Index of /archive/Archive-NewFormat/OzoneSonde_1.0_1

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2020-01-14
==========

Attention! OzoneSonde Data Caveat!
==================================

- A number of global ozonesonde stations report a sharp "drop-off" in
  stratospheric & total column ozone (TCO) after ~2013-14

- 17 stations exhibit a 2-8% "drop-off" in total ozone beginning 2013-2016,
  depending on the station. This list is not necessarily comprehensive. More
  information will be posted as it becomes available

- The drop-off appears to be an instrument artifact, not easily understood,
  that ozonesonde PIs are investigating. Updates will be posted here

- STATUS SUMMARY: Recently re-evaluated data [Tarasick et al., 2016; Van Malderen et al., 2016; Thompson et al., 2017; 2019; Sterling et al., 2018; Witte et al., 2017; 2018; 2019], are recommended for model comparisons, climatology, satellite comparisons. For the "Affected" stations (listed in Table), data above 40 hPa are not recommended for calculation of trends after the onset of "TCO drop".

Station Name  | WOUDC Station ID | Latitude | Longitude | "Drop-off" Start date | TCO Drop (%)
--------------|------------------|----------|-----------|-----------------------|-------------
Alert         |              018 |    82.49 |    -62.34 |               2016-02 |         -3.6
Eureka        |              315 |    79.98 |    -85.94 |               2016-01 |         -2.4
Resolute      |              024 |    74.7  |    -94.96 |               2015-03 |         -4.4
Churchill     |              077 |    58.74 |    -94.07 |               2016-06 |         -7.5
Edmonton      |              021 |    53.54 |   -114.1  |               2016-08 |         -3.3
Kelowna       |              457 |    49.93 |   -119.4  |               2015-03 |         -4.4
Yarmouth      |              458 |    43.87 |    -66.11 |               2016-04 |         -8.2
Hanoi         |              330 |    21.01 |    105.8  |               2014-11 |         -2.6
Hilo          |              109 |    19.43 |   -155.04 |               2014-08 |         -3.0
Costa Rica    |              TBD |     9.94 |    -84.04 |               2016-01 |         -5.5
San Cristobal |              434 |    -0.92 |    -89.62 |               2013-08 |         -5.2
Nairobi       |              175 |    -1.27 |     36.8  |               2015-06 |         -2.2
Natal         |              219 |    -5.42 |    -35.38 |               2013-09 |         -2.7
Ascension     |              328 |    -7.58 |    -14.24 |               2016-03 |         -3.3
Samoa         |              191 |   -14.23 |   -170.56 |               2017-01 |         -3.1
Fiji          |              438 |   -17.13 |    178.4  |               2015-12 |         -4.0
Lauder        |              256 |   -45    |    169.68 |               2016-09 |         -2.2

Contact
-------

For more information contact:

David Tarasick: david.tarasick at canada.ca
Anne Thompson: anne.m.thompson at nasa.gov
Ryan Stauffer: ryan.m.stauffer at nasa.gov
Roeland Van Malderen: roeland at meteo.be

References
----------

Sterling, C. W., B. J. Johnson, S. J. Oltmans, H. G. J. Smit, A. F. Jordan, P. D. Cullis, E. G. Hall, A. M. Thompson, and J. C. Witte (2018), 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, https://doi.org/10.5194/amt-11-3661-2018.

Tarasick, D.W., J. Davies, H.G.J. Smit and S.J. Oltmans (2016), A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013, Atmos. Meas. Tech. 9, 195-214, https://doi.org/10.5194/amt-9-195-2016.

Thompson, A. M., Witte, J. C., Sterling, C. W., Jordan, A., Johnson, B. J., Oltmans, S. J., Fujiwara, M., Vömel, H., Allaart, M., Piters, A., Coetzee, G. J. R., Posny, F., Corrales, E.  Andres Diaz, J., Félix, F., Komala, N., Lai, N., Maata, M., Mani, F., Zainal, Z., Ogino, S.-Y., Paredes, F., Luiz Bezerra Penha, T., Raimundo da Silva, F., Sallons-Mitro, S., Selkirk, H. B., Schmidlin, F. J., Stuebi, R., Thiongo, K. (2017). First reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) Ozone Profiles (1998-2016). 2. Comparisons with satellites and ground-based instruments, J. Geophys. Res., 122, 13000-13025, https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JD027406.

Thompson, A.M., Smit, H.G.J., Witte, J.C., Stauffer, R.M., Johnson, B.J., Morris, G., von der Gathen, P., van Malderen, R., Davies, J., Piters, A., Allaart, M., Posny, F., Kivi, R., Cullis, P., Hoang Anh, N.T., Corrales, E., Machinini, T., da Silva, F.R., Paiman, G., Thiong'o, K., Zainal, Z., Brothers, G.B., Wolff, K.R., Nakano, T., Stübi, R., Romanens, G., Coetzee, G.J. R., Diaz, J.A., Mitro, S., Mohamad, M., and Ogino, S.Y. (2019), Ozonesonde quality assurance: The JOSIE-SHADOZ (2017) experience. Bull. Am. Met. Soc., 100(1), 155-171, https://journals.ametsoc.org/doi/full/10.1175/BAMS-D-17-0311.1.

Van Malderen, R., Allaart, M.A.F., De Backer, H., Smit, H.G.J., De Muer, D.: On instrumental errors and related correction strategies of ozonesondes: possible effect on calculated ozone trends for the nearby sites Uccle and De Bilt, Atmos. Meas. Tech., 9, 3793-3816, doi:10.5194/amt-9-3793-2016, 2016.

Witte, J. C., Thompson, A. M., Smit, H. G. J., Fujiwara, M., Posny, F., Coetzee, G. J. R., Northam, E. T. et al. (2017). First reprocessing of Southern Hemisphere ADditional OZonesondes (SHADOZ) profile records (1998-2015): 1. Methodology and evaluation. J. Geophys. Res.,  122(12), 6611-6636, https://doi.org/10.1002/2016JD026403.

Witte, J.C., A.M. Thompson, H.G.J. Smit, H. Vömel, F. Posny and R. Stübi (2018), First reprocessing of Southern Hemisphere ADditional OZonesondes profile records: 3. Uncertainty in ozone profile and total column. J. Geophys. Res., 123, 3243–3268. https://doi.org/10.1002/2017JD027791.

Witte, J.C., Thompson, A.M., Schmidlin, F.J., Northam, E.T., Wolff, K.R. and Brothers, G.B. (2019), The NASA Wallops Flight Facility digital ozonesonde record: Reprocessing, uncertainties, and dual launches. J. Geophys. Res.,124, 3565–3582. https://doi.org/10.1029/2018JD030098