessing of Southern Hemisphere ADditional OZonesondes profile records: 3. Uncertainty in ozone profile and total column. Journal of Geophysical Research: Atmospheres, 123, 3243-3268. https://doi.org/10.1002/2017JD027791.
    • Sterling, C. W., B. J. Johnson, S. J., Oltmans, H. G. J. Smit, A., Jordan, P. D., Cullis, E. G., Hall, A. M., Thompson, and J. C. Witte (2017). Homogenizing and Estimating the Uncertainty in NOAA's Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde, Atmos. Meas. Tech. https://doi.org/10.5194/amt-2017-397.

    Former Sites Period
    Cotonou,Benin 2005-2007
    Malindi, Kenya 1999-2006
    Papeete, Tahiti 1998-1999

    SHADOZ Campaign Data
    SHADOZ-SAFARI/SAVE 2000 Sept 2000: Southern African Research Initiative / Southern Africa Validation of EOS - ozonesondes launched at the Lusaka, Zambian Meteorological Agency DATA
    Aerosols99 Atlantic Cruise Jan/Feb 1999: Daily ozonesonde launches were made, in transit, from the Atlantic to Indian Oceans DATA
    SHADOZ-INDOEX Jan-Mar 1999: Daily ozonesondes from the Kaashidhoo Observatory, Maldives (5N,73.5E) DATA
    PEM-TROPICS B/SOWER Feb-Mar 1999: Christmas Island ozonesondes DATA
    CR-AVE Panama ozonesondes July-Aug 2007 DATA